21st Century Human Habitat: Issues, Sustainability and Development
Utilization of Fly Ash in Road Construction in South Africa: Environmental Assessment
Low Cost Housing in Egypt by Using Stabilized Soil BricksIJCMESJOURNAL
Residential housing is one of the major priorities in Egypt. The cost of apartment in different regions can charge the person over budget money and per disability of people the slums appears with uncivilized environment. Construction material like cement consumes a lot of energy to produce final product which make an additional burden on state economy. This paper presents a simple technique to build low-cost housing by using new materials abundantly available in nature with low cost to improve sustainability and green energy. The compressive strength of compressed stabilized earth building bricks depends upon the soil type, amount of stabilizer and the compaction pressure used to form the bricks with dimension of 25x12x6cm. Experimental program was carried out on specimens and seven tests were applied. Each test consists of five masonry prisms assemblage cast with stabilized bricks. These tests are compressive strength, shear strength, in-plane tensile strength, and flexural tensile strength. The results are encouraging and promising to use these bricks in green constructions as low cost housing and national projects. A comparative study approved the cost effectiveness of using the stabilized bricks, as a load bearing wall system, instead of using the traditional skeleton structures by about 34% in case of one story building.
Mechanical Properties of Sustainable Adobe Bricks Stabilized With Recycled Su...IJERA Editor
In the pursuit of cheaper and more sustainable building materialsto meethousing demands in developing countries like Cameroun, the mechanicalproperties ofadobe bricks which have been stabilized with recycled sugarcane fiber waste were investigated. Laboratory experiments were conducted using sugarcanefiber waste stabilized adobe brick specimens with fiber proportions of 0%, 0.3%, 0.6%, 1.2%, 2% and 3% by weight.Fiber stabilization increased compressive strength by 58.61% for 3% bricks, reaching 4.79 MPa.Further, 3% fiber stabilized bricks shrunk by 7.49%, while the non-stabilized bricksshrunk by 12.13%. Also, 3% bricks lasted for one week before deterioration when immersed in water, while the non-stabilized bricks lasted for only a few hours. The findings confirmed that sugarcane fiber waste stabilized adobe bricks have improved strength, durability and stability. The use of abandoned sugarcane fiber waste in adobe bricks will contribute to the development of more durable, sustainable and stronger adobe brick structures, as well as reduce the environmental and economic challenges associated with the disposal of sugarcane waste.
Transportation access was important element on regional development which have
consequence on the environment degradation. This issues driving the land conversion,
an exploitation of natural resources and pollution. This research was conducted to
estimate the carbondioxides emission (CO2) on a road construction process. The data
collects with bottom up approaches from 16 locations of road construction in Central
Java which represents 2 pavement types (flexible and rigid). The GHG emission
estimated with a conversion of fuel consumption (IPCC Method). The estimation result
was analyze with a qualitative and quantitative method. An estimation generated the
CO2 emission of flexible pavement was 261,91 ton CO2 similar with 21,84 kgCO2/m3
while a rigid pavement produces 149,22 ton CO2 similar with 7,44 kgCO2/m3. The
manufacture process became a stages with largest contributor on the CO2 emission.
According to the result, a rigid pavement was an environmentally friendly method to
reduces GHG emission on road construction with a distribution stages plays an
important role as key categories.
Mechanical Strength of Concrete using Bottom Ash as Fine AggregateVISHNU VIJAYAN
Vishnu Vijayan, Achu V, Riyana M S ,Mechanical Strength of Concrete using Bottom Ash as Fine Aggregate, International Journal of Current Engineering And Scientific Research, April 2018, Volume 5, Issue 4, p-ISSN: 2393-8374,o-ISSN: 2394-0697; GICID: n/d; DOI: 10.21276/ijcesr.
Low Cost Housing in Egypt by Using Stabilized Soil BricksIJCMESJOURNAL
Residential housing is one of the major priorities in Egypt. The cost of apartment in different regions can charge the person over budget money and per disability of people the slums appears with uncivilized environment. Construction material like cement consumes a lot of energy to produce final product which make an additional burden on state economy. This paper presents a simple technique to build low-cost housing by using new materials abundantly available in nature with low cost to improve sustainability and green energy. The compressive strength of compressed stabilized earth building bricks depends upon the soil type, amount of stabilizer and the compaction pressure used to form the bricks with dimension of 25x12x6cm. Experimental program was carried out on specimens and seven tests were applied. Each test consists of five masonry prisms assemblage cast with stabilized bricks. These tests are compressive strength, shear strength, in-plane tensile strength, and flexural tensile strength. The results are encouraging and promising to use these bricks in green constructions as low cost housing and national projects. A comparative study approved the cost effectiveness of using the stabilized bricks, as a load bearing wall system, instead of using the traditional skeleton structures by about 34% in case of one story building.
Mechanical Properties of Sustainable Adobe Bricks Stabilized With Recycled Su...IJERA Editor
In the pursuit of cheaper and more sustainable building materialsto meethousing demands in developing countries like Cameroun, the mechanicalproperties ofadobe bricks which have been stabilized with recycled sugarcane fiber waste were investigated. Laboratory experiments were conducted using sugarcanefiber waste stabilized adobe brick specimens with fiber proportions of 0%, 0.3%, 0.6%, 1.2%, 2% and 3% by weight.Fiber stabilization increased compressive strength by 58.61% for 3% bricks, reaching 4.79 MPa.Further, 3% fiber stabilized bricks shrunk by 7.49%, while the non-stabilized bricksshrunk by 12.13%. Also, 3% bricks lasted for one week before deterioration when immersed in water, while the non-stabilized bricks lasted for only a few hours. The findings confirmed that sugarcane fiber waste stabilized adobe bricks have improved strength, durability and stability. The use of abandoned sugarcane fiber waste in adobe bricks will contribute to the development of more durable, sustainable and stronger adobe brick structures, as well as reduce the environmental and economic challenges associated with the disposal of sugarcane waste.
Transportation access was important element on regional development which have
consequence on the environment degradation. This issues driving the land conversion,
an exploitation of natural resources and pollution. This research was conducted to
estimate the carbondioxides emission (CO2) on a road construction process. The data
collects with bottom up approaches from 16 locations of road construction in Central
Java which represents 2 pavement types (flexible and rigid). The GHG emission
estimated with a conversion of fuel consumption (IPCC Method). The estimation result
was analyze with a qualitative and quantitative method. An estimation generated the
CO2 emission of flexible pavement was 261,91 ton CO2 similar with 21,84 kgCO2/m3
while a rigid pavement produces 149,22 ton CO2 similar with 7,44 kgCO2/m3. The
manufacture process became a stages with largest contributor on the CO2 emission.
According to the result, a rigid pavement was an environmentally friendly method to
reduces GHG emission on road construction with a distribution stages plays an
important role as key categories.
Mechanical Strength of Concrete using Bottom Ash as Fine AggregateVISHNU VIJAYAN
Vishnu Vijayan, Achu V, Riyana M S ,Mechanical Strength of Concrete using Bottom Ash as Fine Aggregate, International Journal of Current Engineering And Scientific Research, April 2018, Volume 5, Issue 4, p-ISSN: 2393-8374,o-ISSN: 2394-0697; GICID: n/d; DOI: 10.21276/ijcesr.
The International Journal of Engineering and Science (The IJES)theijes
The International Journal of Engineering & Science is aimed at providing a platform for researchers, engineers, scientists, or educators to publish their original research results, to exchange new ideas, to disseminate information in innovative designs, engineering experiences and technological skills. It is also the Journal's objective to promote engineering and technology education. All papers submitted to the Journal will be blind peer-reviewed. Only original articles will be published.
