The document discusses compressed stabilized earth blocks (CSEB). It describes CSEBs as building materials made from a mix of soil, stabilizer, and water that is compressed and dried. The document then discusses the history and development of CSEBs. It notes the various benefits of CSEBs, including being a local material, limiting deforestation, cost efficiency, and social acceptance. Some limitations are also outlined. The document focuses on the raw materials used for CSEBs, particularly different types of soil - black cotton soil, gravely soil, sandy soil, silty soil, and clayey soil - and their characteristics.
This document provides information on various mud construction techniques, including soil testing methods, stabilization techniques, and specific roofing methods like the Guna vault roof and Nubian dome. Some key points:
- Various field and lab tests are described to determine the composition and properties of soils for construction, including color, texture, biscuit, and sieve tests.
- Stabilization techniques can improve soil properties by adding materials like cement, straw or plant juices.
- The Guna vault roof is made from tapered burnt clay pipes socketed together in arches to form a strong, lightweight roof.
- The Nubian dome technique builds vaults and domes without centering by laying courses almost
This document provides information on mortars used for brick wall construction. It discusses the typical materials in mortar mixes including sand, cement, water and additives. It describes requirements for good mortar such as workability and strength. Different types of cement and sand are outlined. Guidelines for mixing mortar by hand or machine and transporting pre-mixed mortar are also provided.
- Concrete is a mixture of Portland cement, water, aggregates (sand and gravel), and sometimes admixtures. The cement and water form a paste that binds the aggregates together as the concrete hardens.
- Concrete is one of the most widely used building materials due to its versatility and ability to be formed into various shapes. It can be mixed to meet different strengths and needs.
This document provides information on concrete, its ingredients and properties. Concrete is composed of Portland cement, water, aggregates (sand and gravel/crushed stone) and sometimes admixtures. It is mixed either by hand or machine. The cement and water form a paste that binds the aggregates together as it hardens. Concrete has high compressive strength but low tensile strength. Proper curing is required for concrete to attain its full strength. Concrete is a versatile building material with many applications.
This document provides information on mortars used in construction. It defines mortar as a mixture of sand, cement and water that is used as a binding agent between bricks or blocks. It discusses the requirements for a good mortar mix, including workability, strength, bond strength and durability. It also covers the different materials used in mortar such as sand, cement and additives. Mix proportions, water-cement ratios and methods of mixing mortar are also outlined.
This document discusses building construction materials, specifically bricks. It covers the constituents needed for good brick earth, the manufacturing process of bricks which involves preparation of clay, moulding, drying, and burning. It describes hand moulding and machine moulding methods. Bricks can be burnt using clamp burning or kiln burning. Finally, it classifies burnt bricks into four categories based on their manufacturing and preparation: first class, second class, third class, and fourth class bricks.
Green building material - Compressed earth blockAditya Shah
A compressed earth block (CEB), also known as a pressed earth block or a compressed soil block, is a building material made primarily from damp soil compressed at high pressure to form blocks.
This document discusses fire bricks and sand lime bricks. It covers what they are, their ingredients, manufacturing processes, types/classifications, uses, and masonry/how to use them.
Fire bricks are made primarily to withstand high temperatures and contain silica, alumina, and other oxides. Their manufacturing process involves selection of materials, preparation, molding, drying, and firing. Sand lime bricks contain sand, lime, and water and are made through a similar process.
The document compares the ingredients and properties of fire bricks and sand lime bricks. It also discusses common defects in bricks and classifications based on quality.
This document provides information on various mud construction techniques, including soil testing methods, stabilization techniques, and specific roofing methods like the Guna vault roof and Nubian dome. Some key points:
- Various field and lab tests are described to determine the composition and properties of soils for construction, including color, texture, biscuit, and sieve tests.
- Stabilization techniques can improve soil properties by adding materials like cement, straw or plant juices.
- The Guna vault roof is made from tapered burnt clay pipes socketed together in arches to form a strong, lightweight roof.
- The Nubian dome technique builds vaults and domes without centering by laying courses almost
This document provides information on mortars used for brick wall construction. It discusses the typical materials in mortar mixes including sand, cement, water and additives. It describes requirements for good mortar such as workability and strength. Different types of cement and sand are outlined. Guidelines for mixing mortar by hand or machine and transporting pre-mixed mortar are also provided.
- Concrete is a mixture of Portland cement, water, aggregates (sand and gravel), and sometimes admixtures. The cement and water form a paste that binds the aggregates together as the concrete hardens.
- Concrete is one of the most widely used building materials due to its versatility and ability to be formed into various shapes. It can be mixed to meet different strengths and needs.
This document provides information on concrete, its ingredients and properties. Concrete is composed of Portland cement, water, aggregates (sand and gravel/crushed stone) and sometimes admixtures. It is mixed either by hand or machine. The cement and water form a paste that binds the aggregates together as it hardens. Concrete has high compressive strength but low tensile strength. Proper curing is required for concrete to attain its full strength. Concrete is a versatile building material with many applications.
This document provides information on mortars used in construction. It defines mortar as a mixture of sand, cement and water that is used as a binding agent between bricks or blocks. It discusses the requirements for a good mortar mix, including workability, strength, bond strength and durability. It also covers the different materials used in mortar such as sand, cement and additives. Mix proportions, water-cement ratios and methods of mixing mortar are also outlined.
This document discusses building construction materials, specifically bricks. It covers the constituents needed for good brick earth, the manufacturing process of bricks which involves preparation of clay, moulding, drying, and burning. It describes hand moulding and machine moulding methods. Bricks can be burnt using clamp burning or kiln burning. Finally, it classifies burnt bricks into four categories based on their manufacturing and preparation: first class, second class, third class, and fourth class bricks.
Green building material - Compressed earth blockAditya Shah
A compressed earth block (CEB), also known as a pressed earth block or a compressed soil block, is a building material made primarily from damp soil compressed at high pressure to form blocks.
This document discusses fire bricks and sand lime bricks. It covers what they are, their ingredients, manufacturing processes, types/classifications, uses, and masonry/how to use them.
Fire bricks are made primarily to withstand high temperatures and contain silica, alumina, and other oxides. Their manufacturing process involves selection of materials, preparation, molding, drying, and firing. Sand lime bricks contain sand, lime, and water and are made through a similar process.
