This document discusses a study on using accelerated curing to improve quality control of concrete. Accelerated curing involves elevated curing temperatures to increase the rate of strength gain in concrete. The study aims to investigate the reliability of using a single correlation equation to predict 28-day concrete strengths when minor changes are made to mix proportions. Specifically, it analyzes how well a single correlation performs for concrete mixes with water-cement ratios of 0.60, 0.50, and 0.35 when cement or water content are varied by up to 1% based on code-allowed tolerances. It also compares results to correlations provided in the Indian standard IS 9013 for warm water curing. The results can help concrete producers determine
This document discusses quality control of concrete through various tests on fresh and hardened concrete. It begins with an introduction to concrete and quality, then discusses where quality control begins in the production of materials and continues through handling, batching, mixing, transporting and placing concrete. Key tests on fresh concrete include slump and compacting factor tests, while tests on hardened concrete include compression, tensile strength, and flexural strength tests to evaluate the quality and strength of the concrete. The document also reviews materials used in concrete such as cement, water, aggregates, and admixtures.
This document discusses quality control in concrete construction. It explains that concrete is made by mixing cement, fine aggregate, coarse aggregate, water, and admixtures. Quality control is important to ensure the concrete has strength, durability, and aesthetics. Quality control involves testing the materials used, the fresh concrete mix, and the hardened concrete. Tests on fresh concrete include slump and compacting factor tests, while tests on hardened concrete include compression, tensile, and flexural strength tests. The document outlines the quality control process from the production of materials to placement and curing of the concrete.
Top 5 Concrete Quality Control Methods at SiteSHAZEBALIKHAN1
Quality management is a holistic approach towards maintaining the quality of a product. The article discusses the 360-degree approach to maintaining the quality of concrete at the site.
A Study on Cube and Cylinder Strength of Brick Aggregate ConcreteIOSR Journals
: Concrete is unique and extensively conducive construction material by virtue of its excellent
compressive strength, which is one of the most important and useful properties of concrete. In most structural
applications, concrete is employed primarily to resist compressive stresses, which depends on plenty of factors
like properties of ingredients, design method of preparation, curing conditions etc. Generally, compressive
strength of concrete is referred to either cube strength or cylinder strength. The compressive strength of
concrete is determined by testing cubes or cylinders made in laboratory or field or cores drilled from hardened
concrete at site or from the non-destructive testing of the specimen or actual structure. The main objective of
this research was to make comparison of strength between cube and cylinder using brick aggregate concrete.
For this purpose, nine sets of mix proportions were made and studied the variation of strength between cube
and cylinder. Along with this, variation of strengths between standard and small cylinders was also observed.
Moreover, concrete was designed for two specified compressive strengths (3000 psi and 4500 psi) by American
Concrete Institute (ACI) mix design procedure. Then it was casted and tested in laboratory with proper care.
From the analysis of the test results, it had been found that cylinder strength was approximately 86 to 90
percent of cube strength and small cylinder strength was approximately 91 to 94 percent of standard cylinder
strength
This document provides information on concrete mix design, including objectives, basic considerations, and the IS (Indian Standards) method for mix design. The objectives of mix design are to achieve the desired workability, strength, durability, and cost. Basic considerations include cost, specifications, workability, strength, durability, and aggregate grading. The IS method is then described in steps, including selecting target strength, water-cement ratio, air content, water and sand contents, cement content, and aggregate contents. An example application of the IS method is also provided.
Factors affecting the strenght of concreteMUBARAKALI111
The document discusses several factors that affect the impact strength of concrete, including the shape, size and texture of aggregates, compaction methods, curing processes, and water-cement ratio. It notes that aggregates are key factors, and that proper compaction to 5-10% air void content and curing for 7-14 days are important. An ideal concrete mix ratio is listed as 1:2:4 cement to aggregate.
The document describes the Road Note No. 4 method for concrete mix design. It involves selecting proportions of ingredients including cement, water, fine aggregate and coarse aggregate to produce an economical concrete with sufficient workability, strength and durability. The method is based on extensive laboratory investigations of how factors like aggregate-cement ratio, water-cement ratio, grading and aggregate properties influence workability and strength. A six step procedure is outlined for mix design including determining compressive strength, selecting water-cement ratio, workability, grading aggregates, aggregate-cement ratio, and final mix proportions. An example problem demonstrates applying the method to design a mix meeting given requirements.
THIS PRESENTATION IS MAINLY OCCUPIED IN CE 6002 CONCRETE TECHNOLOGY UNIT NO.03......
-------FOR CIVIL ENGINEERING STUDENTS IN 2013 REGULATION =-------------------------
This document discusses quality control of concrete through various tests on fresh and hardened concrete. It begins with an introduction to concrete and quality, then discusses where quality control begins in the production of materials and continues through handling, batching, mixing, transporting and placing concrete. Key tests on fresh concrete include slump and compacting factor tests, while tests on hardened concrete include compression, tensile strength, and flexural strength tests to evaluate the quality and strength of the concrete. The document also reviews materials used in concrete such as cement, water, aggregates, and admixtures.
This document discusses quality control in concrete construction. It explains that concrete is made by mixing cement, fine aggregate, coarse aggregate, water, and admixtures. Quality control is important to ensure the concrete has strength, durability, and aesthetics. Quality control involves testing the materials used, the fresh concrete mix, and the hardened concrete. Tests on fresh concrete include slump and compacting factor tests, while tests on hardened concrete include compression, tensile, and flexural strength tests. The document outlines the quality control process from the production of materials to placement and curing of the concrete.
Top 5 Concrete Quality Control Methods at SiteSHAZEBALIKHAN1
Quality management is a holistic approach towards maintaining the quality of a product. The article discusses the 360-degree approach to maintaining the quality of concrete at the site.
A Study on Cube and Cylinder Strength of Brick Aggregate ConcreteIOSR Journals
: Concrete is unique and extensively conducive construction material by virtue of its excellent
compressive strength, which is one of the most important and useful properties of concrete. In most structural
applications, concrete is employed primarily to resist compressive stresses, which depends on plenty of factors
like properties of ingredients, design method of preparation, curing conditions etc. Generally, compressive
strength of concrete is referred to either cube strength or cylinder strength. The compressive strength of
concrete is determined by testing cubes or cylinders made in laboratory or field or cores drilled from hardened
concrete at site or from the non-destructive testing of the specimen or actual structure. The main objective of
this research was to make comparison of strength between cube and cylinder using brick aggregate concrete.
For this purpose, nine sets of mix proportions were made and studied the variation of strength between cube
and cylinder. Along with this, variation of strengths between standard and small cylinders was also observed.
Moreover, concrete was designed for two specified compressive strengths (3000 psi and 4500 psi) by American
Concrete Institute (ACI) mix design procedure. Then it was casted and tested in laboratory with proper care.