International Journal of Engineering Research and Applications (IJERA) is an open access online peer reviewed international journal that publishes research and review articles in the fields of Computer Science, Neural Networks, Electrical Engineering, Software Engineering, Information Technology, Mechanical Engineering, Chemical Engineering, Plastic Engineering, Food Technology, Textile Engineering, Nano Technology & science, Power Electronics, Electronics & Communication Engineering, Computational mathematics, Image processing, Civil Engineering, Structural Engineering, Environmental Engineering, VLSI Testing & Low Power VLSI Design etc.
When observing Egypt‟s method of expansion, one can identify a clear language and distinctive pattern of urban
development. The years following 1952, marked by the privatization of agricultural land and the population boom, gave rise to a soon
to be urban „catastrophe‟. In order to fulfil the needs of the growing population, buildings were sprouting out everywhere, causing
agricultural lands to disappear under a jungle of red bricks, erasing the lines between urban and rural. This phenomenon of informal
expansion has spread across the country composing what is commonly known as Ashwa’eeyat or informal settlements. In Egypt, these
can be identified by a unified method of construction using concrete skeleton structures of concrete slabs and beams along with plain
red brick walls; an appearance that does not reflect nor shed light on the Egyptian culture or environmental requirements. The use of
bricks and concrete is due to the fact that this construction method is the most commonly used and feasible type of construction; the
material is available, the workmanship, even though it is not the most economic method. Egypt is a developing country that possesses
numerous resources, being both tangible and intangible ones. The aim of this paper is to research and determine the possibility of
creating different elements of construction utilizing available resources and recycling waste material. These elements would be
economic and reflective of the Egyptian culture while maintaining the necessary environmental and physical safety requirements
sought in residential buildings.
IjcA CRITICAL EVALUATION ON POZZOLONIC PROPERTIES OF SELECTED MATERIALS AND T...IAEME Publication
Increase in population in the country is demanding more and more infrastructure projects and
housing which intern is demanding more and more cement manufacturing. This is resulting in
releasing of huge amount of CO2 into the atmosphere which is causing environmental problems.
There is a need to look for alternative materials which lessen emanation of green house gasses. As
a piece of this various alternative materials to cement have been explored by various researchers.
In the present study it is focused on basalt, fly ash, metakaolin, tank sediments, sludge of vitrified
ceramic tile plant, clayey soil and clay deposits. Published articles related to the pozzolonic
materials are collected and complied.
Most relevant papers are sorted out and studied in depth to understand the problems,
methodology, results obtained and conclusions drawn. Metakaolin was tried by several researchers
and it is found to be promising At Present metakaolin available in the market is costly and this cost
factor is one of the constraint in utilization, hence we need to explore alternative low cost materials
that can be used in the place of existing metakaolin after treatment.
URL: http://www.ejolt.org/2014/08/building-an-economy-on-quicksand/
'..Until recently sand was extracted in land quarries and riverbeds; however, these inland resources have nearly been depleted so that extraction has shifted to marine and coastal aggregates mining.'
Sand from deserts cannot be used for most purposes, as wind erosion over time forms round grains that do not bind well [4]. For most industrial uses, edged sand grains with a rough surface are needed, which stick together naturally. Desert sands, however, are usually fine- grained and of low shear strength –it does not even suit as material for the creation of artificial islands. Dubai, for example, used up all its suitable marine sand supplies for an artificial set of sand islands and, after these were exhausted, now has to import sand from Australia for continuing its building madness.
Most of the sand is by now extracted from the ocean floor – globally thousands of large boats are sucking up huge quantities of sand from the ocean floor in coastal areas like vacuum cleaners. As a result of currents, gravitation and movements of the waves, the gaps which were created by sand extraction are then filled by sand sliding in from surrounding areas and beaches. Due to this vicious cycle in Miami each year beaches have to be replenished with dredged-up sand to further provide tourists with its famous beaches.
In some extreme cases, the mining of marine aggregates has even changed international boundaries, such as through the disappearance of entire islands in Indonesia – since 2005 at least 24 small islands have disappeared as a result of erosion caused by illegal sand mining. Most of this sand is going to Singapore, which has expanded its surface area by 22% since the 1960s [5]. In response to this potentially heavy environmental toll many neighboring countries (Indonesia, Malaysia and Vietnam) have now banned exports of sand to Singapore, but this has only shifted the problem to countries such as Cambodia.
The conflicts caused by sand mining were for the first time brought to the attention of the general public through the documentary Sand Wars. Among many other outreach victories, the documentary inspired the United Nations Environment Programme (UNEP) to publish a Global Environmental Alert in March 2014 titled “Sand, rarer than one thinks”. In it, the authors state that “Formed by erosive processes over thousands of years, they [sand and gravel] are now being extracted at a rate far greater than their renewal”.
The International Journal of Engineering & Science is aimed at providing a platform for researchers, engineers, scientists, or educators to publish their original research results, to exchange new ideas, to disseminate information in innovative designs, engineering experiences and technological skills. It is also the Journal's objective to promote engineering and technology education. All papers submitted to the Journal will be blind peer-reviewed. Only original articles will be published.
The papers for publication in The International Journal of Engineering& Science are selected through rigorous peer reviews to ensure originality, timeliness, relevance, and readability.
International Journal of Engineering and Science Invention (IJESI)inventionjournals
International Journal of Engineering and Science Invention (IJESI) is an international journal intended for professionals and researchers in all fields of computer science and electronics. IJESI publishes research articles and reviews within the whole field Engineering Science and Technology, new teaching methods, assessment, validation and the impact of new technologies and it will continue to provide information on the latest trends and developments in this ever-expanding subject. The publications of papers are selected through double peer reviewed to ensure originality, relevance, and readability. The articles published in our journal can be accessed online.
All Level of government is yet to formulate legal practice of
sustainable extraction and uses of stone resources in only a few parts of
the Nepal, and there are few or no guidelines for the extraction and
uses of natural resources to follow. Nevertheless, the Stone industry
can independently utilize sustainable management techniques to
achieve the goals of meeting their needs for reserves without
compromising the ability of future generations to meet their needs.
This study includes the existing data and literature with laboratory testing for the suitability
of stone and stone byproducts for different infrastructure projects. The different quarry site of
Nepal has been identified by Department of Mines and Geology and Road Construction and
Maintenance Materials Study (RCMMS), Department of Road. For this, Kotre quarry site is
selected which is located at the boundary of Kaski and Tanahun district. As per the estimated
area of Kotre quarry is 921887.119 square meter. It is found that the quarry is recharged due
to the transportation of aggregate from Himalayan zone by flood in the monsoon season. The
properties of aggregate are tested for the quality of the aggregate and required properties is
fulfilling by this quarry.
Improvement of the Index and Compaction Characteristics of Black Cotton Soil ...Dr. Amarjeet Singh
The expansive soil obtained from Baure in Yamaltu Deba Local Government Area was rich in clay mineral (montmorillonite), unstable and difficult to use for construction purposes. The soil treated with up to 12% palm kernel shell ash (PKSA an agro – waste) by weight of dry soil to improve index properties and compaction characteristics of the soil using PKSA. Index tests were carried out to classify the natural soil, while the moisture-density relationships were determined by compaction tests on the natural and treated soils using three energy levels viz, British Standard light (BSL), West African Standard (WAS) and British Standard heavy (BSH). BCS used in the study was classified as A-7-5 (20) using the American Association of State Highway and Transportation Officials (AASHTO) and CH group in the Unified Soil Classification System (USCS). Tests results show that specific gravity of the soil increased from 2.29 for the natural to 2.34 at 12% treatment. Liquid limit decreased from 76.2% for natural to 73.4% at 10% PKSA content. Plastic limit increased from 40% for the natural soil to 47.1% at 12% PKSA content treatment. Maximum dry density (MDD) values decreased from 1.44Mg/m3, 1.5Mg/m3 and 1.65Mg/m3 for the natural soil to 1.38Mg/m3 at 10%, 1.45Mg/m3 at 10% and 1.56Mg/m3 at 6% PKSA content for BSL, WAS and BSH compaction energy levels respectively. On the other hand, optimum moisture content (OMC) value decreased from 28.5% and 22.4% for the natural soil to 22.4% and 21.0% at 12% PKSA content for BSL and WAS energies respectively while the value for BSH energy increased from 18.2% to 19.0% at 8% PKSA content. Results show that PKSA is suitable for the improvement of the index properties and compaction characteristics of BCS; and its beneficial use will reduce the attendant disposal problem on the environment.