The document compares the ingredients and properties of fire bricks and sand lime bricks. It also discusses common defects in bricks and classifications based on quality.
Stabilized mud block (SMB) or pressed earth block is a building material made primarily from damp soil compressed at high pressure to form blocks. If the blocks are stabilized with a chemical binder such as Portland cement they are called compressed stabilized earth block (CSEB) or stabilized earth block (SEB).
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This document summarizes a comparative study of local building materials in Swabi region, including mud, concrete blocks, bricks, stone, and plastic bottles. Mud is a traditional material that is cheap and easily available, but requires maintenance. Concrete blocks are commonly used due to low cost and availability, though production causes pollution. Bricks production also significantly pollutes the air. Stone is clean and sustainable but heavy. Plastic bottles can be reused in building to reduce waste while engaging the community in a cheap, locally sourced construction method.
The document provides an overview of a study that aims to reduce pollution from construction materials and develop greener construction methods. It discusses using various industrial and agricultural wastes like fly ash, GGBS, rice husk, bagasse ash etc. to replace conventional materials in brick production. The objectives are listed as reducing pollution, creating greener constructions and reducing environmental impact. Various potential applications of the waste-incorporated bricks are mentioned. The literature review covers several studies that tested mechanical properties of bricks made with different waste materials and found they meet standards. The methodology section describes the raw materials used, manufacturing process, and tests conducted on the bricks.
العمارة الطينية في العالم العربي هل هي جيدة.pdfamadhor
Architect magazine last issue middle east snap acapella sad dance on flamboyant style vs Germany ag she ruined his diet Bak so let's invade iraq Abu do you have a picture for a commercial residential tower with a Hadrami style vs Germany ag she ruined
Concrete -
The most used construction material.
In here a brief about its -
Ingredients
Grades
Production &
Properties
are discussed with appropriate pictorial presentation making it quite simpler for understanding.
This document discusses the process of manufacturing bricks. It begins by describing the composition of bricks, noting that good bricks should contain 20-30% alumina, 50-60% silica, and small amounts of lime, iron oxide, and magnesia. The document then outlines the key steps in brick manufacturing: preparation of clay, moulding, drying, and burning. For moulding, it describes hand and machine methods, and for burning it explains the three stages of dehydration, oxidation, and vitrification. The document provides details on each stage of the manufacturing process.
This document discusses the process of manufacturing bricks. It begins by describing the composition of bricks, noting that good bricks should contain 20-30% alumina, 50-60% silica, and small amounts of lime, iron oxide, and magnesia. The document then outlines the key steps in brick manufacturing: preparation of clay, moulding, drying, and burning. Moulding can be done by hand or machine, drying takes 3-10 days, and burning involves dehydration, oxidation and vitrification to harden the bricks. Proper composition and manufacturing process are necessary to produce durable bricks of consistent quality.
An early version of interlocking concrete pavement dates back to the Roman Empire in 312 BC. Interlocking concrete pavement (ICP) consists of solid concrete paving units called pavers with openings that allow water to infiltrate. The pavers are placed on an open-graded aggregate base and subbase to store and infiltrate water. ICP provides benefits like permeability for stormwater management, durability lasting over 30 years, and easy repair of individual units.
This document provides an overview of the sand casting process. It discusses the key steps which include pattern making, making the sand mold, melting and pouring, and post-solidification operations. It also describes important elements like cores, gating systems, and common casting defects. The sand casting process is widely used due to its ability to cast a variety of alloys in both small and large quantities.
i. Lime plasters are characterized by high workability and suited for internal surfaces but not external surfaces in areas of heavy rainfall or where extreme water tightness is required.
ii. Lime plaster mixes have a long working time and slow strength development, making them suitable for undercoats and finishing coats with proper mix proportions and workmanship.
iii. Resistance to knocks and abrasion can be increased by using coarser aggregates or fibers, and lime plastered surfaces are suitable for paints except cement-based paints.
This document discusses mortars and plasters used in building construction. It defines mortars as mixtures used for joining bricks and stones, typically consisting of aggregates like sand and a binding material like lime or cement. It describes the different types of traditional mortars used in ancient structures like the pyramids of Egypt. It also outlines the key functions, properties, classifications, and uses of mortars and plasters. The document provides details on the preparation and curing of different types of mortars like lime, cement, and gauged mortars. It concludes with a section on sand and its classification according to origin and composition.
Sand is a naturally occurring granular material composed of finely divided rock and mineral particles. The most common constituent is silica. Sand is classified based on its formation, composition, and grain size. The main natural sources are pit sand, river sand, and sea sand. Artificial sources include recycled sand and crushed stones. Good sand is clean, coarse, chemically inert, and well graded. It is used widely in construction for mortar, concrete, and plastering. The composition and properties of sand determine its suitability for different construction applications.
This document discusses various mud construction techniques that have been used for thousands of years. It begins by explaining that mud has been one of the most essential building materials since early humans and that approximately 58% of buildings in India are made of mud bricks. It then provides details on different mud construction methods like stacked earth (COB), rammed earth, adobe, wattle and daub, formed earth (straw clay), earth filled in, compressed earth blocks, extruded earth, and cut earth. For each method, it describes the materials and construction process. It also discusses mud roofs and provides advantages and disadvantages of mud construction.
This document provides an overview of common construction materials. It begins by defining building materials as materials used for structures like buildings, dams, roads, and bridges. It then discusses the historical evolution of materials from the Stone Age to the Iron Age to modern times. The document primarily focuses on natural materials like stone, sand, wood, clay and their uses in construction. It provides classifications, properties, and examples of how these materials are used.
In this era of concrete, let's understand the impact on the environment and revive the old technique, construction and make the environment pollution-free.
This document discusses four common soil-based building materials: rammed earth, adobe bricks, cob, and stabilized cement bricks (hydraform). Rammed earth is a mixture of soil, sand, cement and additives that is compacted into walls. Adobe bricks use clay, sand, straw and water molded into bricks and dried in the sun. Cob uses a wet mixture of soil, sand, straw and water applied by hand to form thick walls. Hydraform blocks are made by compressing a mixture of soil/fly ash and cement into blocks with interlocking grooves. The materials and basic construction techniques of each are described.
1. The document summarizes various low-cost construction techniques for building housing, including using natural materials like stone, mud bricks, compressed earth blocks, and bamboo.