From the analysis of the test results, it had been found that cylinder strength was approximately 86 to 90
percent of cube strength and small cylinder strength was approximately 91 to 94 percent of standard cylinder
strength
This document provides information on concrete mix design, including objectives, basic considerations, and the IS (Indian Standards) method for mix design. The objectives of mix design are to achieve the desired workability, strength, durability, and cost. Basic considerations include cost, specifications, workability, strength, durability, and aggregate grading. The IS method is then described in steps, including selecting target strength, water-cement ratio, air content, water and sand contents, cement content, and aggregate contents. An example application of the IS method is also provided.
Factors affecting the strenght of concreteMUBARAKALI111
The document discusses several factors that affect the impact strength of concrete, including the shape, size and texture of aggregates, compaction methods, curing processes, and water-cement ratio. It notes that aggregates are key factors, and that proper compaction to 5-10% air void content and curing for 7-14 days are important. An ideal concrete mix ratio is listed as 1:2:4 cement to aggregate.
The document describes the Road Note No. 4 method for concrete mix design. It involves selecting proportions of ingredients including cement, water, fine aggregate and coarse aggregate to produce an economical concrete with sufficient workability, strength and durability. The method is based on extensive laboratory investigations of how factors like aggregate-cement ratio, water-cement ratio, grading and aggregate properties influence workability and strength. A six step procedure is outlined for mix design including determining compressive strength, selecting water-cement ratio, workability, grading aggregates, aggregate-cement ratio, and final mix proportions. An example problem demonstrates applying the method to design a mix meeting given requirements.
THIS PRESENTATION IS MAINLY OCCUPIED IN CE 6002 CONCRETE TECHNOLOGY UNIT NO.03......
-------FOR CIVIL ENGINEERING STUDENTS IN 2013 REGULATION =-------------------------
Concrete Grades: Types of Concrete Grade and their usesRakesh Patel
Concrete is ubiquitous at all construction sights. This may make people wonder whether there is even anything in concrete that requires planning and decision making. As a matter of fact, there are several quality details of concrete which have to be examined before you finalize on choosing one.
1. The document discusses two methods for concrete mix design: the American Concrete Institute (ACI) method and a high strength mix method.
2. It provides guidelines for each method, including required parameters for ingredients, design procedures, and equipment needed.
3. Tables are presented with information on recommended water-cement ratios, consistency measurements, volume of aggregates, and other reference data to assist with mix designs.
This presentation contains IS Concrete mix design method and Basics of Design mix of concrete.It conveys; Objectives of Mix Design ;Grades of Concrete; Nominal Mix and Design Mix; Factors affecting Choice of Mix Design; Methods of Concrete Mix Design; IS Method Of Design.
Development of mix design for high strength Concrete with AdmixturesIOSR Journals
This paper presents the result of mix design developed for high strength concrete with silica fume
and High range water reducing admixture (HRWR). It involves the process of determining experimentally the
most suitable concrete mixes in order to achieve the targeted mean strength. In this research work 53 grade
ordinary Portland cement, the locally available river sand, 10 mm graded coarse aggregate were selected based
on ASTM C 127 standard for determining the relative quantities and proportions for the grade of concrete M60.
For this design ACI 211.4R-93 guidelines were followed. Totally Five mixes were designed one mix was treated
as basic mix with HRWR - 0.5% without silica fume, Four mixes were designed with Micro silica quantities
varied from 5 to 9 percent weight of cementitious materials and HRWR varies between 0.6% to 0.9% with
increment of 0.1% . Each mix 2 numbers of 150mm x 300 mm cylinders were cast then kept in curing tank after
24 hours of time period. After 28 days of curing the specimens were tested and the appropriate mix proportions
were obtained.
This document summarizes a study on the workability and strength characteristics of fly ash concrete. Fly ash is a byproduct of coal combustion that is commonly used as a supplementary cementitious material (SCM) in concrete. The study investigated different dosages of fly ash from 0-30% replacement of cement, along with dosages of 0-1% of a superplasticizer. Tests were conducted on fresh and hardened concrete to evaluate the effects on workability, compressive strength, and the SCM properties of fly ash. The results were analyzed to better understand how fly ash influences the properties of concrete.
This document discusses the process of concrete mix design. The goal of mix design is to produce concrete with the required strength, durability and workability at the lowest cost. It describes the factors that must be considered such as minimum strength, workability, water-cement ratio and aggregate size and grading. The different types of mixes are described as nominal, standard or design mixes. The key steps of mix design are outlined, including selecting the target strength, water-cement ratio, water content, cement content and aggregate volumes. Durability, aggregate properties and mix calculations are also summarized.
Effect of water cement ratio on the compressive strength of gravel - crushed ...Alexander Decker
Reducing the water-cement ratio of concrete mixtures containing crushed over burnt bricks as a partial replacement for natural gravel as a coarse aggregate was found to increase the compressive strength of the concrete. A mixture with a 2:2 ratio of gravel to crushed bricks by volume and a water-cement ratio of 0.4 achieved the highest compressive strength of 35.9 MPa at 28 days. Using crushed over burnt bricks alone as the coarse aggregate still produced concrete but with lower strength, with a maximum strength of 29.5 MPa obtained at a water-cement ratio of 0.4. In general, decreasing the water-cement ratio was found to increase the compressive strength of the concrete mixtures by over
Workability refers to the ease with which fresh concrete can be mixed, placed, compacted and finished. It is affected by factors like water content, mix proportions, aggregate size and shape, grading and surface texture. Increasing water content or using admixtures improves workability by acting as a lubricant between particles. Larger, rounded aggregates require less water than smaller, angular ones. Well-graded aggregates with minimal voids also increase workability. Workability can be measured using slump, compacting factor, flow, or Vee Bee tests.
Properties of fresh and Hardened ConcreteVijay RAWAT
The document discusses various properties of fresh and hardened concrete. It describes workability, consistency, segregation, bleeding, mixing, placing, consolidating, and curing of fresh concrete. It also discusses compressive strength, tensile strength, modulus of elasticity, permeability, and durability of hardened concrete. The key properties of fresh concrete include workability, consistency, segregation, bleeding, setting time, and uniformity. Compressive strength is identified as the most important property of hardened concrete.
Self-compacting concrete (SCC) is a highly fluid concrete that can spread and consolidate under its own weight without vibration. It was developed in Japan in the 1980s to solve issues with vibration and ensure durable concrete structures. SCC spreads easily and fills forms completely, even around dense reinforcement. This eliminates the need for vibration and ensures uniform consolidation, but it requires precise material proportions and testing. While allowing for complex designs and construction time savings, SCC is also more expensive than traditional concrete due to material and testing costs. It therefore provides benefits for certain applications but cannot be used universally.