Effect of CO2 sequestration on soil liquefaction in geological pitsijiert bestjournal
This paper deals with review of the previous related research on evaluation of soil liquefaction due to Carbon sequestration by various Carbon Capture Sequestration processes in geological pits. It provides critical literature recommendations on evaluation of soil liqu efaction potential assessment. The detection of soil liquefaction by using seismic records has been developed by various researchers. With this information,the evaluation of soil liquefaction are well under stood and this lead to a more precise and confident output. Gaining support for CCS will require engaging the interest and building the support of a variety of stakeholders,each with differ ent perspectives and goals. Although,CCS builds upon a technology base developed over more than half a century by the oil and gas industry. In the past,the industrially released CO 2 had been introduced to ocean which was harming the aquatic animals. In view of this,the sequestration of CO 2 into ocean was internationally banned. Hence,now much of the Carbon sequestration process is done by various industries in geolog ical pits. This creates a major threat to the earth quake problems worldwide. With the enhanced frequenc y of earthquakes all around the world,it is presumed by many environment scientists that the CO 2 sequestration pits leads to soil liquefaction and hence it results in more frequent earth quakes. T herefore,this paper summarises,different methods to evaluate liquefaction potential of soil by usi ng studies from seismic waves generated in earth,it is also propose it is also explains different me thodology for an eco friendly technology to reduce CO 2 from environment.
The International Journal of Engineering and Science (The IJES)theijes
The International Journal of Engineering & Science is aimed at providing a platform for researchers, engineers, scientists, or educators to publish their original research results, to exchange new ideas, to disseminate information in innovative designs, engineering experiences and technological skills. It is also the Journal's objective to promote engineering and technology education. All papers submitted to the Journal will be blind peer-reviewed. Only original articles will be published.
International Journal of Engineering Research and Applications (IJERA) is an open access online peer reviewed international journal that publishes research and review articles in the fields of Computer Science, Neural Networks, Electrical Engineering, Software Engineering, Information Technology, Mechanical Engineering, Chemical Engineering, Plastic Engineering, Food Technology, Textile Engineering, Nano Technology & science, Power Electronics, Electronics & Communication Engineering, Computational mathematics, Image processing, Civil Engineering, Structural Engineering, Environmental Engineering, VLSI Testing & Low Power VLSI Design etc.
When observing Egypt‟s method of expansion, one can identify a clear language and distinctive pattern of urban
development. The years following 1952, marked by the privatization of agricultural land and the population boom, gave rise to a soon
to be urban „catastrophe‟. In order to fulfil the needs of the growing population, buildings were sprouting out everywhere, causing
agricultural lands to disappear under a jungle of red bricks, erasing the lines between urban and rural. This phenomenon of informal
expansion has spread across the country composing what is commonly known as Ashwa’eeyat or informal settlements. In Egypt, these
can be identified by a unified method of construction using concrete skeleton structures of concrete slabs and beams along with plain
red brick walls; an appearance that does not reflect nor shed light on the Egyptian culture or environmental requirements. The use of
bricks and concrete is due to the fact that this construction method is the most commonly used and feasible type of construction; the
material is available, the workmanship, even though it is not the most economic method. Egypt is a developing country that possesses
numerous resources, being both tangible and intangible ones. The aim of this paper is to research and determine the possibility of
creating different elements of construction utilizing available resources and recycling waste material. These elements would be
economic and reflective of the Egyptian culture while maintaining the necessary environmental and physical safety requirements
sought in residential buildings.
IjcA CRITICAL EVALUATION ON POZZOLONIC PROPERTIES OF SELECTED MATERIALS AND T...IAEME Publication
Increase in population in the country is demanding more and more infrastructure projects and
housing which intern is demanding more and more cement manufacturing. This is resulting in
releasing of huge amount of CO2 into the atmosphere which is causing environmental problems.
There is a need to look for alternative materials which lessen emanation of green house gasses. As
a piece of this various alternative materials to cement have been explored by various researchers.
In the present study it is focused on basalt, fly ash, metakaolin, tank sediments, sludge of vitrified
ceramic tile plant, clayey soil and clay deposits. Published articles related to the pozzolonic
materials are collected and complied.
Most relevant papers are sorted out and studied in depth to understand the problems,
methodology, results obtained and conclusions drawn. Metakaolin was tried by several researchers
and it is found to be promising At Present metakaolin available in the market is costly and this cost
factor is one of the constraint in utilization, hence we need to explore alternative low cost materials
that can be used in the place of existing metakaolin after treatment.
URL: http://www.ejolt.org/2014/08/building-an-economy-on-quicksand/
'..Until recently sand was extracted in land quarries and riverbeds; however, these inland resources have nearly been depleted so that extraction has shifted to marine and coastal aggregates mining.'
Sand from deserts cannot be used for most purposes, as wind erosion over time forms round grains that do not bind well [4]. For most industrial uses, edged sand grains with a rough surface are needed, which stick together naturally. Desert sands, however, are usually fine- grained and of low shear strength –it does not even suit as material for the creation of artificial islands. Dubai, for example, used up all its suitable marine sand supplies for an artificial set of sand islands and, after these were exhausted, now has to import sand from Australia for continuing its building madness.
Most of the sand is by now extracted from the ocean floor – globally thousands of large boats are sucking up huge quantities of sand from the ocean floor in coastal areas like vacuum cleaners. As a result of currents, gravitation and movements of the waves, the gaps which were created by sand extraction are then filled by sand sliding in from surrounding areas and beaches. Due to this vicious cycle in Miami each year beaches have to be replenished with dredged-up sand to further provide tourists with its famous beaches.
In some extreme cases, the mining of marine aggregates has even changed international boundaries, such as through the disappearance of entire islands in Indonesia – since 2005 at least 24 small islands have disappeared as a result of erosion caused by illegal sand mining. Most of this sand is going to Singapore, which has expanded its surface area by 22% since the 1960s [5]. In response to this potentially heavy environmental toll many neighboring countries (Indonesia, Malaysia and Vietnam) have now banned exports of sand to Singapore, but this has only shifted the problem to countries such as Cambodia.
The conflicts caused by sand mining were for the first time brought to the attention of the general public through the documentary Sand Wars. Among many other outreach victories, the documentary inspired the United Nations Environment Programme (UNEP) to publish a Global Environmental Alert in March 2014 titled “Sand, rarer than one thinks”. In it, the authors state that “Formed by erosive processes over thousands of years, they [sand and gravel] are now being extracted at a rate far greater than their renewal”.
The International Journal of Engineering & Science is aimed at providing a platform for researchers, engineers, scientists, or educators to publish their original research results, to exchange new ideas, to disseminate information in innovative designs, engineering experiences and technological skills. It is also the Journal's objective to promote engineering and technology education. All papers submitted to the Journal will be blind peer-reviewed. Only original articles will be published.
The papers for publication in The International Journal of Engineering& Science are selected through rigorous peer reviews to ensure originality, timeliness, relevance, and readability.