2. It describes construction methods like rat-trap bond, corbel arches, and filler slabs that reduce costs compared to standard practices.
3. The document provides details on over 15 different low-cost materials and building techniques that can be used to help provide quality, affordable housing.
The document provides information about the settlement of Siklesh in Nepal. It discusses the introduction and definition of settlements. It then describes the settlement patterns, history, and geography of Siklesh. Some key details about Siklesh include its location at an altitude of 1,890 meters above sea level and use as a starting point for treks to Annapurna and other peaks. The document also outlines the climate, myths, economy, culture, and building structures of Siklesh.
Urban design involves arranging all elements of cities, including buildings, public spaces, transportation, and amenities. It considers urban patterns, building forms, streetscapes, connections within a city, movement systems, public open spaces, and infrastructure. The key elements of urban design are urban fabric, which is the physical form of cities made up of blocks and streets, building forms that define street walls and spaces, and connections within a city through visual lines and physical routes to facilitate movement.
Stabilized mud block (SMB) or pressed earth block is a building material made primarily from damp soil compressed at high pressure to form blocks. If the blocks are stabilized with a chemical binder such as Portland cement they are called compressed stabilized earth block (CSEB) or stabilized earth block (SEB).
interesting civil engineering topics
civil engineering topics for presentation
civil seminar topics ppt
civil engineering seminar topics 2018
seminar topics pdf
best seminar topics for civil engineering
seminar topics for mechanical engineers
latest civil engineering seminar topics
This document summarizes a comparative study of local building materials in Swabi region, including mud, concrete blocks, bricks, stone, and plastic bottles. Mud is a traditional material that is cheap and easily available, but requires maintenance. Concrete blocks are commonly used due to low cost and availability, though production causes pollution. Bricks production also significantly pollutes the air. Stone is clean and sustainable but heavy. Plastic bottles can be reused in building to reduce waste while engaging the community in a cheap, locally sourced construction method.
The document provides an overview of a study that aims to reduce pollution from construction materials and develop greener construction methods. It discusses using various industrial and agricultural wastes like fly ash, GGBS, rice husk, bagasse ash etc. to replace conventional materials in brick production. The objectives are listed as reducing pollution, creating greener constructions and reducing environmental impact. Various potential applications of the waste-incorporated bricks are mentioned. The literature review covers several studies that tested mechanical properties of bricks made with different waste materials and found they meet standards. The methodology section describes the raw materials used, manufacturing process, and tests conducted on the bricks.
العمارة الطينية في العالم العربي هل هي جيدة.pdfamadhor
Architect magazine last issue middle east snap acapella sad dance on flamboyant style vs Germany ag she ruined his diet Bak so let's invade iraq Abu do you have a picture for a commercial residential tower with a Hadrami style vs Germany ag she ruined
Concrete -
The most used construction material.
In here a brief about its -
Ingredients
Grades
Production &
Properties
are discussed with appropriate pictorial presentation making it quite simpler for understanding.
This document discusses the process of manufacturing bricks. It begins by describing the composition of bricks, noting that good bricks should contain 20-30% alumina, 50-60% silica, and small amounts of lime, iron oxide, and magnesia. The document then outlines the key steps in brick manufacturing: preparation of clay, moulding, drying, and burning. For moulding, it describes hand and machine methods, and for burning it explains the three stages of dehydration, oxidation, and vitrification. The document provides details on each stage of the manufacturing process.
This document discusses the process of manufacturing bricks. It begins by describing the composition of bricks, noting that good bricks should contain 20-30% alumina, 50-60% silica, and small amounts of lime, iron oxide, and magnesia. The document then outlines the key steps in brick manufacturing: preparation of clay, moulding, drying, and burning. Moulding can be done by hand or machine, drying takes 3-10 days, and burning involves dehydration, oxidation and vitrification to harden the bricks. Proper composition and manufacturing process are necessary to produce durable bricks of consistent quality.
An early version of interlocking concrete pavement dates back to the Roman Empire in 312 BC. Interlocking concrete pavement (ICP) consists of solid concrete paving units called pavers with openings that allow water to infiltrate. The pavers are placed on an open-graded aggregate base and subbase to store and infiltrate water. ICP provides benefits like permeability for stormwater management, durability lasting over 30 years, and easy repair of individual units.
This document provides an overview of the sand casting process. It discusses the key steps which include pattern making, making the sand mold, melting and pouring, and post-solidification operations. It also describes important elements like cores, gating systems, and common casting defects. The sand casting process is widely used due to its ability to cast a variety of alloys in both small and large quantities.
i. Lime plasters are characterized by high workability and suited for internal surfaces but not external surfaces in areas of heavy rainfall or where extreme water tightness is required.
ii. Lime plaster mixes have a long working time and slow strength development, making them suitable for undercoats and finishing coats with proper mix proportions and workmanship.
iii. Resistance to knocks and abrasion can be increased by using coarser aggregates or fibers, and lime plastered surfaces are suitable for paints except cement-based paints.
This document discusses mortars and plasters used in building construction. It defines mortars as mixtures used for joining bricks and stones, typically consisting of aggregates like sand and a binding material like lime or cement. It describes the different types of traditional mortars used in ancient structures like the pyramids of Egypt. It also outlines the key functions, properties, classifications, and uses of mortars and plasters. The document provides details on the preparation and curing of different types of mortars like lime, cement, and gauged mortars. It concludes with a section on sand and its classification according to origin and composition.
Sand is a naturally occurring granular material composed of finely divided rock and mineral particles. The most common constituent is silica. Sand is classified based on its formation, composition, and grain size. The main natural sources are pit sand, river sand, and sea sand. Artificial sources include recycled sand and crushed stones. Good sand is clean, coarse, chemically inert, and well graded. It is used widely in construction for mortar, concrete, and plastering. The composition and properties of sand determine its suitability for different construction applications.
This document discusses various mud construction techniques that have been used for thousands of years. It begins by explaining that mud has been one of the most essential building materials since early humans and that approximately 58% of buildings in India are made of mud bricks. It then provides details on different mud construction methods like stacked earth (COB), rammed earth, adobe, wattle and daub, formed earth (straw clay), earth filled in, compressed earth blocks, extruded earth, and cut earth. For each method, it describes the materials and construction process. It also discusses mud roofs and provides advantages and disadvantages of mud construction.