The document discusses making two samples of concrete with different formulations to compare their densities and properties. Sample 1 contains coarse aggregate, cement, sand and water. Sample 2 uses equal ratios of coarse and fine aggregate, along with cement, water and fibers. Both samples are tested to compare their heat insulation and strength by breaking the concrete. The proportions of cement, water and aggregates affect the density and other properties of concrete.
Fresh concrete has several important properties from mixing until it hardens in its final location. Its workability, defined as the effort to manipulate it with minimum segregation, depends on factors like water-cement ratio, aggregate properties, time, temperature, and cement characteristics. Workability is measured using tests like slump and Vebe, which assess consistency. Segregation and bleeding can occur if heavier particles separate from the paste or water rises to the surface, and are reduced by proper mix design and placement. Compaction is important to remove air bubbles while the concrete is still plastic.
The document discusses the strength of concrete and factors that influence it. It states that concrete is strong in compression but weak in tension. The principal factors that affect the strength of concrete are the water-cement ratio, quality of materials used, degree of compaction, and curing process. Non-destructive testing methods like rebound hammer, ultrasonic pulse velocity, and covermeter tests can be used to evaluate the in-place strength of hardened concrete without damaging it.
Self-compacting concrete (SCC) is a highly fluid concrete that can spread and consolidate under its own weight without vibration. It was developed in Japan in the 1980s to solve issues with vibration-induced segregation and the lack of skilled workers. SCC flows easily into formwork and passes through reinforcement without blocking. It has higher durability and quality than conventional concrete due to better compaction. SCC uses the same materials as regular concrete but requires superplasticizers and viscosity modifying agents to achieve flowability without segregation.
The document discusses various properties of fresh and hardened concrete. It describes the key materials used in concrete like cement, aggregates, and admixtures. It explains concepts like workability, bleeding, segregation, water-cement ratio, and gel space ratio for fresh concrete. For hardened concrete, it discusses compressive strength, flexural strength, tensile strength, and curing methods. It provides classifications of concrete based on weight, strength, and applications.
MEANING OF MIX DESIGN
GRADE OF CONCRETE.
FACTORS INFLUCING THE CHOICE OF MIX DESIGN.
MATHODS OF CONCRETE MIX DESIGN
MIX DESIGN BY INDIAN STANDARD METHOD.
The document discusses the steps for concrete mix design as per IS 10262-2009. It involves selecting specifications, testing materials, calculating target strength, selecting water-cement ratio based on exposure conditions, determining water content, calculating cementitious content, finding aggregate volumes, performing mix calculations, conducting trial mixes, measuring workability, and adjusting mixes based on results to achieve design requirements. The process aims to proportion a mix that meets the specified compressive strength, workability, and durability.
IRJET- Study on Mechanical Propertiesof Polymer ConcreteIRJET Journal
This document summarizes a study on the mechanical properties of polymer concrete. Specifically, it examines how adding different polymers to concrete impacts properties like compressive strength, tensile strength, and workability. Concrete cubes and beams were produced using cement, aggregates, and various polymers like polyvinyl chloride, styrene butadiene rubber latex, polystyrene, and polypropylene. Tests on the samples found that adding 10% styrene butadiene rubber latex increased compressive and tensile strengths the most compared to other polymers and plain concrete. Workability was highest with 15% styrene butadiene rubber latex. The study concludes certain polymers like polyvinyl chloride and styrene butadiene rubber latex can improve
IRJET - Effectiveness of Concrete Ingredients on Isat in DCC CubesIRJET Journal
This document discusses a study that assessed the effectiveness of different concrete ingredients on initial surface absorption test (ISAT) values in dry conditioned concrete cubes. Six different concrete mixtures were prepared varying slump, water-cement ratio, and compressive strength. ISAT tests were conducted on 72 concrete cubes according to BS 1881 standards after drying for 3 days at 105±5°C. The results showed that ISAT values increased at initial testing for mixtures with lower compressive strength and water diffusion coefficient, and decreased with higher strength, constant slump, and over time. Higher water-cement ratios and slump also increased ISAT values. The study aimed to interpret the influence of drying conditions and mixture proportions on ISAT results.
Concrete Grades: Types of Concrete Grade and their usesRakesh Patel
Concrete is ubiquitous at all construction sights. This may make people wonder whether there is even anything in concrete that requires planning and decision making. As a matter of fact, there are several quality details of concrete which have to be examined before you finalize on choosing one.
1. The document discusses two methods for concrete mix design: the American Concrete Institute (ACI) method and a high strength mix method.
2. It provides guidelines for each method, including required parameters for ingredients, design procedures, and equipment needed.
3. Tables are presented with information on recommended water-cement ratios, consistency measurements, volume of aggregates, and other reference data to assist with mix designs.
This presentation contains IS Concrete mix design method and Basics of Design mix of concrete.It conveys; Objectives of Mix Design ;Grades of Concrete; Nominal Mix and Design Mix; Factors affecting Choice of Mix Design; Methods of Concrete Mix Design; IS Method Of Design.
Development of mix design for high strength Concrete with AdmixturesIOSR Journals
This paper presents the result of mix design developed for high strength concrete with silica fume
and High range water reducing admixture (HRWR). It involves the process of determining experimentally the
most suitable concrete mixes in order to achieve the targeted mean strength. In this research work 53 grade
ordinary Portland cement, the locally available river sand, 10 mm graded coarse aggregate were selected based
on ASTM C 127 standard for determining the relative quantities and proportions for the grade of concrete M60.
For this design ACI 211.4R-93 guidelines were followed. Totally Five mixes were designed one mix was treated
as basic mix with HRWR - 0.5% without silica fume, Four mixes were designed with Micro silica quantities
varied from 5 to 9 percent weight of cementitious materials and HRWR varies between 0.6% to 0.9% with
increment of 0.1% . Each mix 2 numbers of 150mm x 300 mm cylinders were cast then kept in curing tank after
24 hours of time period. After 28 days of curing the specimens were tested and the appropriate mix proportions
were obtained.
This document summarizes a study on the workability and strength characteristics of fly ash concrete. Fly ash is a byproduct of coal combustion that is commonly used as a supplementary cementitious material (SCM) in concrete. The study investigated different dosages of fly ash from 0-30% replacement of cement, along with dosages of 0-1% of a superplasticizer. Tests were conducted on fresh and hardened concrete to evaluate the effects on workability, compressive strength, and the SCM properties of fly ash. The results were analyzed to better understand how fly ash influences the properties of concrete.
This document discusses the process of concrete mix design. The goal of mix design is to produce concrete with the required strength, durability and workability at the lowest cost. It describes the factors that must be considered such as minimum strength, workability, water-cement ratio and aggregate size and grading. The different types of mixes are described as nominal, standard or design mixes. The key steps of mix design are outlined, including selecting the target strength, water-cement ratio, water content, cement content and aggregate volumes. Durability, aggregate properties and mix calculations are also summarized.