International Journal of Engineering and Science Invention (IJESI)inventionjournals
International Journal of Engineering and Science Invention (IJESI) is an international journal intended for professionals and researchers in all fields of computer science and electronics. IJESI publishes research articles and reviews within the whole field Engineering Science and Technology, new teaching methods, assessment, validation and the impact of new technologies and it will continue to provide information on the latest trends and developments in this ever-expanding subject. The publications of papers are selected through double peer reviewed to ensure originality, relevance, and readability. The articles published in our journal can be accessed online.
All Level of government is yet to formulate legal practice of
sustainable extraction and uses of stone resources in only a few parts of
the Nepal, and there are few or no guidelines for the extraction and
uses of natural resources to follow. Nevertheless, the Stone industry
can independently utilize sustainable management techniques to
achieve the goals of meeting their needs for reserves without
compromising the ability of future generations to meet their needs.
This study includes the existing data and literature with laboratory testing for the suitability
of stone and stone byproducts for different infrastructure projects. The different quarry site of
Nepal has been identified by Department of Mines and Geology and Road Construction and
Maintenance Materials Study (RCMMS), Department of Road. For this, Kotre quarry site is
selected which is located at the boundary of Kaski and Tanahun district. As per the estimated
area of Kotre quarry is 921887.119 square meter. It is found that the quarry is recharged due
to the transportation of aggregate from Himalayan zone by flood in the monsoon season. The
properties of aggregate are tested for the quality of the aggregate and required properties is
fulfilling by this quarry.
Improvement of the Index and Compaction Characteristics of Black Cotton Soil ...Dr. Amarjeet Singh
The expansive soil obtained from Baure in Yamaltu Deba Local Government Area was rich in clay mineral (montmorillonite), unstable and difficult to use for construction purposes. The soil treated with up to 12% palm kernel shell ash (PKSA an agro – waste) by weight of dry soil to improve index properties and compaction characteristics of the soil using PKSA. Index tests were carried out to classify the natural soil, while the moisture-density relationships were determined by compaction tests on the natural and treated soils using three energy levels viz, British Standard light (BSL), West African Standard (WAS) and British Standard heavy (BSH). BCS used in the study was classified as A-7-5 (20) using the American Association of State Highway and Transportation Officials (AASHTO) and CH group in the Unified Soil Classification System (USCS). Tests results show that specific gravity of the soil increased from 2.29 for the natural to 2.34 at 12% treatment. Liquid limit decreased from 76.2% for natural to 73.4% at 10% PKSA content. Plastic limit increased from 40% for the natural soil to 47.1% at 12% PKSA content treatment. Maximum dry density (MDD) values decreased from 1.44Mg/m3, 1.5Mg/m3 and 1.65Mg/m3 for the natural soil to 1.38Mg/m3 at 10%, 1.45Mg/m3 at 10% and 1.56Mg/m3 at 6% PKSA content for BSL, WAS and BSH compaction energy levels respectively. On the other hand, optimum moisture content (OMC) value decreased from 28.5% and 22.4% for the natural soil to 22.4% and 21.0% at 12% PKSA content for BSL and WAS energies respectively while the value for BSH energy increased from 18.2% to 19.0% at 8% PKSA content. Results show that PKSA is suitable for the improvement of the index properties and compaction characteristics of BCS; and its beneficial use will reduce the attendant disposal problem on the environment.
Effect of CO2 sequestration on soil liquefaction in geological pitsijiert bestjournal
This paper deals with review of the previous related research on evaluation of soil liquefaction due to Carbon sequestration by various Carbon Capture Sequestration processes in geological pits. It provides critical literature recommendations on evaluation of soil liqu efaction potential assessment. The detection of soil liquefaction by using seismic records has been developed by various researchers. With this information,the evaluation of soil liquefaction are well under stood and this lead to a more precise and confident output. Gaining support for CCS will require engaging the interest and building the support of a variety of stakeholders,each with differ ent perspectives and goals. Although,CCS builds upon a technology base developed over more than half a century by the oil and gas industry. In the past,the industrially released CO 2 had been introduced to ocean which was harming the aquatic animals. In view of this,the sequestration of CO 2 into ocean was internationally banned. Hence,now much of the Carbon sequestration process is done by various industries in geolog ical pits. This creates a major threat to the earth quake problems worldwide. With the enhanced frequenc y of earthquakes all around the world,it is presumed by many environment scientists that the CO 2 sequestration pits leads to soil liquefaction and hence it results in more frequent earth quakes. T herefore,this paper summarises,different methods to evaluate liquefaction potential of soil by usi ng studies from seismic waves generated in earth,it is also propose it is also explains different me thodology for an eco friendly technology to reduce CO 2 from environment.
Our Budget Summary is now available and provides a detailed breakdown of all of the key measures included in Wednesday’s Budget, as well as highlighting other measures announced in earlier Budgets which come into play from 6 April 2017.
Digitize It Yourself: A Method of In-House Digitization
Amanda M. Shepp, Library Director, Marion H. Skidmore Library, Lily Dale Assembly, Lily Dale, NY (Population served: 2000)
Big Talk From Small Libraries 2017
February 24, 2017
http://nlcblogs.nebraska.gov/bigtalk/
El Técnico Medio en Asistencia Gerencial es un profesional capaz de desarrollar un conjunto de competencias que le permitan realizar actividades y cumplir roles relacionados con los elementos del área empresarial organizacional, aplicando los conocimientos básicos en su desempeño laboral con clientes, compañeros de trabajo, superiores, entre otros.
قازانج و خراپییەکانی کۆنکریت
Concrete is a composite material composed of coarse aggregate bonded together with a fluid cement that hardens over time. Most concretes used are lime-based concretes such as Portland cement concrete or concretes made with other hydraulic cements, such as ciment fondu. However, asphalt concrete, which is frequently used for road surfaces, is also a type of concrete, where the cement material is bitumen, and polymer concretes are sometimes used where the cementing material is a polymer.
When aggregate is mixed together with dry Portland cement and water, the mixture forms a fluid mass that is easily molded into shape. The cement reacts chemically with the water and other ingredients to form a hard matrix that binds the materials together into a durable stone-like material that has many uses.[2] Often, additives (such as pozzolans or superplasticizers) are included in the mixture to improve the physical properties of the wet mix or the finished material. Most concrete is poured with reinforcing materials (such as rebar) embedded to provide tensile strength, yielding reinforced concrete.
Famous concrete structures include the Hoover Dam, the Panama Canal, and the Roman Pantheon. The earliest large-scale users of concrete technology were the ancient Romans, and concrete was widely used in the Roman Empire. The Colosseum in Rome was built largely of concrete, and the concrete dome of the Pantheon is the world's largest unreinforced concrete dome.[3] Today, large concrete structures (for example, dams and multi-storey car parks) are usually made with reinforced concrete.
After the Roman Empire collapsed, use of concrete became rare until the technology was redeveloped in the mid-18th century. Today, concrete is the most widely used man-made material (measured by tonnage).
Effects of alternative ecological fillers on the mechanical, durability, and ...Publ 2022
In this research, the performance of fly ash/GGBS geopolymer mortars made with different quarry waste powder as filler materials by substituted the river sand fine aggregate with different ratios was evaluated based on the mechanical, physical, durability properties and microstructural analysis. Limestone waste, marble waste and basalt waste powder were used as filler materials developing eco-friendly and economical geopolymer from industrial waste as a promising sustainable area of research. A series of tests were conducted such as on strength properties, ultrasonic pulse vel-ocity (UPV), physical properties, abrasion resistance test, splitting tensile strength and microstructure analysis (SEM). The samples were elevated at the high-temperatures of 200 C, 400 C, 600 C and 800 C. Results conducted that the use of limestone waste powder and marble waste powder up to 50% ratio improved the geopolymer composite’s strength. The three filler geopolymer composites positively affected water absorption, strength properties and abrasion ratio results. The current article’s finding has indicated a potential solution, presenting another geopolymer class followed by the successful use of fly ash and quarry waste as significant asset materials. The output of this study is commercially expected to be effective intercession for waste recycled and friendly environmental management conclusions.