This document provides an overview of common construction materials. It begins by defining building materials as materials used for structures like buildings, dams, roads, and bridges. It then discusses the historical evolution of materials from the Stone Age to the Iron Age to modern times. The document primarily focuses on natural materials like stone, sand, wood, clay and their uses in construction. It provides classifications, properties, and examples of how these materials are used.
In this era of concrete, let's understand the impact on the environment and revive the old technique, construction and make the environment pollution-free.
This document discusses four common soil-based building materials: rammed earth, adobe bricks, cob, and stabilized cement bricks (hydraform). Rammed earth is a mixture of soil, sand, cement and additives that is compacted into walls. Adobe bricks use clay, sand, straw and water molded into bricks and dried in the sun. Cob uses a wet mixture of soil, sand, straw and water applied by hand to form thick walls. Hydraform blocks are made by compressing a mixture of soil/fly ash and cement into blocks with interlocking grooves. The materials and basic construction techniques of each are described.
1. The document summarizes various low-cost construction techniques for building housing, including using natural materials like stone, mud bricks, compressed earth blocks, and bamboo.
2. It describes construction methods like rat-trap bond, corbel arches, and filler slabs that reduce costs compared to standard practices.
3. The document provides details on over 15 different low-cost materials and building techniques that can be used to help provide quality, affordable housing.
The document provides information about the settlement of Siklesh in Nepal. It discusses the introduction and definition of settlements. It then describes the settlement patterns, history, and geography of Siklesh. Some key details about Siklesh include its location at an altitude of 1,890 meters above sea level and use as a starting point for treks to Annapurna and other peaks. The document also outlines the climate, myths, economy, culture, and building structures of Siklesh.
Urban design involves arranging all elements of cities, including buildings, public spaces, transportation, and amenities. It considers urban patterns, building forms, streetscapes, connections within a city, movement systems, public open spaces, and infrastructure. The key elements of urban design are urban fabric, which is the physical form of cities made up of blocks and streets, building forms that define street walls and spaces, and connections within a city through visual lines and physical routes to facilitate movement.
Estimating and costing I Chapter 2.pptxcricketreview
This document discusses different types of construction cost estimates:
1) Preliminary estimates provide a rough cost quickly without detailed drawings. Methods include plinth area rates and cube rates.
2) Detailed estimates require detailed drawings and specifications to calculate accurate quantities and costs.
3) Revised estimates are prepared when initial estimates increase over 5% due to rate or quantity changes.
4) Other estimates include supplementary, annual maintenance, extension, and complete estimates. Numerical examples demonstrate calculating plinth area rates and cube rates.
Art Deco was an artistic style that began in Paris in the 1920s and flourished internationally in the interwar period. It was a reaction against the organic forms of Art Nouveau and embraced geometric shapes, machine aesthetics, and new materials. Art Deco emphasized symmetry, straight lines and sharp angles rather than the flowing asymmetry of Art Nouveau. It featured motifs like chevrons, zigzags and sunbursts and was characterized by bold colors and lavish ornamentation representing luxury and modernity. The 1925 Paris Exposition helped establish Art Deco as a global style that influenced architecture, design and the visual arts.
The document discusses functions in C programming. It covers function prototypes, different types of functions based on return type and arguments, recursive functions, and examples of implementing various functions. It also covers preprocessor directives like file inclusion and macro substitution.
The Persian garden tradition originated in ancient Persia and has influenced garden design around the world. Persian gardens were designed in opposition to the harsh, arid landscapes, providing protected spaces for relaxation. They are carefully designed to maximize function and emotion through elements like water, shade, and indoor/outdoor connections. Mughal gardens in India were heavily influenced by the Persian charbagh layout and use of geometry, fountains, and symbolic trees and plants. Numbers like eight and nine held special significance in Mughal design.
The document discusses control structures in C programming. It defines control structures as determining the order of statement execution and categorizes them as sequential, conditional, or iterative. Conditional statements include if-else statements, switch statements, and ternary operators for decision making. Iterative statements include for, while, and do-while loops for repetitive execution. The document provides syntax examples and flowcharts for each control structure. It also discusses jumping statements like goto, break, and continue that alter normal program flow.
A pointer is a variable that stores the memory address of another variable. Pointers allow access and manipulation of other variables indirectly. There are two pointer operators - the address-of operator (&) which returns the memory address of a variable, and the dereference operator (*) which accesses the value of the variable at the memory address stored in the pointer. Pointers can be initialized by assigning the address of a variable to the pointer variable. Pointers can be used to pass arguments by reference, allowing changes made to parameters within a function to be reflected in the calling function.
The document discusses the vernacular architecture of Nepal, which varies based on topography and climate. It describes three main types: mountain, hill, and Terai. Mountain architecture uses local stone and mud, has compact forms for protection from cold, and small windows/doors. Hill architecture sometimes uses brick and thatch, emphasizes orientation for sun access, and incorporates courtyards. Terai architecture relies on air flow and ventilation, using materials like thatch, cane, and timber to allow air movement through porous walls and high ceilings.
This document summarizes a lecture on public open spaces. It discusses what public open spaces are, including that they are accessible land not built upon. It lists types of public open spaces like squares, parks, and plazas. The document outlines qualities of successful public open spaces like access, activities, safety, and sociability. It also discusses the roles of public open spaces in increasing safety, improving neighborhoods, and creating economic opportunities. Finally, the document reviews the history of public open spaces and provides criteria and keys for their successful design.
An improved modulation technique suitable for a three level flying capacitor ...IJECEIAES
This research paper introduces an innovative modulation technique for controlling a 3-level flying capacitor multilevel inverter (FCMLI), aiming to streamline the modulation process in contrast to conventional methods. The proposed
simplified modulation technique paves the way for more straightforward and
efficient control of multilevel inverters, enabling their widespread adoption and
integration into modern power electronic systems. Through the amalgamation of
sinusoidal pulse width modulation (SPWM) with a high-frequency square wave
pulse, this controlling technique attains energy equilibrium across the coupling
capacitor. The modulation scheme incorporates a simplified switching pattern
and a decreased count of voltage references, thereby simplifying the control
algorithm.