Effect of water cement ratio on the compressive strength of gravel - crushed ...Alexander Decker
Reducing the water-cement ratio of concrete mixtures containing crushed over burnt bricks as a partial replacement for natural gravel as a coarse aggregate was found to increase the compressive strength of the concrete. A mixture with a 2:2 ratio of gravel to crushed bricks by volume and a water-cement ratio of 0.4 achieved the highest compressive strength of 35.9 MPa at 28 days. Using crushed over burnt bricks alone as the coarse aggregate still produced concrete but with lower strength, with a maximum strength of 29.5 MPa obtained at a water-cement ratio of 0.4. In general, decreasing the water-cement ratio was found to increase the compressive strength of the concrete mixtures by over
Workability refers to the ease with which fresh concrete can be mixed, placed, compacted and finished. It is affected by factors like water content, mix proportions, aggregate size and shape, grading and surface texture. Increasing water content or using admixtures improves workability by acting as a lubricant between particles. Larger, rounded aggregates require less water than smaller, angular ones. Well-graded aggregates with minimal voids also increase workability. Workability can be measured using slump, compacting factor, flow, or Vee Bee tests.
Properties of fresh and Hardened ConcreteVijay RAWAT
The document discusses various properties of fresh and hardened concrete. It describes workability, consistency, segregation, bleeding, mixing, placing, consolidating, and curing of fresh concrete. It also discusses compressive strength, tensile strength, modulus of elasticity, permeability, and durability of hardened concrete. The key properties of fresh concrete include workability, consistency, segregation, bleeding, setting time, and uniformity. Compressive strength is identified as the most important property of hardened concrete.
Self-compacting concrete (SCC) is a highly fluid concrete that can spread and consolidate under its own weight without vibration. It was developed in Japan in the 1980s to solve issues with vibration and ensure durable concrete structures. SCC spreads easily and fills forms completely, even around dense reinforcement. This eliminates the need for vibration and ensures uniform consolidation, but it requires precise material proportions and testing. While allowing for complex designs and construction time savings, SCC is also more expensive than traditional concrete due to material and testing costs. It therefore provides benefits for certain applications but cannot be used universally.
The document discusses making two samples of concrete with different formulations to compare their densities and properties. Sample 1 contains coarse aggregate, cement, sand and water. Sample 2 uses equal ratios of coarse and fine aggregate, along with cement, water and fibers. Both samples are tested to compare their heat insulation and strength by breaking the concrete. The proportions of cement, water and aggregates affect the density and other properties of concrete.
Fresh concrete has several important properties from mixing until it hardens in its final location. Its workability, defined as the effort to manipulate it with minimum segregation, depends on factors like water-cement ratio, aggregate properties, time, temperature, and cement characteristics. Workability is measured using tests like slump and Vebe, which assess consistency. Segregation and bleeding can occur if heavier particles separate from the paste or water rises to the surface, and are reduced by proper mix design and placement. Compaction is important to remove air bubbles while the concrete is still plastic.
The document discusses the strength of concrete and factors that influence it. It states that concrete is strong in compression but weak in tension. The principal factors that affect the strength of concrete are the water-cement ratio, quality of materials used, degree of compaction, and curing process. Non-destructive testing methods like rebound hammer, ultrasonic pulse velocity, and covermeter tests can be used to evaluate the in-place strength of hardened concrete without damaging it.
Self-compacting concrete (SCC) is a highly fluid concrete that can spread and consolidate under its own weight without vibration. It was developed in Japan in the 1980s to solve issues with vibration-induced segregation and the lack of skilled workers. SCC flows easily into formwork and passes through reinforcement without blocking. It has higher durability and quality than conventional concrete due to better compaction. SCC uses the same materials as regular concrete but requires superplasticizers and viscosity modifying agents to achieve flowability without segregation.
The document discusses various properties of fresh and hardened concrete. It describes the key materials used in concrete like cement, aggregates, and admixtures. It explains concepts like workability, bleeding, segregation, water-cement ratio, and gel space ratio for fresh concrete. For hardened concrete, it discusses compressive strength, flexural strength, tensile strength, and curing methods. It provides classifications of concrete based on weight, strength, and applications.
MEANING OF MIX DESIGN
GRADE OF CONCRETE.
FACTORS INFLUCING THE CHOICE OF MIX DESIGN.
MATHODS OF CONCRETE MIX DESIGN
MIX DESIGN BY INDIAN STANDARD METHOD.
The document discusses the steps for concrete mix design as per IS 10262-2009. It involves selecting specifications, testing materials, calculating target strength, selecting water-cement ratio based on exposure conditions, determining water content, calculating cementitious content, finding aggregate volumes, performing mix calculations, conducting trial mixes, measuring workability, and adjusting mixes based on results to achieve design requirements. The process aims to proportion a mix that meets the specified compressive strength, workability, and durability.
IRJET- Study on Mechanical Propertiesof Polymer ConcreteIRJET Journal
This document summarizes a study on the mechanical properties of polymer concrete. Specifically, it examines how adding different polymers to concrete impacts properties like compressive strength, tensile strength, and workability. Concrete cubes and beams were produced using cement, aggregates, and various polymers like polyvinyl chloride, styrene butadiene rubber latex, polystyrene, and polypropylene. Tests on the samples found that adding 10% styrene butadiene rubber latex increased compressive and tensile strengths the most compared to other polymers and plain concrete. Workability was highest with 15% styrene butadiene rubber latex. The study concludes certain polymers like polyvinyl chloride and styrene butadiene rubber latex can improve
IRJET - Effectiveness of Concrete Ingredients on Isat in DCC CubesIRJET Journal
This document discusses a study that assessed the effectiveness of different concrete ingredients on initial surface absorption test (ISAT) values in dry conditioned concrete cubes. Six different concrete mixtures were prepared varying slump, water-cement ratio, and compressive strength. ISAT tests were conducted on 72 concrete cubes according to BS 1881 standards after drying for 3 days at 105±5°C. The results showed that ISAT values increased at initial testing for mixtures with lower compressive strength and water diffusion coefficient, and decreased with higher strength, constant slump, and over time. Higher water-cement ratios and slump also increased ISAT values. The study aimed to interpret the influence of drying conditions and mixture proportions on ISAT results.
Study on the Influence of Anti-Stripping Agents in Bituminous ConstructionIRJET Journal
This study evaluated the effect of anti-stripping agents on bituminous concrete performance using locally available aggregates in Kerala, India which has about 130 rainy days per year. Tests were conducted on aggregates, bitumen, and bituminous concrete mixes with and without the anti-stripping agent Rediset LQ 1102. The addition of 0.55-0.75% Rediset increased mix stability and tensile strength ratio, reducing moisture susceptibility. Using anti-stripping agents in bituminous mixes was concluded to improve pavement longevity in wet climates like Kerala by enhancing adhesion between the aggregates and bitumen. Further study using different aggregates and anti-stripping agents was recommended.