Study Of Strenth Charataristic Of Black Cotton Stablizing With Fly Ash And Ri...ijceronline
International Journal of Computational Engineering Research (IJCER) is dedicated to protecting personal information and will make every reasonable effort to handle collected information appropriately. All information collected, as well as related requests, will be handled as carefully and efficiently as possible in accordance with IJCER standards for integrity and objectivity.
Study Of Strenth Charataristic Of Black Cotton Stablizing With Fly Ash And Ri...ijceronline
International Journal of Computational Engineering Research (IJCER) is dedicated to protecting personal information and will make every reasonable effort to handle collected information appropriately. All information collected, as well as related requests, will be handled as carefully and efficiently as possible in accordance with IJCER standards for integrity and objectivity.
Partially Replacement of Clay by S.T.P. Sludge in Brick ManufacturingAM Publications
In many countries, sludge is a serious problem due to its high treatment costs and the risks to environment and human health. The sludge presents increasingly difficult problem to cities of all sizes because of the scarcity of suitable disposal sites, increasing labour costs, and environmental concerns. The study investigated the use of water treatment sludge incorporated with clay. In this study bricks were produced with sewage sludge additions ranging from 20, 25, 30 and 40% by dry weight respectively and compare produce brick with regular brick. Bricks with a sludge content of up to 40 % were capable of meeting the relevant technical standards. However, if bricks with more than 30 % sludge addition are not recommended for use because they are brittle in nature and easily broken even when handled gently as well as colour is not as per the requirement. Also from this investigation me can solve disposal problem completely and also construct and economical structure with easy designing.
Performance evaluation of locally available soil mixed with Fly ash and rando...IOSR Journals
In India, transportation is mainly by roads. Very small villages, remote areas and hilly areas can be accessed only by roads. Hence considerable attention is required towards the widening of roads, their stability and periodic repair works. Most state highways in the central part of India have problems of foundation due to presence of highly compressible clayey soils like black cotton soil. Black cotton soil is an expansive soil, which swells or shrinks excessively due to change in moisture content. When black cotton soil is associated with an engineering structure, it experiences either settlement or heave depending on the stress level and the soil swelling pressure. Design and construction of civil engineering structures on and with expansive soils is a challenging task for engineers. The present work is aimed to assess the improvement in the strength and stability characteristics in soft Subgrade soil by using the fly ash for the stabilization and then Nylon fibre as reinforcing material. Randomly distributed fibre reinforced soil (RDFRS) technique is used to prepare the reinforced soil samples. In RDFRS technique the mixing of reinforcement in the soil is very easy and no special skill is required. The reinforcement is added by percentage of the weight of the soil sample and by following certain aspect ratio i.e., length/diameter (L/D) ratio. Attempt is made to determine optimum combination of fly ash and fiber content for maximum gain in strength.
A Comparative Study of using Fly Ash and Rice Husk Ash in Soil Stabilizationijtsrd
Soils are generally stabilized to increase their strength and durability or to prevent erosion and dust formation in soils. The main aim is the creation of a soil material or system that will hold under the design use conditions and for the designed life of the engineering project. In this study, Stabilization of soil using solid wastes like Rice husk Ash and Fly ash which reduces the cost of chemical stabilization a review is made on Rice husk ash and Fly ash. RHA has rich amount of silica and FA believed to be one of the best pozzolans which may be used as chemical stabilizers for soil stabilization. The rice husk ash and fly ash is mixed in various proportions with soil like 5 , 10 , 15 and 20 . Various tests were also conducted on these mixes in order to find optimum proportions. Alok Kumar Chaudhary | Puspendra Kushwaha "A Comparative Study of using Fly Ash and Rice Husk Ash in Soil Stabilization" Published in International Journal of Trend in Scientific Research and Development (ijtsrd), ISSN: 2456-6470, Volume-6 | Issue-6 , October 2022, URL: https://www.ijtsrd.com/papers/ijtsrd52005.pdf Paper URL: https://www.ijtsrd.com/engineering/civil-engineering/52005/a-comparative-study-of-using-fly-ash-and-rice-husk-ash-in-soil-stabilization/alok-kumar-chaudhary
Water scarcity is the lack of fresh water resources to meet the standard water demand. There are two type of water scarcity. One is physical. The other is economic water scarcity.
Courier management system project report.pdfKamal Acharya
It is now-a-days very important for the people to send or receive articles like imported furniture, electronic items, gifts, business goods and the like. People depend vastly on different transport systems which mostly use the manual way of receiving and delivering the articles. There is no way to track the articles till they are received and there is no way to let the customer know what happened in transit, once he booked some articles. In such a situation, we need a system which completely computerizes the cargo activities including time to time tracking of the articles sent. This need is fulfilled by Courier Management System software which is online software for the cargo management people that enables them to receive the goods from a source and send them to a required destination and track their status from time to time.
Automobile Management System Project Report.pdfKamal Acharya
The proposed project is developed to manage the automobile in the automobile dealer company. The main module in this project is login, automobile management, customer management, sales, complaints and reports. The first module is the login. The automobile showroom owner should login to the project for usage. The username and password are verified and if it is correct, next form opens. If the username and password are not correct, it shows the error message.
When a customer search for a automobile, if the automobile is available, they will be taken to a page that shows the details of the automobile including automobile name, automobile ID, quantity, price etc. “Automobile Management System” is useful for maintaining automobiles, customers effectively and hence helps for establishing good relation between customer and automobile organization. It contains various customized modules for effectively maintaining automobiles and stock information accurately and safely.
When the automobile is sold to the customer, stock will be reduced automatically. When a new purchase is made, stock will be increased automatically. While selecting automobiles for sale, the proposed software will automatically check for total number of available stock of that particular item, if the total stock of that particular item is less than 5, software will notify the user to purchase the particular item.
Also when the user tries to sale items which are not in stock, the system will prompt the user that the stock is not enough. Customers of this system can search for a automobile; can purchase a automobile easily by selecting fast. On the other hand the stock of automobiles can be maintained perfectly by the automobile shop manager overcoming the drawbacks of existing system.
Explore the innovative world of trenchless pipe repair with our comprehensive guide, "The Benefits and Techniques of Trenchless Pipe Repair." This document delves into the modern methods of repairing underground pipes without the need for extensive excavation, highlighting the numerous advantages and the latest techniques used in the industry.
Learn about the cost savings, reduced environmental impact, and minimal disruption associated with trenchless technology. Discover detailed explanations of popular techniques such as pipe bursting, cured-in-place pipe (CIPP) lining, and directional drilling. Understand how these methods can be applied to various types of infrastructure, from residential plumbing to large-scale municipal systems.
Ideal for homeowners, contractors, engineers, and anyone interested in modern plumbing solutions, this guide provides valuable insights into why trenchless pipe repair is becoming the preferred choice for pipe rehabilitation. Stay informed about the latest advancements and best practices in the field.