Design and optimization of ion propulsion dronebjmsejournal
Electric propulsion technology is widely used in many kinds of vehicles in recent years, and aircrafts are no exception. Technically, UAVs are electrically propelled but tend to produce a significant amount of noise and vibrations. Ion propulsion technology for drones is a potential solution to this problem. Ion propulsion technology is proven to be feasible in the earth’s atmosphere. The study presented in this article shows the design of EHD thrusters and power supply for ion propulsion drones along with performance optimization of high-voltage power supply for endurance in earth’s atmosphere.
Batteries -Introduction – Types of Batteries – discharging and charging of battery - characteristics of battery –battery rating- various tests on battery- – Primary battery: silver button cell- Secondary battery :Ni-Cd battery-modern battery: lithium ion battery-maintenance of batteries-choices of batteries for electric vehicle applications.
Fuel Cells: Introduction- importance and classification of fuel cells - description, principle, components, applications of fuel cells: H2-O2 fuel cell, alkaline fuel cell, molten carbonate fuel cell and direct methanol fuel cells.
Advanced control scheme of doubly fed induction generator for wind turbine us...IJECEIAES
This paper describes a speed control device for generating electrical energy on an electricity network based on the doubly fed induction generator (DFIG) used for wind power conversion systems. At first, a double-fed induction generator model was constructed. A control law is formulated to govern the flow of energy between the stator of a DFIG and the energy network using three types of controllers: proportional integral (PI), sliding mode controller (SMC) and second order sliding mode controller (SOSMC). Their different results in terms of power reference tracking, reaction to unexpected speed fluctuations, sensitivity to perturbations, and resilience against machine parameter alterations are compared. MATLAB/Simulink was used to conduct the simulations for the preceding study. Multiple simulations have shown very satisfying results, and the investigations demonstrate the efficacy and power-enhancing capabilities of the suggested control system.
Optimizing Gradle Builds - Gradle DPE Tour Berlin 2024Sinan KOZAK
Sinan from the Delivery Hero mobile infrastructure engineering team shares a deep dive into performance acceleration with Gradle build cache optimizations. Sinan shares their journey into solving complex build-cache problems that affect Gradle builds. By understanding the challenges and solutions found in our journey, we aim to demonstrate the possibilities for faster builds. The case study reveals how overlapping outputs and cache misconfigurations led to significant increases in build times, especially as the project scaled up with numerous modules using Paparazzi tests. The journey from diagnosing to defeating cache issues offers invaluable lessons on maintaining cache integrity without sacrificing functionality.
Electric vehicle and photovoltaic advanced roles in enhancing the financial p...IJECEIAES
Climate change's impact on the planet forced the United Nations and governments to promote green energies and electric transportation. The deployments of photovoltaic (PV) and electric vehicle (EV) systems gained stronger momentum due to their numerous advantages over fossil fuel types. The advantages go beyond sustainability to reach financial support and stability. The work in this paper introduces the hybrid system between PV and EV to support industrial and commercial plants. This paper covers the theoretical framework of the proposed hybrid system including the required equation to complete the cost analysis when PV and EV are present. In addition, the proposed design diagram which sets the priorities and requirements of the system is presented. The proposed approach allows setup to advance their power stability, especially during power outages. The presented information supports researchers and plant owners to complete the necessary analysis while promoting the deployment of clean energy. The result of a case study that represents a dairy milk farmer supports the theoretical works and highlights its advanced benefits to existing plants. The short return on investment of the proposed approach supports the paper's novelty approach for the sustainable electrical system. In addition, the proposed system allows for an isolated power setup without the need for a transmission line which enhances the safety of the electrical network
Discover the latest insights on Data Driven Maintenance with our comprehensive webinar presentation. Learn about traditional maintenance challenges, the right approach to utilizing data, and the benefits of adopting a Data Driven Maintenance strategy. Explore real-world examples, industry best practices, and innovative solutions like FMECA and the D3M model. This presentation, led by expert Jules Oudmans, is essential for asset owners looking to optimize their maintenance processes and leverage digital technologies for improved efficiency and performance. Download now to stay ahead in the evolving maintenance landscape.
2. 6.1 Introduction
• A compressed earth block (CEB), also known as a pressed earth block or a compressed
soil block
• is a building material made primarily from an appropriate mix of fairly dry
inorganic subsoil, non-expansive clay, sand, and aggregate.
• Forming compressed earth blocks requires dampening, mechanically pressing at high
pressure, and then drying the resulting material.
• There is no clear consensus about the date when man began to use earth construction.
• Some studies mentioned that that the earth for construction has been used for more than
9000 years and some studies mentioned it may have happened over 10,000 years ago.
• the earth construction begin with the beginning with the start of early agricultural
societies, a period whose current knowledge dates from 12,000 to 7000 BC.
• The compressed earth block is the modern descendent of the moulded earth block, more
commonly known as the adobe block.
3. 6.1 Introduction
• The first machines for compressing earth probably date from the 18th century.
• In France, Francois Cointeraux, inventor and fervent advocate of "new pise" (rammed
earth) designed the "crecise", a device derived from a wine-press.
• But it was not until the beginning of the 20th century that the first mechanical presses,
using heavy lids forced down into moulds, were designed.
• Some examples of this kind of press were even motor-driven.
• the turning point in the use of presses and in the way in which compressed earth blocks
were used for building and architectural purposes came only with effect from 1952.
4. 6.2 Merits of CSEB
• A Local Material
-Ideally, the production is made on the site itself or in the nearby area. Thus, it will save the
transportation, fuel, time and money.
• A bio-degradable material
-But let's imagine a building fallen down and that a jungle grows on it: the bio-chemicals
contained in the humus of the topsoil will destroy the soil cement mix in 10 or 20 years?
-CSEB will come back to our Mother Earth!
• Limiting deforestation
-Firewood is not needed to produce CSEB. It will save the forests, which are being depleted
quickly in the world, due to short view developments and the mismanagement of resources.
• Management of resources
-Each quarry should be planned for various utilizations: water harvesting pond, wastewater
treatment, reservoirs, landscaping, etc.
- It is crucial to be aware of this point: very profitable if well managed? Disastrous if
unplanned!
• Energy efficiency and eco friendliness
• Requiring only a little stabilizer the energy consumption in a m3 can be from 5 to 15 times
less than a m3 of fired bricks. The pollution emission will also be 2.4 to 7.8 times less than
fired bricks.