Fundamentals of Concrete Curing Methods in Construction Industry: A case stud...IRJET Journal
This document summarizes research on concrete curing methods in different climates and conditions. It discusses how curing is important for concrete hydration but often neglected in practice due to costs. Several studies are summarized that look at the effects of different curing methods like water spraying, burlap wrapping, and curing compounds in hot, cold, and variable climates. The research shows that proper curing can significantly improve concrete strength, permeability, shrinkage resistance, and durability, especially for high-performance concretes and those with supplementary cementitious materials. However, curing methods must be tailored to the specific climate and project conditions to be effective.
IRJET- Effect of Bakelite Plastic Admixture as a Coarse Aggregate in a Concre...IRJET Journal
This document summarizes a study on the effect of using bakelite plastic as a partial replacement for coarse aggregate in concrete. The researchers prepared concrete mixes with 5%, 10%, 15%, and 20% replacements of coarse aggregate with bakelite plastic. They found that compressive strength decreased with higher bakelite content, while tensile strength increased with higher bakelite content. The study concluded that a 20% replacement of coarse aggregate provided the maximum tensile strength of concrete at 28 days, demonstrating that bakelite plastic can improve some properties of concrete when used as a partial aggregate replacement.
IRJET- Effect of Bakelite Plastic Admixture as a Coarse Aggregate in a Concre...IRJET Journal
This document summarizes a study on the effect of using bakelite plastic as a partial replacement for coarse aggregate in concrete. The researchers prepared concrete mixes with 5%, 10%, 15%, and 20% replacements of coarse aggregate with bakelite plastic. They found that compressive strength decreased with higher bakelite content, while tensile strength increased with higher bakelite content. The study concluded that a 20% replacement of coarse aggregate provided the maximum tensile strength of concrete at 28 days, demonstrating that bakelite plastic can improve some properties of concrete when used as a partial aggregate replacement.
EXPERIMENTAL INVESTIGATION ON PERFORMANCE OF WHITE TOPPING OVER FLEXIBLE PAVE...IRJET Journal
This document summarizes an experimental investigation on using white topping as a rehabilitation method for flexible pavements. White topping involves placing a layer of plain cement concrete over an existing asphalt pavement. The study aimed to evaluate design methodologies for repairing potholes with white topping layers and compare its performance to bituminous concrete mixes. Materials were tested and a mix design was developed for M40 grade concrete according to codes. Specimens were cast and tested for compressive, split tensile, and flexural strength at various ages. Results showed that white topping improved the lifespan and load bearing capacity of roads compared to bituminous mixes.
1) The document discusses self-healing concrete that uses bacteria to heal cracks and improve the properties of concrete. It summarizes previous research on the topic and outlines an experimental study.
2) The study examines the effect of different concentrations of Bacillus subtilis bacteria on the compressive strength of M-25 grade concrete. Specimens were tested after 3, 7, and 28 days of curing.
3) The results showed that cracks in concrete specimens were healed after 30 days when treated with a paste of Bacillus subtilis bacteria and water. Higher bacterial concentrations also led to higher compressive strengths.
- The document discusses self-healing concrete that uses bacteria to heal cracks. Bacteria like Bacillus subtilis are added to concrete and produce minerals that fill cracks.
- Tests were conducted on concrete cubes with different bacteria concentrations. Compressive strength increased with higher bacteria levels and longer curing times. Cracks in specimens were observed to decrease in width after 30 days when treated with bacterial paste.
- The study concluded self-healing concrete can increase structure life and reduce repair/maintenance costs, providing an affordable sustainable option for the construction industry. Bacteria-treated concrete was found to self-heal cracks and increase compressive strength compared to conventional concrete.
IRJET- Structural Audit of 30 Years Old Building with Structural StrengtheningIRJET Journal
This document summarizes a structural audit of a 30-year-old building in Nagpur, Maharashtra, India. The audit included visual inspection, Schmidt hammer rebound tests, and ultrasonic pulse velocity tests both before and after structural strengthening was performed. The testing found some areas of the building to be of doubtful quality. Strengthening included grouting columns and repairing cracks. Retesting after strengthening showed improved but still insufficient strength at some locations. The audit recommends further strengthening such as reinforced concrete jacketing for some columns. The structural audit process allows assessment of an existing building's condition and identification of areas needing repair or retrofitting to safely extend its usable life.
IRJET - Experimental and Analytical Study on Partial Replacement of Coarse Ag...IRJET Journal
This document presents the results of an experimental and analytical study on using broken clay tiles as a partial replacement for coarse aggregate in concrete. Tests were conducted to evaluate the workability and compressive strength of concrete mixes with 0-30% tile replacement. The 25% replacement mix achieved 95% of the compressive strength of normal concrete. Flexural beam specimens were also cast and tested to failure. Cracks developed more slowly in the 25% tile beams, and their ultimate load capacity was increased by 5.62% compared to normal beams. An ANSYS model was created to analyze the beams, with results matching the experimental data within 3.57% for ultimate load. The study concluded broken tiles can be used to partially replace coarse aggregate
IRJET-Permeable Concrete as a Road PavementIRJET Journal
This document discusses permeable concrete as a potential pavement material. Permeable concrete contains voids that allow water to drain through it, addressing issues like waterlogging. It can reduce costs by eliminating needs for drainage systems. The document reviews studies on permeable concrete properties like strength and permeability. Mix designs are presented and tested, with a 4.5:1:0.4 aggregate-cement-water ratio found to produce the highest strength. Permeable concrete is found to be suitable for low-traffic rural roads but lacks strength for high-traffic areas. It has benefits like groundwater recharge if implemented but requires more study.
Evaluation of Saturated Conditioned Concrete Cubes by Initial Surface Absorpt...IRJET Journal
This document presents research on evaluating saturated concrete cubes using an Initial Surface Absorption Test (ISAT). Seventy-two concrete cubes with different mixture proportions were prepared and tested. The objectives were to examine how ISAT values are influenced by conditioning, time, water-cement ratio, and concrete grade. ISAT was performed on saturated conditioned cubes to characterize near-surface absorption for different mixtures. Results showed ISAT values increased at initial time points for lower strength mixtures, and decreased over time. Charts were developed to provide a better assessment of normal strength concrete permeability using ISAT.
IRJET-Experimental Study on Concrete Properties using Pet in Tension ZoneIRJET Journal
This document describes an experimental study on using PET fibers in the tension zone of concrete beams to improve their ductile properties. Several concrete beams were cast - a control beam without fibers and beams with PET mesh made of continuous fibers placed in the tension zone during casting. Tests were performed to analyze the flexural strength and crack width properties. The results showed that the beams with PET fiber mesh in the tension zone had slightly higher flexural strength and wider crack widths compared to the control beam without fibers. As more layers of PET mesh were added, the crack width decreased. Therefore, the PET fiber mesh was found to improve the ductile properties of concrete beams.