COLLEGE BUS MANAGEMENT SYSTEM PROJECT REPORT.pdfKamal Acharya
The College Bus Management system is completely developed by Visual Basic .NET Version. The application is connect with most secured database language MS SQL Server. The application is develop by using best combination of front-end and back-end languages. The application is totally design like flat user interface. This flat user interface is more attractive user interface in 2017. The application is gives more important to the system functionality. The application is to manage the student’s details, driver’s details, bus details, bus route details, bus fees details and more. The application has only one unit for admin. The admin can manage the entire application. The admin can login into the application by using username and password of the admin. The application is develop for big and small colleges. It is more user friendly for non-computer person. Even they can easily learn how to manage the application within hours. The application is more secure by the admin. The system will give an effective output for the VB.Net and SQL Server given as input to the system. The compiled java program given as input to the system, after scanning the program will generate different reports. The application generates the report for users. The admin can view and download the report of the data. The application deliver the excel format reports. Because, excel formatted reports is very easy to understand the income and expense of the college bus. This application is mainly develop for windows operating system users. In 2017, 73% of people enterprises are using windows operating system. So the application will easily install for all the windows operating system users. The application-developed size is very low. The application consumes very low space in disk. Therefore, the user can allocate very minimum local disk space for this application.
Student information management system project report ii.pdfKamal Acharya
Our project explains about the student management. This project mainly explains the various actions related to student details. This project shows some ease in adding, editing and deleting the student details. It also provides a less time consuming process for viewing, adding, editing and deleting the marks of the students.
About
Indigenized remote control interface card suitable for MAFI system CCR equipment. Compatible for IDM8000 CCR. Backplane mounted serial and TCP/Ethernet communication module for CCR remote access. IDM 8000 CCR remote control on serial and TCP protocol.
• Remote control: Parallel or serial interface.
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• Compatible with commercial and Defence aviation CCR system.
• Remote control system for accessing CCR and allied system over serial or TCP.
• Indigenized local Support/presence in India.
• Easy in configuration using DIP switches.
Technical Specifications
Indigenized remote control interface card suitable for MAFI system CCR equipment. Compatible for IDM8000 CCR. Backplane mounted serial and TCP/Ethernet communication module for CCR remote access. IDM 8000 CCR remote control on serial and TCP protocol.
Key Features
Indigenized remote control interface card suitable for MAFI system CCR equipment. Compatible for IDM8000 CCR. Backplane mounted serial and TCP/Ethernet communication module for CCR remote access. IDM 8000 CCR remote control on serial and TCP protocol.
• Remote control: Parallel or serial interface
• Compatible with MAFI CCR system
• Copatiable with IDM8000 CCR
• Compatible with Backplane mount serial communication.
• Compatible with commercial and Defence aviation CCR system.
• Remote control system for accessing CCR and allied system over serial or TCP.
• Indigenized local Support/presence in India.
Application
• Remote control: Parallel or serial interface.
• Compatible with MAFI CCR system.
• Compatible with IDM8000 CCR.
• Compatible with Backplane mount serial communication.
• Compatible with commercial and Defence aviation CCR system.
• Remote control system for accessing CCR and allied system over serial or TCP.
• Indigenized local Support/presence in India.
• Easy in configuration using DIP switches.
Immunizing Image Classifiers Against Localized Adversary Attacksgerogepatton
This paper addresses the vulnerability of deep learning models, particularly convolutional neural networks
(CNN)s, to adversarial attacks and presents a proactive training technique designed to counter them. We
introduce a novel volumization algorithm, which transforms 2D images into 3D volumetric representations.
When combined with 3D convolution and deep curriculum learning optimization (CLO), itsignificantly improves
the immunity of models against localized universal attacks by up to 40%. We evaluate our proposed approach
using contemporary CNN architectures and the modified Canadian Institute for Advanced Research (CIFAR-10
and CIFAR-100) and ImageNet Large Scale Visual Recognition Challenge (ILSVRC12) datasets, showcasing
accuracy improvements over previous techniques. The results indicate that the combination of the volumetric
input and curriculum learning holds significant promise for mitigating adversarial attacks without necessitating
adversary training.
Quality defects in TMT Bars, Possible causes and Potential Solutions.PrashantGoswami42
Maintaining high-quality standards in the production of TMT bars is crucial for ensuring structural integrity in construction. Addressing common defects through careful monitoring, standardized processes, and advanced technology can significantly improve the quality of TMT bars. Continuous training and adherence to quality control measures will also play a pivotal role in minimizing these defects.
Welcome to WIPAC Monthly the magazine brought to you by the LinkedIn Group Water Industry Process Automation & Control.
In this month's edition, along with this month's industry news to celebrate the 13 years since the group was created we have articles including
A case study of the used of Advanced Process Control at the Wastewater Treatment works at Lleida in Spain
A look back on an article on smart wastewater networks in order to see how the industry has measured up in the interim around the adoption of Digital Transformation in the Water Industry.
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Forklift Classes Overview by Intella PartsIntella Parts
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1. 21st Century Human Habitat: Issues, Sustainability and Development 426
Heyns, M. W., Adedeji, J. A. & Mostafa H. M. (2016). Utilization of Fly Ash in Road Construction in South Africa: Environmental Assessment.
In Ebohon, O. J., Ayeni, D. A, Egbu, C. O, and Omole, F. K. Procs. of the Joint International Conference (JIC) on 21st Century Human Habitat:
Issues, Sustainability and Development, 21-24 March 2016, Akure, Nigeria, page number 426-432
Utilization of Fly Ash in Road Construction in South Africa: Environmental Assessment
Heyns, Michiel W1
, Adedeji, Jacob Adedayo2
& Mostafa Hassan, Mohamed3*
1,2&3
SURT Research group, Civil Engineering Department, Central University of Technology, South Africa
1
michiel.heyns@gmail.com. 2
jadedeji@cut.ac.za. 3
mmostafa@cut.ac.za
ABSTRACT
Using fly ash as alterative material in place of conventional materials is continually gaining
interest over decades. This results from its international recognition as non-hazardous construction
material. However, fly ash composition varies and thus it cannot be generalized that every fly ash
is non-hazardous. In South Africa, fly ash is produced in large quantity, yet its utilization on
annual basis remains at 6 percent which is majorly utilized in cement and concrete production.
Thus, this study focuses on investigating leaching of major elements in South Africa Class F fly
ash when used as a stabilizer in road construction. Three different specimens of fly ashes, namely;
Kendal Dump Ash, Durapozz and Pozzfill enhanced with different cements were used as
stabilizer for G5 soil use in road construction. Using an X-Ray spectrometry analyser the samples
were tested for any possible leach elements. Leach tests results show that fly ash enhanced with
cement as soil stabilizer in road construction is not harmful as the fly ash constituents‘ exhibit
limited mobility. However, results also indicated that fly ash left in dump sites can be harmful, if
some of the leached elements find their way to the ground water. Thus, utilization of fly ash for
road construction is an environmental sustainable option and has engineering advantages when
properly used for soil stabilization.
Keywords: Class F fly ash, drinking water, leach tests, pavement materials, and soil stabilization
INTRODUCTION
Material Shift
Material selection for pavement design is based on a combination of suitable materials,
environmental consideration, construction methods, economics and previous experience
(Bureau for Industrial Cooperation, 2012). Previously, road construction had depended
mainly on the virgin materials from the nearest borrow pit, but in situations where the
available soil lacks some geotechnical properties or need some improvement for a particular
work such soil needs to be stabilized. Soil stabilization aimed at increasing or maintaining the
stability of soil mass through mechanical or chemical means (Takhelmayum, Savitha &
Krishna, 2013). However, stabilizing soil using lime, cement, chemicals, plastics, rice husk
ash, millet husk ash, corn cob ash, coconut shell ash, foundry sand, cement kiln dust, granular
blastfurnace slag (GBS), or fly ash increases the soil‘s resistance, strength and permeability
(Marto, Latifi & Sohaei, 2013). Furthermore, results and experience show that lime as a
stabilizer yields better results than others, but its use will make pavement structure
uneconomical, which in turn makes fly ash an alternative stabilizer.