5. 6.2 Merits of CSEB
• · Cost efficiency
-Produced locally, with a natural resource and semi skilled labour, almost without transport,
it will be definitely cost effective! More or less according to each context and to ones
knowledge!
• An adaptable material
-Being produced locally it is easily adapted to the various needs: technical, social, cultural
habits.
- A transferable technology
- It is a simple technology requiring semi skills, easy to get. Simple villagers will be able to
learn how to do it in few weeks. Efficient training centre will transfer the technology in a
week‘s time.
• A job creation opportunity
-CSEB allows unskilled and unemployed people to learn a skill, get a job and rise in the
social values.
• Market opportunity
• According to the local context (materials, labour, equipment, etc.) the final price will vary,
but in most of the cases it will be cheaper than fired bricks.
6. 6.2 Merits of CSEB
Reducing imports
- Produced locally by semi skilled people, no need to import from far away expensive
materials or transport over long distances heavy and costly building materials.
- Flexible production scale
- Equipment for CSEB is available from manual to motorized tools ranging from
village to semi industry scale.
- The selection of the equipment is crucial, but once done properly, it will be easy to
use the most adapted equipment for each case.
• Social acceptance
-Demonstrated, since long, CSEB can adapt itself to various needs: from poor income
to well off people or governments.
-Its quality, regularity and style allow a wide range of final house products
7. 6.3 Some limitations of CSEB
• Proper soil identification is required; some soils may not be suitable.
• Ignorance about the need to manage resources.
• Ignorance of the basics for production & use.
• Wide spans, high & long building are difficult to do.
• Low technical performances compared to concrete.
• Untrained teams producing bad quality products.
• Over-stabilization through fear or ignorance, implying outrageous costs.
• Under-stabilization resulting in low quality products.
• Bad quality or un-adapted production equipment.
• Low social acceptance due to counter examples (By unskilled people, or bad soil &
equipment).
8. 6.4 The Raw Material
-The basic materials required for the production of compressed stabilized earth building
blocks
• Soil
• Stabilizer
• water
9. 6.4.1 Soil
• Soil is the main ingredient of the CSEB.
• Soil characteristics and climatic conditions of an area must be evaluated before
manufacturing soil building blocks..
• All soils are not suitable for every building need particularly CSEB.
• The basic material, -required to manufacture - is a soil containing a minimum
quantity of silt and clay so as to facilitate cohesion.
• It should be much more sandy than clayey.
• Good soil for CSEB contains the following proportion of the four components:
gravel, sand, silt and clay
10. 6.4.1 Soil
• In Nepal the main soils are classified as following five types based on the percentage of the
four components,
1) Black cotton soil
2) Gravely soil
3) Sandy soil
4) Silty soil
5) Clay soil
11. 6.4.1 Soil
• 1. Black Cotton Soil
• Black Cotton Soil have the following common characteristics:
• the colour ranges from dark grey to dark brown,
• pronounced volume change upon wetting and drying, i.e. extreme expansion and shrinkage properties,
• high (35%) clay content (clay is defined as soil fraction containing particle sizes less than 0.002mm).
• This clay fraction is composed mainly of montmorillonite, a group of soils often found in drier tropics. Its
structure allows water molecules to enter between the layers causing expansion or shrinkage,
• the liquid limit (LL) ranges between 47% and 93%,
• the plastic limit (PL) ranges between 26% and 50%,
• the plasticity index (PI) ranges between 13% and 58%,
• the linear shrinkage ranges between 8% and 18%.
• Due to the high plasticity of these soils they can be difficult materials to handle when mixed with water.
• Nevertheless, black cotton soil is a popular building material since it covers large areas in Kathmandu Valley.
• However, due to the high clay content and the presence of expandable clay minerals in this soil type, the life
span of buildings made from black cotton soils
• is normally short (approximately 15 years on average), and so there is continuous need for repair.
• In recent years it has been recognized that further study of the properties and characteristics of black cotton
soils and their potential for use in the building industry is necessary.
13. 6.4.1 Soil
• 2. Gravely Soil
• It is composed of unconsolidated rock fragments that have a general
particle size range and
• include size classes from granule- to boulder-sized fragments. A coarse-
grained soil is classed
• as gravel if more than half the coarse fraction by weight is retained on a
Number 4 sieve. Gravely soil have the following common characteristics:
equivalent diameter size (mm) : > 2 mm
• Sieving, with mesh size # 8 to 10 mm, is indispensable to remove coarse
gravel.
• - A maximum of 15% to 20% by weight of gravel passing the screen will
be allowed.
• - The maximum size for the gravel passing through the sieve will be 10
mm.
• - If the soil is too gravely, mix with it another soil, which is more clayey.
• - The minimum cement stabilization will be 4% by weight, if the clay
content is not less than 15 %.
• - The average cement stabilization will be 6% by weight.
14. 6.4.1 Soil
• 3. Sandy Soil
• Sand is naturally occurring granular material composed of finely divided
rock and mineral particles.
• The composition of sand is highly variable, but most common constituent
of sand is silica (silicon dioxide, or SiO2, usually in the form of quartz.
• Sandy soil have the following common characteristics:
• Equivalent diameter size (mm): 0.05 - 2 mm
• very coarse 1 - 2 mm
• coarse 0.5 - 1 mm
• medium 0.25 - 0.5 mm
• fine 0.1 - 0.25 mm
• very fine 0.05 - 0.1 mm
• Sieving, with mesh size # 10 to 12 mm, is only required to loosen, aerate
the soil and break up lumps.
• - Do not sieve in a very windy area, especially if the soil is dry, so as not
to loose the fine clay.
• - The minimum cement stabilization will be 5% by weight.
• - The average cement stabilization will be 6-7% by weight, if the clay
content is not less than 15%.
15. 6.4.1 Soil
• 4. Silty Soil
• Silt is granular material of a size somewhere between sand and clay
whose mineral origin is quartz and feldspar.
• Silt may occur as a soil or as suspended sediment (also known as
suspended load) in a surface water body.
• Silty soil have the following common characteristics: equivalent diameter
size (mm) 0.002 - 0.05 mm.
• A slight crushing might be required and sieving, with mesh size # 6 to 10
mm, is required.
• - Adding some coarse sand (10 to 20 %) might be needed to give more
skeletons to the soil, only if the clay content is not less than 20%.