This document discusses research into producing high-strength concrete with a compressive strength of 80 MPa using locally available materials in Sudan. It describes two statistical approaches to developing optimized concrete mix designs: the ACI 211.4 method and using JMP statistical software. Hundreds of concrete specimens were tested with local Sudanese aggregates, silica fume, fly ash, and superplasticizers at different ages and water-cement ratios. Thirty-three high-strength concrete mix designs were successfully developed and evaluated. The results provide guidance on optimizing mix properties and demonstrate that local materials can be used to produce high-strength concrete in Sudan.
IRJET-Analysis on Mix Design of High Strength Concrete (M100)IRJET Journal
This document presents a study on the mix design of high strength concrete with a compressive strength of 111.8 MPa. Five trials were conducted to determine the optimal mix proportions. Trial 5, with a water-binder ratio of 0.25 and a cement:sand:coarse aggregate ratio of 1:1.35:2.14, achieved the target strength when specimens were cured using accelerated steam curing. The mix included 1% polycarboxylate ether-based superplasticizer and 10% silica fume to reduce water content. Compressive strengths from Trial 5 specimens indicated an average 28-day strength of 111.8 MPa, meeting the design goal. The study demonstrated that high strength
Analyzing Strength and Durability of Construction & Demolition Waste based co...IRJET Journal
The document analyzes the strength and durability of concrete bricks made by substituting construction and demolition (C&D) waste for coarse aggregate at different ratios. Various tests were conducted on the bricks to evaluate properties like compressive strength at different curing periods, water absorption, and resistance to sulfate and chloride attacks. The results showed that compressive strength generally increased with curing time but decreased with higher C&D waste content, while water absorption and effects of environmental exposures also increased with more C&D waste.
IRJET- Use of Polyethylene Glycol as Self Curing Agent in Self Curing Concret...IRJET Journal
This document summarizes an experimental study on the use of polyethylene glycol as a self-curing agent in self-curing concrete. Polyethylene glycol was added to concrete mixes in various percentages as a replacement for cement. The compressive and flexural strengths of the concrete cubes and beams were tested at 28 days. The optimum strength was achieved with 2.4% polyethylene glycol replacement for M-20 grade concrete and 1.6% replacement for M-25 grade concrete. The self-curing concrete with polyethylene glycol achieved comparable or higher strengths than traditional water-cured concrete and helps reduce water loss from the concrete for more effective curing.
IRJET- Interpretation of Compressive Strength in Concrete Cube and CylinderIRJET Journal
This document presents a study on interpreting the compressive strength of concrete cubes and cylinders using destructive and non-destructive testing methods. Concrete cubes and cylinders of varying grades (M20, M25, M30, M40) were tested at 28 days using compressive testing (destructive) as well as rebound hammer and ultrasonic pulse velocity (non-destructive) tests. The results found that the average compressive strengths from cubes were higher than cylinders. Regression analysis was used to develop relationships between the different test methods. Equations relating compressive strength to rebound number and pulse velocity were developed for both cubes and cylinders.
IRJET - Analyzing the effect of filler on the Shear strength of Grouted sandIRJET Journal
The document analyzes the effect of adding metakaolin as a partial replacement for cement on the shear strength of grouted sand. Tests were conducted on sand samples mixed with cement and 5%, 10%, and 15% metakaolin replacement at various water-binder ratios. The results showed that 10% metakaolin replacement produced the highest increase in cohesion and internal friction angle, and a water-binder ratio of 8:2 provided the best results for strengthening loose sandy soils through grouting.
Similar to IRJET- Quality Control of Concrete through Accelerated Curing (20)
TUNNELING IN HIMALAYAS WITH NATM METHOD: A SPECIAL REFERENCES TO SUNGAL TUNNE...IRJET Journal
1) The document discusses the Sungal Tunnel project in Jammu and Kashmir, India, which is being constructed using the New Austrian Tunneling Method (NATM).
2) NATM involves continuous monitoring during construction to adapt to changing ground conditions, and makes extensive use of shotcrete for temporary tunnel support.
3) The methodology section outlines the systematic geotechnical design process for tunnels according to Austrian guidelines, and describes the various steps of NATM tunnel construction including initial and secondary tunnel support.
STUDY THE EFFECT OF RESPONSE REDUCTION FACTOR ON RC FRAMED STRUCTUREIRJET Journal
This study examines the effect of response reduction factors (R factors) on reinforced concrete (RC) framed structures through nonlinear dynamic analysis. Three RC frame models with varying heights (4, 8, and 12 stories) were analyzed in ETABS software under different R factors ranging from 1 to 5. The results showed that displacement increased as the R factor decreased, indicating less linear behavior for lower R factors. Drift also decreased proportionally with increasing R factors from 1 to 5. Shear forces in the frames decreased with higher R factors. In general, R factors of 3 to 5 produced more satisfactory performance with less displacement and drift. The displacement variations between different building heights were consistent at different R factors. This study evaluated how R factors influence
A COMPARATIVE ANALYSIS OF RCC ELEMENT OF SLAB WITH STARK STEEL (HYSD STEEL) A...IRJET Journal
This study compares the use of Stark Steel and TMT Steel as reinforcement materials in a two-way reinforced concrete slab. Mechanical testing is conducted to determine the tensile strength, yield strength, and other properties of each material. A two-way slab design adhering to codes and standards is executed with both materials. The performance is analyzed in terms of deflection, stability under loads, and displacement. Cost analyses accounting for material, durability, maintenance, and life cycle costs are also conducted. The findings provide insights into the economic and structural implications of each material for reinforcement selection and recommendations on the most suitable material based on the analysis.
Effect of Camber and Angles of Attack on Airfoil CharacteristicsIRJET Journal
This document discusses a study analyzing the effect of camber, position of camber, and angle of attack on the aerodynamic characteristics of airfoils. Sixteen modified asymmetric NACA airfoils were analyzed using computational fluid dynamics (CFD) by varying the camber, camber position, and angle of attack. The results showed the relationship between these parameters and the lift coefficient, drag coefficient, and lift to drag ratio. This provides insight into how changes in airfoil geometry impact aerodynamic performance.
A Review on the Progress and Challenges of Aluminum-Based Metal Matrix Compos...IRJET Journal
This document reviews the progress and challenges of aluminum-based metal matrix composites (MMCs), focusing on their fabrication processes and applications. It discusses how various aluminum MMCs have been developed using reinforcements like borides, carbides, oxides, and nitrides to improve mechanical and wear properties. These composites have gained prominence for their lightweight, high-strength and corrosion resistance properties. The document also examines recent advancements in fabrication techniques for aluminum MMCs and their growing applications in industries such as aerospace and automotive. However, it notes that challenges remain around issues like improper mixing of reinforcements and reducing reinforcement agglomeration.