South Africa: Fly Ash Producer
South Africa is the fourth largest producer of fly ash at 30 mega ton per year after the likes of
China, USA and India. This results from the fact that coal plays an important role in its
economy and it serves as the primary energy source for electricity generation (National
Inventory, 2001; Furter, 2011). Thus, the disposal of fly ash is increasingly becoming a major
concern due to possible environmental disaster. Yet, this ash has recognition as a suitable
pozzolanic material and successfully used as construction materials, even on large scale.
Globally, fly ash is being used for various purposes such as; raw material for cement and
concrete production, soil and asphalt stabilizer, embankment works, flow-able fill, and waste
stabilizer, all owning to its cement-like property (Li, Benson, Edil & Hatipoglu, 2008; Torii,
Hashimoto, Kubo, & Sannoh, 2013). Withal, South Africa only utilizes 6 percent of the
2. 21st Century Human Habitat: Issues, Sustainability and Development 427
annual production. However, one of the major factors contributing to its low utilization is the
concern of contamination of the surface and ground water during leaching process. Therefore,
this study focuses on investigating leaching of major elements in South Africa fly ash when
used as a stabilizer in road construction.
LITERATURE REVIEW
Chemistry of Fly Ash
Fly ash, a finely divided residue that results from the combustion of pulverized coal, an
amorphous ferroaluminium silicate with a matrix very similar to soil and its elemental
composition varies with types and source of coal (Comberato, Vance & Someshwar, 1997).
These ash particles are transported from the combustion chamber by exhaust gases as a result
of their light weight and collected in control devices such as filter bags and electrostatic
precipitators. They are spherical in shape and range in size from 0.5 micron to 100 micron. Its
chemical and physical properties depend greatly on several factors such as production type,
raw feed and the handling method. This in turn gives the two classes of fly ash based on the
chemical composition. Class C ashes are from sub-bituminous and lignite coals and may
contain more than 20 percent CaO with 1 percent to 3 percent free lime, while Class F ashes
are generally obtained from bituminous and anthracite coal and contain less than 20 percent
CaO with no free lime ASTM C618 (ASTM-C618, 2011).
In addition, fly ash is a heterogeneous material, which consists of major element such as;
Silicon (Si), Calcium (Ca), Aluminium (Al), Magnesium (Mg), Iron (Fe), Sodium (Na) and
Potassium (K) (Oppenshaw, 1992). Various trace elements also contained in Fly Ash are
Cobalt (Co), Cadmium (Cd), Arsenic (As), Selenium (Se), Zinc (Zn), Molybdenum (Mo),
Manganese (Mn), Lead (Pb), Boron (B), Copper (Cu), and Nickel (Ni) (Ojo, 2010; Snellings,
Mertens, & Elsen, 2012). These chemical compositions give it variability in properties
(Gitari, 2009). In the United States, the Environmental Protection Agency issued reports on
the environmental friendliness of fly ash and protected legislatively as non-hazardous waste.
In like manners, it was successfully used in transportation projects and thus, regarded as an
important component of the high performance designs in Europe (American Road and
Transportation Builders Association, Transportation Development Foundation (ARTB-TDF)
(ARTB-TDF, 2014)).
Fly Ash as Stabilizer
Various studies have been conducted on fly ash utilization as soil stabilizer and as an
alternative to the use of virgin materials. Senol, Bin-Shafique, Edil & Benson, (2002) carried
out a study on the use of self-cementing class C fly ash for the stabilization of soft sub-grade.
In this study, the optimum mix design and stabilized layer thickness were estimated by
strength and modulus-based approaches. The results obtained showed that the engineering
properties such as unconfined compressive strength (UCS), California bearing ratio (CBR)
and resilient modulus increase substantially after fly ash utilization. Also, in 2002, Pandian
and Krishna conducted laboratory CBR tests on the stabilized fly ash-soil mixtures and
observed that fly ash is an effective admixture for improving the soil quality. In addition,
Brooks (2009) reported the soil stabilization with rice husk ash and fly ash mixed together
with natural soil, the study showed improvement in CBR values and UCS. Also, researchers
have proven that mixtures of fly ash with inert materials reach 50 percent to 70 percent of the
strength of the corresponding cement-inactive materials (Eskioglou & Oikonomou, 2008).
According to literatures, it was noted that the use of Class C is more dominant especially in
road construction while Class F is only finding usage in concrete works; this however, results
from Class C self-cementing properties and its endorsement as non-hazardous material from
international bodies. Generally, fly ash landfill sites are an environmental concern due to
3. 21st Century Human Habitat: Issues, Sustainability and Development 428
possible release of contaminants to the ground and surface water, however according to
Heebink and Hassett (2001) when fly ash is used as stabilizer; chemical reaction takes place,
which binds the particles of fly ash and consequently, reduce the chances to pollution.
Furthermore, Heebink and Hassett conducted laboratory leaching and field run-off sample;
results indicated that fly ash constituent‘s exhibit limited mobility. Consequently, fly ash
Class C is an environmental option and of engineering advantages when used properly for
soil stabilization. In essence, leachate test should be conducted on fly ash to analyse its
solubility (Oppenshaw, 1992; Solc, Foster, & Butler, 1995). However, studies show that
leachate of fly ash is highly variable as it‘s depends on the type of coal and plant in question,
and also decreases with age (Moolman, 2011).
However, in South Africa, the public has not yet been convinced that fly ash is
environmentally safe, due to the fact that European and American countries completed
research on Class C Fly Ash and South Africa only produces Class F. Nevertheless, for a
Class F to use as stabilizer, a reaction starter such as lime and cement is needed because it is
low calcium (American Coal Ash Association, 1995). Yet, there are only limited studies on
the environmental friendliness of Class F produced in South Africa. Considering its
production per year in South Africa, the government is at the stage where it is strategically
finding ways to reduce fly ash through treatment, re-use and beneficiation. Overall, the use of
fly ash in road construction provides viable alternative to non-renewable primary aggregates,
yet the question remains; what is the environmental impact of using Class F fly ash as soil
stabilizer in road construction?
MATERIALS AND METHODOLOGY
In this study, basic construction materials for road construction are used. A G5 granite
material specified for sub-base construction and this material will be stabilized using three
different Class F fly ash which are; Kendal dump ash, Durapozz and Pozzfill. Kendal dump
ash was sampled directly from the dumpsite while other samples were sourced from
processed fly ash suppliers. Durapozz is the highest quality processed ash in South Africa
that conforms to international standards while Pozzfill only conforms to certain international
standards. However, both Durapozz and Pozzfill are successfully utilized for cement
production in South Africa.
As early mentioned, cement would be use to start-up the reaction process, cementing agent
such as; LAFARGE CEM II 32,5 VA(S-V) and AFRISAM CEM II 32,5 B-M(S-V). The
justification for the selection of these cements is because they are specially developed for
stabilization purpose and commonly used for road works here in South Africa. In addition,
these cements are more effective for low clay content and gain strengths early, and both
cement types have an improved durability and is effective across a wide range of materials.
Based on the scope of this study, leach testing was conducted on classified G5 material
stabilized with cement and fly ash with the following mixtures:
1% LAFARGE
1% AFRISAM
1% LAFARGE mixed with 16% Dump Ash
1% LAFARGE mixed with 16% Pozzfill
1% LAFARGE mixed with 16% Durapozz
1% AFRISAM mixed with 18% Dump Ash
1% AFRISAM mixed with 18% Pozzfill
1% AFRISAM mixed with 18% Durapozz
4. 21st Century Human Habitat: Issues, Sustainability and Development 429
The above mixtures were subjected to leach testing and compared to maximum allowed trace
elements in water. Stabilization with fly ash and cement is not only to gain strength and meet
required specifications but it can also be used to ―entomb‖ the harmful elements that can
enter and contaminate the ground water system. Once these elements are shown to be less
than the maximum allowed elements found in drinking water, then it can be concluded that
the use of fly ash in road stabilization can be used and that the risk of harmful elements being
released to the environment will be negligible.