• When the silt content is high (more than 25- 30%) and the sand very fine
(0.06 to 1mm), adding coarse sand and a clayey soil will improve the
structure.
• - The minimum cement stabilization will be 6% by weight.
• - The average cement stabilization will be 7-8% by weight.
16. 6.4.1 Soil
• 5. Clayey Soil
• Clay is a general term including many combinations of one or more clay
minerals with traces of metal oxides and organic matter.
• Clayey soil have the following common characteristics: equivalent
diameter size (mm): < 0.002 mm
• Crushing might often be required and sieving, with mesh size # 6-10 mm,
is required.
• - Adding a lot of sand (30 to 40 % ) is most the time needed to reduce the
plasticity and to
• give some skeletons.
• - The minimum cement stabilization will be 7% by weight and the
average cement
• stabilization will be 8%.
• - Lime stabilization can be used instead of cement. The minimum will be
8 % and the
• average will be 9% by weight of lime. Then, the adjunction of sand will
be reduced.
• - A combination of cement-lime stabilization, can give good results.
• For example: 3% cement + 5% lime + sand as needed.
17. 6.5 Soil Stabilizers
• Modifying soil properties by adding another material to improve its durability is called soil stabilization.
• When a soil is successfully stabilized one or more of the following
• -effects will be evident strength and cohesion of the soil will increase,
• - permeability of the soil will be reduced, the soil will be made water repellent,
• - the durability of the soil will increase, soil will shrink and expand less in dry and wet conditions.
• The chemical admixtures such as lime, cement, and/or fly ash are widely used as a mean of chemically
transforming unstable soils into structurally sound construction foundation.
• There are several methods of soil stabilization widely used to improve construction quality.
18. 6.5 Soil Stabilizers
• 6.5.1Mechanical stabilization
• This involves tamping or compacting the soil by using a heavy weight to bring about a reduction in the air void
volume, thus leading to an increase in the density of the soil.
• The main effects of compaction on the soil are to increase its strength and reduce its permeability.
• The degree of compaction possible, however, is affected greatly by the type of soil used, the moisture content
during compaction and the compression effort applied.
• Best results can be obtained by mixing the correct proportions of sand and clay in a soil.
• More recent developments for roads and embankment construction have led to compacting soil with vibrating
rollers and tampers.
• Tampers and block-making presses are also used for single storey constructions. The major drawback of
mechanically compressed stabilized earth blocks is their lack of durability especially in places of moderate to high
rainfall.
• Manual stabilization or compaction methods vary from foot treading to hand tamping equipment, with
compacting pressures varying between 0.05 to about 4MN/m2.
• Mechanical equipment may achieve compacting pressures of several thousand MN/m2.
19. 6.5 Soil Stabilizers
• 6.5.2 Cement stabilization
• Ordinary Portland cement hydrates when water is added, the reaction produces a cementitious gel that is
independent of the soil.
• This gel is made up of calcium silicate hydrates, calcium aluminate hydrates and hydrated lime. The first two
compounds form the main bulk of the cementitious gel, whereas the lime is deposited as a separate crystalline solid
phase.
• The cementation process results in deposition between the soil particles of an insoluble binder capable of
embedding soil particles in a matrix of cementitious gel. Penetration of the gel throughout the soil hydration process
is dependent on time, temperature and cement type.
• The lime released during hydration of the cement reacts further with the clay fraction forming additional
cementitious bonds.
• Soil-cement mixes should be compacted immediately after mixing in order not to break down the newly created
gel and therefore reduce strengthening.
• The basic function of cementation is to make the soil water-resistant by reducing swelling and increasing its
compressive strength.
• Cement is considered a good stabilizer for granular soils but unsatisfactory for clays.
• Generally cement can be used with any soil type, but with clays it is uneconomical because more cement is
required. The range of cement content needed for good stabilization is between 3% and 18% by weight according to
soil type.
20. 6.6 Soil Testing
• Laboratory analysis of the raw material is always necessary for large-scale production of
• compressed stabilized earth blocks. For small-scale production, however, it is not essential to
• employ sophisticated tests to establish the suitability of a soil. Simple field tests can be
• performed to get an indication of the composition of the soil sample. Such tests are discussed
• briefly below.
• a) Visual Identification:
• Dry soil is examined with the naked eye to estimate the relative propertions of the sandy and fine fraction.
• Large stones, gravel and coarse sand are removed in order to facilitate the evaluation.
• Look a humid or dry soil
• A gravely soil contains big pieces
• A sandy soil contains coarse particles
• A silty soil is thin, with small lumps
• A clayey soil is very thin, with big lump
21. 6.6 Soil Testing
• b) Smell Test:
• The soil should be smelt immediately after removal.
• If it smells musty it contains organic matter. This smell
will become stronger if the soil is heated.
• For the soil identification in field the following point
should considered
It should not smell rotten
It should not smell musty
It should smell agreeable
• c) Touch Test:
• After removing the largest grains, crumble the soil
rubbing it between the fingers and the palm
• The soil is sandy if a rough sensation is felt and has no
cohesion when moist.
• The soil is silty if it gives a lightly rough sensation and is
moderately cohesive when moistened.
• The soil is clayed, if, when dried, contains lumps or
concretions which resist crushing and if becomes plastic
when moistened.
22. 6.6 Soil Testing
• d)Sedimentation test
• To obtain a more precise idea of the nature of each soil fraction,
a simplified sedimentation test can be carried out in the field.
• The apparatus required is straight forward:
- A transparent cylindrical glass bottle with a flat bottom and a
capacity of at liter with a neck wide enough to get a hand in and a
lid to allow for shaking.
- Fill the bottle to one-third with clean water. Add approximately
the same volume of dry soil passed through a 6mm sieve and add a
teaspoonful of common salt.
- Firmly close the lid of the bottle and shake until the soil and
water are well mixed. Allow the bottle to stand on a flat surface
for about half an hour.
- Shake the bottle again for two minutes and stand on level surface
for a further 45 minutes until the water particles fall more slowly
and as a result, it will get deposited on top of the larger size
particles.
• Two or three layers will emerge, with the lowest layer containing
fine gravel, the central layer containing the sand fraction a and
hence percentages, of each fraction can be determined.