Dynamic Urban Transit Optimization: A Graph Neural Network Approach for Real-...IRJET Journal
This document discusses research on using graph neural networks (GNNs) for dynamic optimization of public transportation networks in real-time. GNNs represent transit networks as graphs with nodes as stops and edges as connections. The GNN model aims to optimize networks using real-time data on vehicle locations, arrival times, and passenger loads. This helps increase mobility, decrease traffic, and improve efficiency. The system continuously trains and infers to adapt to changing transit conditions, providing decision support tools. While research has focused on performance, more work is needed on security, socio-economic impacts, contextual generalization of models, continuous learning approaches, and effective real-time visualization.
Structural Analysis and Design of Multi-Storey Symmetric and Asymmetric Shape...IRJET Journal
This document summarizes a research project that aims to compare the structural performance of conventional slab and grid slab systems in multi-story buildings using ETABS software. The study will analyze both symmetric and asymmetric building models under various loading conditions. Parameters like deflections, moments, shears, and stresses will be examined to evaluate the structural effectiveness of each slab type. The results will provide insights into the comparative behavior of conventional and grid slabs to help engineers and architects select appropriate slab systems based on building layouts and design requirements.
A Review of “Seismic Response of RC Structures Having Plan and Vertical Irreg...IRJET Journal
This document summarizes and reviews a research paper on the seismic response of reinforced concrete (RC) structures with plan and vertical irregularities, with and without infill walls. It discusses how infill walls can improve or reduce the seismic performance of RC buildings, depending on factors like wall layout, height distribution, connection to the frame, and relative stiffness of walls and frames. The reviewed research paper analyzes the behavior of infill walls, effects of vertical irregularities, and seismic performance of high-rise structures under linear static and dynamic analysis. It studies response characteristics like story drift, deflection and shear. The document also provides literature on similar research investigating the effects of infill walls, soft stories, plan irregularities, and different
This document provides a review of machine learning techniques used in Advanced Driver Assistance Systems (ADAS). It begins with an abstract that summarizes key applications of machine learning in ADAS, including object detection, recognition, and decision-making. The introduction discusses the integration of machine learning in ADAS and how it is transforming vehicle safety. The literature review then examines several research papers on topics like lightweight deep learning models for object detection and lane detection models using image processing. It concludes by discussing challenges and opportunities in the field, such as improving algorithm robustness and adaptability.
Long Term Trend Analysis of Precipitation and Temperature for Asosa district,...IRJET Journal
The document analyzes temperature and precipitation trends in Asosa District, Benishangul Gumuz Region, Ethiopia from 1993 to 2022 based on data from the local meteorological station. The results show:
1) The average maximum and minimum annual temperatures have generally decreased over time, with maximum temperatures decreasing by a factor of -0.0341 and minimum by -0.0152.
2) Mann-Kendall tests found the decreasing temperature trends to be statistically significant for annual maximum temperatures but not for annual minimum temperatures.
3) Annual precipitation in Asosa District showed a statistically significant increasing trend.
The conclusions recommend development planners account for rising summer precipitation and declining temperatures in
P.E.B. Framed Structure Design and Analysis Using STAAD ProIRJET Journal
This document discusses the design and analysis of pre-engineered building (PEB) framed structures using STAAD Pro software. It provides an overview of PEBs, including that they are designed off-site with building trusses and beams produced in a factory. STAAD Pro is identified as a key tool for modeling, analyzing, and designing PEBs to ensure their performance and safety under various load scenarios. The document outlines modeling structural parts in STAAD Pro, evaluating structural reactions, assigning loads, and following international design codes and standards. In summary, STAAD Pro is used to design and analyze PEB framed structures to ensure safety and code compliance.
A Review on Innovative Fiber Integration for Enhanced Reinforcement of Concre...IRJET Journal
This document provides a review of research on innovative fiber integration methods for reinforcing concrete structures. It discusses studies that have explored using carbon fiber reinforced polymer (CFRP) composites with recycled plastic aggregates to develop more sustainable strengthening techniques. It also examines using ultra-high performance fiber reinforced concrete to improve shear strength in beams. Additional topics covered include the dynamic responses of FRP-strengthened beams under static and impact loads, and the performance of preloaded CFRP-strengthened fiber reinforced concrete beams. The review highlights the potential of fiber composites to enable more sustainable and resilient construction practices.
Survey Paper on Cloud-Based Secured Healthcare SystemIRJET Journal
This document summarizes a survey on securing patient healthcare data in cloud-based systems. It discusses using technologies like facial recognition, smart cards, and cloud computing combined with strong encryption to securely store patient data. The survey found that healthcare professionals believe digitizing patient records and storing them in a centralized cloud system would improve access during emergencies and enable more efficient care compared to paper-based systems. However, ensuring privacy and security of patient data is paramount as healthcare incorporates these digital technologies.
Review on studies and research on widening of existing concrete bridgesIRJET Journal
This document summarizes several studies that have been conducted on widening existing concrete bridges. It describes a study from China that examined load distribution factors for a bridge widened with composite steel-concrete girders. It also outlines challenges and solutions for widening a bridge in the UAE, including replacing bearings and stitching the new and existing structures. Additionally, it discusses two bridge widening projects in New Zealand that involved adding precast beams and stitching to connect structures. Finally, safety measures and challenges for strengthening a historic bridge in Switzerland under live traffic are presented.
React based fullstack edtech web applicationIRJET Journal
The document describes the architecture of an educational technology web application built using the MERN stack. It discusses the frontend developed with ReactJS, backend with NodeJS and ExpressJS, and MongoDB database. The frontend provides dynamic user interfaces, while the backend offers APIs for authentication, course management, and other functions. MongoDB enables flexible data storage. The architecture aims to provide a scalable, responsive platform for online learning.
A Comprehensive Review of Integrating IoT and Blockchain Technologies in the ...IRJET Journal
This paper proposes integrating Internet of Things (IoT) and blockchain technologies to help implement objectives of India's National Education Policy (NEP) in the education sector. The paper discusses how blockchain could be used for secure student data management, credential verification, and decentralized learning platforms. IoT devices could create smart classrooms, automate attendance tracking, and enable real-time monitoring. Blockchain would ensure integrity of exam processes and resource allocation, while smart contracts automate agreements. The paper argues this integration has potential to revolutionize education by making it more secure, transparent and efficient, in alignment with NEP goals. However, challenges like infrastructure needs, data privacy, and collaborative efforts are also discussed.