FINDINGS AND DISCUSSIONS
Using an X-Ray spectrometry analyser, elements similar to those found in other fly ash
around the world were noticed in typical Class F fly ash. Some of the elements with their
range in part per billion (ppb) are; Bi (3.8), Br (˂2), Ce (235), Co (16), Cs (7.8), Zr (476), and
those listed in Table 1 were found in this South Africa Class F fly ash. However, in order to
environmentally assess this ash and understand these elements, a comparison analysis must
be conducted to show the impact of their on the environment, if any. Water is the main source
for human and environmental survival; therefore, elements are compared to the maximum
allowed concentrations in water fit for human consumption (Bicki & Hirschi, 1993). Table 1
further showed the comparisons of required maximum allowed elements also found in fly ash
with possible health effects. It must be noted that these results are from ash found in dump
sites without any treatment; therefore, it is critical that leach tests are conducted for potential
hazards before considering the use of fly ash in any destined road construction project. Fly
ash with no treatment shows that leached elements namely: Barium (Ba), Chromium (Cr) and
Lead (Pb), are of a concern once the elements have leached into the groundwater and the
possible effect is also reflected in Table 1. Arsenic (As) however, is low and does not create a
concern if leached into the groundwater.
Furthermore, table 1 shows higher levels of Ba and Cr in fly ash, thus this implies that fly ash
left in dump sites can be harmful once leached elements find their way into the ground water.
However, when samples enhanced with cement as stabilizer for G5 soil were tested, results
show that the leach elements have limited mobility (Table 2) when compared with those of
table 1. In addition, comparing table 1 and 2, one must keep in mind that the results in table 2
are shown as ppm while those in table 1 are shown as ppb. Considering this, the cement
enhanced fly ash can be said to have experience a tremendous reduction in leach element as a
result of the entombed reaction that takes place between the soil, fly ash and cement. Also, it
is worthy to note that G5 soil stabilized with only cement did produced these leach elements
yet, the results are all below the maximum allowable in drinking water.
Table 1 Some elements in typical Class F Fly Ash and maximum allowable in drinking water
Element
Class F Fly Ash
(ppb)
Maximum Acceptable Level
(ppb)
Possible Effects of Higher Levels
As 20 50 Lung Cancer, kidney damage
Ba 1502 1000 Heart damage
Cr 190 50 Liver, kidney damage
Cu 49 49 Metallic taste, blue-green stains on fixtures
Pb 54 50 Brain damage
Se 2.8 10 Growth inhibition
Zn 49 N/A Metallic taste
Conclusively, fly ash at fresh stage has an approximate pH of 11.5; this pH tends to reduce to
about 8.5 due to weathering process as a result of being left on dump sites (Surridge, van der
Merwe & Kruger, 2009; Ayanda, Fatoki, Adekola & Ximba, 2012). However, considering
the results presented in table 3, the pH of the G5 soil stabilized with cement enhanced fly ash,
shows that the material maintain an alkalinity pH position. This implies that when Class F fly
5. 21st Century Human Habitat: Issues, Sustainability and Development 430
ash is enhanced with cement, it can perform as a stabilizer without affecting the environment
negatively.
Table 2 Leach results of G5 soil stabilized with cement enhanced fly ash
Leachate (parts per million (ppm))
As Ba Cr Cu Pb Se Zn
G5 + 1% LAFARGE 5.36 ˂ 4 8.56 18.89 ˂ 6 ˂ 0.4 ˂ 60
G5 + 1% AFRISAM 5.32 ˂ 4 8.18 15.91 ˂ 6 ˂ 0.4 ˂ 60
G5 + 1% LAFARGE + 16% Dump
Ash
7.59 ˂ 4 23.97 16.39 ˂ 6 ˂ 0.4 ˂ 60
G5 + 1% LAFARGE + 16% Pozzfill 13.65 ˂ 4 58.11 14.88 ˂ 6 1.56 ˂ 60
G5 + 1% LAFARGE + 16%
Durapozz
15.30 ˂ 4 46.35 14.24 ˂ 6 ˂ 0.4 ˂ 60
G5 + 1% AFRISAM + 18% Dump
Ash
8.19 ˂ 4 8.89 17.11 ˂ 6 ˂ 0.4 ˂ 60
G5 + 1% AFRISAM + 18% Pozzfill 15.04 ˂ 4 59.14 17.14 ˂ 6 ˂ 0.4 ˂ 60
G5 + 1% AFRISAM + 18% Durapozz 19.41 ˂ 4 50.29 14.20 ˂ 6 2.33 ˂ 60
Table 3 pH values of G5 soil stabilized with cement enhanced fly ash
Leachate
Description
pH Alkalinity Acidity
mg/L CaCO3 mg/L CaCO3
G5 + 1% LAFARGE 10.54 51.47 0
G5 + 1% AFRISAM 10.56 51.47 0
G5 + 1% LAFARGE + 16% Dump Ash 10.57 60.2 0
G5 + 1% LAFARGE + 16% Pozzfill 10.82 71.92 0
G5 + 1% LAFARGE + 16% Durapozz 10.77 66.49 0
G5 + 1% AFRISAM + 18% Dump Ash 10.29 42.89 0
G5 + 1% AFRISAM + 18% Pozzfill 10.65 60.05 0
G5 + 1% AFRISAM + 18% Durapozz 10.77 60.05 0
CONCLUSION
Using fly ash as alterative material in place of conventional materials is continually gaining
interest over decade. This results from its international recognition as non-hazardous
construction material. However, it must be noted that fly ash composition varies and thus it
cannot be generalized that every fly ash is non-hazardous. Although, fly ash is produced in
large quantity in South Africa, yet it utilization on annual basis remains at 6 percent which is
majorly utilized in cement and concrete production. Thus, this study investigated the
environmental effect of Class C fly ash when used as a soil stabilizer for road construction.
The results of this study showed that trace amounts of elements which might be leached to
the ground water when fly ash is used in road project is not harmful. This is based on the
laboratory leach test results which indicated that fly ash constituents when used as soil
stabilizer exhibited limited mobility, thus it can serve as an alternative stabilizer in road
construction when used properly and environmental sustainable. Results also show that
elements in fly ash vary from different classes and if South Africa Class F fly ash is left on
dumps sites without utilization; potential hazardous elements can be release into the ground
water and thus, before utilization for any project a full comprehensive test must be conducted
at the design stage.
Furthermore, critical variables which include the sample size and particles size distribution,
leachant volume, pH, and duration of leachant test. The project objective, type of material
and type of data desired will determine the most appropriate method. It must be kept in mind
that when tests are performed with some methods, extraneous variables, such as analytical
6. 21st Century Human Habitat: Issues, Sustainability and Development 431
sensitivity and sample inhomogeneity may influence the reproducibility of the results. The
leach results have shown that the elements in the ash were ―entombed‖ and the possibility of
leachant releasing agents of a dangerous nature are to a minimal. The results have shown a
tremendous reduction in leach agents and have shown that it is even safe if the minor leach
agents do enter the drinking water tables. The leach tests in this study have shown that the fly
ash enhanced with cement as stabilizer is environmental friendly. It also shows that the fly
ash particles that are normally released are bound within the soil due to chemical reactions
and continue to be bound as long as reactions take place.
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