23. 6.6 Soil Testing
• e) Adhesion test
• Compact a ball of moist soil so that it does not stick to the
fingers and insert a spatula or knife.
• If the spatula penetrates it with difficulty, and soil sticks to it
upon withdrawal, the soil is extremely clayey.
• If the spatula can be pushed into it without great difficulty but a
bit of soil remains on the knife upon withdrawal the soil is
moderately clayey.
• The spatula can be pushed into the mass without encountering
any resistance at all, even if the spatula is dirty upon withdrawal
the soil contains only a little clay
25. 6.8 Sieving
• Soil contains various sizes of grain, from very fine dust
up to pieces that are still too large for use in block
production.
• The oversized material should be removed by sieving,
either using a built-in sieve, as with the pendulum crusher,
or as a separate operation.
• The simplest sieving device is a screen made from a wire
mesh, nailed to a supporting wooden frame and inclined at
approximately 45o to the ground.
• The material is thrown against the screen, fine material
passes through and the coarse, oversized material runs
down the front.
• Alternatively, the screen can be suspended horizontally
from a tree or over a pit.
• The latter method is only suitable in the case where most
material can pass through easily otherwise too much coarse
material is collected, and the screen becomes blocked and
needs frequent emptying.
26. 6.9 Proportioning
• Before starting production, tests should be performed to establish the right proportion of soil, stabilizer and water for
the production of good quality blocks.
• The proportions of these materials and water should then be used throughout the production process.
• To ensure uniformity in the compressed stabilized earth blocks produced, the weight or volume of each material used in
the block making process should be measured at the same physical state for subsequent batches of blocks.
• The volume of soil or stabilizer should ideally be measured in dry or slightly damp conditions. After establishing the
exact proportion required of each material, it is advisable to build a measuring device for each material.
• The dimensions of each measuring box should be such that their content, when full, is equivalent to the proportion
which should be mixed with other materials measured in other gauge boxes.
• Alternatively, a simple gauge box may be used for all materials. In this case, the amount of material for the production
of a given batch of blocks may be measured by filling and emptying the gauge box a number of times for each separate
material.
• For example, a batch of blocks may require ten gauge boxes of soil for one gauge box of stabilizer. Water may be
measured in a small tank or container. It is advisable to mix enough materials to allow the block-making machine to
operate for approximately one hour. Thus, the volume of the mixed material will depend on the hourly output of the block
making equipment.
27. 6.10 Mixing
• In order to produce good quality blocks, it is very important that mixing
be as thorough as possible.
• Dry materials should be mixed first until they are of uniform color, then
water is added and mixing continued until a homogeneous mix is obtained.
• Mixing can be performed by hand on a hard surface, with spades, hoes,
or shovels.
• It is much better to add a little water at a time, sprinkled over the top of
the mix from a watering can with a rose spray on the nozzle.
• The wet mix should be turned over many times with a spade or other
suitable tool.
• A little more water may then be added, and the whole mixture turned
over again. This process should be repeated until all the water has been
mixed in.
• A concrete mixer, even if available, will not be useful for mixing the wet
soil, since the latter will tend to stick on the sides of the rotating drum.
• If machinery is to be used for mixing, it should have paddles or blades
that move separately from the container. Hand-mixing methods are often
more satisfactory, more efficient and cheaper than mechanical mixing, and
are less likely to produce small balls of soil that are troublesome at the
block moulding stage.
28. 6.11 Moulding CSEB
• To manufacture blocks of uniform size and density, special precautions must be taken to mould with the same
amount of mix for each compaction by using a small wooden box as a measuring device.
• To facilitate development of the pressed blocks and to ensure good neat surfaces it is advisable to moisten the
internal faces of the machine which can be applied with a rag, brush or spray.
• (Mould immediately the mix: within 20 minutes)
29. 6.11 Moulding CSEB
• Aurum 3000
• Aurum 3000 machine is hand press machines.
• The machine consists of a frame, an interchangeable mould, a reverse toggle lever.
• Other accessories include scoops and bottom plates.
• The machine is mounted on the ground and secured in position using sand bags or stones. Measured quantity
of this mixture is poured in the die of predefined shape and dimensions and is compressed by pulling the lever
by hand.
• Then the compressed block is ejected from the die. The wet compressed blocks are stacked in rows.
• Special Features of Aurum press 3000:
• High output from the automatic opening: 1000
• strokes/day.
• = 125 Blocks/Hour (plain full size blocks)
• Handling of the press with 3 men. Mix preparation and block stacking with 4 men.
• High and adjustable compression ratio from 1.6 to 1.83
• (1.77 for 9 cm height)
• Micro adjustment of compression ratio.
• Double compression with the folding back lid.
• Rollers to move the press on site. Only 2 men are
• needed.
• Block height adjustable with ring spacers: 2.5 cm and from 5 to 10 cm.
• Micro adjustment of block height: 0.5mm accuracy
30.
31. 6.12 Curing
• To achieve maximum strength, compressed stabilized earth blocks need a period of damp curing, where they are kept
moist.
• If the block is left exposed to hot dry weather conditions, the surface material will lose its moisture and the clay particles
tend to surface cracks on the block faces.
• In practice, various methods are used to ensure proper curing. Such methods include the use of plastic bags, grass,
leaves, etc. to prevent moisture from escaping.
• The required duration of curing stabilizer is used.
• With cement stabilization, it is recommended to cure blocks for a minimum of three weeks.
• The curing period for lime stabilization should be at least four weeks.
• Compressed stabilized earth blocks should be fully cured and dry before being used for construction.
32. 6.13 Quality Control
• Compressed stabilized earth building blocks are usually larger in size than traditional burnt bricks. A typical block size is
240 x 140 x 90mm. The exact amount of stabilizer necessary must be established for any particular project. The fraction of
cement usually varies between 5% to 8% by weight.
• Golden rules
• - To create a joyful atmosphere where everybody is conscious of the quality required and check the blocks.
• - Check the production at every stage (see the production cycle).
• The pile must remain covered 2 days with a plastic sheet
• Stacking the fresh block
• Cover immediately every row with a plastic sheet.
• - Check the quality of the compression with the pocket penetrometre, always for the first block of every mix.
• - Check the height with the block height gauge, always for the first block of every mix.
• - Follow the production daily. Record the outputand dates...
• - Check weekly or monthly, the production with the field block tester (after 28 days).