A REVIEW ON THE PERFORMANCE OF COCONUT FIBRE REINFORCED CONCRETE.IRJET Journal
This document provides a review of research on the performance of coconut fibre reinforced concrete. It summarizes several studies that tested different volume fractions and lengths of coconut fibres in concrete mixtures with varying compressive strengths. The studies found that coconut fibre improved properties like tensile strength, toughness, crack resistance, and spalling resistance compared to plain concrete. Volume fractions of 2-5% and fibre lengths of 20-50mm produced the best results. The document concludes that using a 4-5% volume fraction of coconut fibres 30-40mm in length with M30-M60 grade concrete would provide benefits based on previous research.
Optimizing Business Management Process Workflows: The Dynamic Influence of Mi...IRJET Journal
The document discusses optimizing business management processes through automation using Microsoft Power Automate and artificial intelligence. It provides an overview of Power Automate's key components and features for automating workflows across various apps and services. The document then presents several scenarios applying automation solutions to common business processes like data entry, monitoring, HR, finance, customer support, and more. It estimates the potential time and cost savings from implementing automation for each scenario. Finally, the conclusion emphasizes the transformative impact of AI and automation tools on business processes and the need for ongoing optimization.
Multistoried and Multi Bay Steel Building Frame by using Seismic DesignIRJET Journal
The document describes the seismic design of a G+5 steel building frame located in Roorkee, India according to Indian codes IS 1893-2002 and IS 800. The frame was analyzed using the equivalent static load method and response spectrum method, and its response in terms of displacements and shear forces were compared. Based on the analysis, the frame was designed as a seismic-resistant steel structure according to IS 800:2007. The software STAAD Pro was used for the analysis and design.
Cost Optimization of Construction Using Plastic Waste as a Sustainable Constr...IRJET Journal
This research paper explores using plastic waste as a sustainable and cost-effective construction material. The study focuses on manufacturing pavers and bricks using recycled plastic and partially replacing concrete with plastic alternatives. Initial results found that pavers and bricks made from recycled plastic demonstrate comparable strength and durability to traditional materials while providing environmental and cost benefits. Additionally, preliminary research indicates incorporating plastic waste as a partial concrete replacement significantly reduces construction costs without compromising structural integrity. The outcomes suggest adopting plastic waste in construction can address plastic pollution while optimizing costs, promoting more sustainable building practices.
Null Bangalore | Pentesters Approach to AWS IAMDivyanshu
#Abstract:
- Learn more about the real-world methods for auditing AWS IAM (Identity and Access Management) as a pentester. So let us proceed with a brief discussion of IAM as well as some typical misconfigurations and their potential exploits in order to reinforce the understanding of IAM security best practices.
- Gain actionable insights into AWS IAM policies and roles, using hands on approach.
#Prerequisites:
- Basic understanding of AWS services and architecture
- Familiarity with cloud security concepts
- Experience using the AWS Management Console or AWS CLI.
- For hands on lab create account on [killercoda.com](https://killercoda.com/cloudsecurity-scenario/)
# Scenario Covered:
- Basics of IAM in AWS
- Implementing IAM Policies with Least Privilege to Manage S3 Bucket
- Objective: Create an S3 bucket with least privilege IAM policy and validate access.
- Steps:
- Create S3 bucket.
- Attach least privilege policy to IAM user.
- Validate access.
- Exploiting IAM PassRole Misconfiguration
-Allows a user to pass a specific IAM role to an AWS service (ec2), typically used for service access delegation. Then exploit PassRole Misconfiguration granting unauthorized access to sensitive resources.
- Objective: Demonstrate how a PassRole misconfiguration can grant unauthorized access.
- Steps:
- Allow user to pass IAM role to EC2.
- Exploit misconfiguration for unauthorized access.
- Access sensitive resources.
- Exploiting IAM AssumeRole Misconfiguration with Overly Permissive Role
- An overly permissive IAM role configuration can lead to privilege escalation by creating a role with administrative privileges and allow a user to assume this role.
- Objective: Show how overly permissive IAM roles can lead to privilege escalation.
- Steps:
- Create role with administrative privileges.
- Allow user to assume the role.
- Perform administrative actions.
- Differentiation between PassRole vs AssumeRole
Try at [killercoda.com](https://killercoda.com/cloudsecurity-scenario/)
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.
Embedded machine learning-based road conditions and driving behavior monitoringIJECEIAES
Car accident rates have increased in recent years, resulting in losses in human lives, properties, and other financial costs. An embedded machine learning-based system is developed to address this critical issue. The system can monitor road conditions, detect driving patterns, and identify aggressive driving behaviors. The system is based on neural networks trained on a comprehensive dataset of driving events, driving styles, and road conditions. The system effectively detects potential risks and helps mitigate the frequency and impact of accidents. The primary goal is to ensure the safety of drivers and vehicles. Collecting data involved gathering information on three key road events: normal street and normal drive, speed bumps, circular yellow speed bumps, and three aggressive driving actions: sudden start, sudden stop, and sudden entry. The gathered data is processed and analyzed using a machine learning system designed for limited power and memory devices. The developed system resulted in 91.9% accuracy, 93.6% precision, and 92% recall. The achieved inference time on an Arduino Nano 33 BLE Sense with a 32-bit CPU running at 64 MHz is 34 ms and requires 2.6 kB peak RAM and 139.9 kB program flash memory, making it suitable for resource-constrained embedded systems.
Applications of artificial Intelligence in Mechanical Engineering.pdfAtif Razi
Historically, mechanical engineering has relied heavily on human expertise and empirical methods to solve complex problems. With the introduction of computer-aided design (CAD) and finite element analysis (FEA), the field took its first steps towards digitization. These tools allowed engineers to simulate and analyze mechanical systems with greater accuracy and efficiency. However, the sheer volume of data generated by modern engineering systems and the increasing complexity of these systems have necessitated more advanced analytical tools, paving the way for AI.
AI offers the capability to process vast amounts of data, identify patterns, and make predictions with a level of speed and accuracy unattainable by traditional methods. This has profound implications for mechanical engineering, enabling more efficient design processes, predictive maintenance strategies, and optimized manufacturing operations. AI-driven tools can learn from historical data, adapt to new information, and continuously improve their performance, making them invaluable in tackling the multifaceted challenges of modern mechanical engineering.
Comparative analysis between traditional aquaponics and reconstructed aquapon...bijceesjournal
The aquaponic system of planting is a method that does not require soil usage. It is a method that only needs water, fish, lava rocks (a substitute for soil), and plants. Aquaponic systems are sustainable and environmentally friendly. Its use not only helps to plant in small spaces but also helps reduce artificial chemical use and minimizes excess water use, as aquaponics consumes 90% less water than soil-based gardening. The study applied a descriptive and experimental design to assess and compare conventional and reconstructed aquaponic methods for reproducing tomatoes. The researchers created an observation checklist to determine the significant factors of the study. The study aims to determine the significant difference between traditional aquaponics and reconstructed aquaponics systems propagating tomatoes in terms of height, weight, girth, and number of fruits. The reconstructed aquaponics system’s higher growth yield results in a much more nourished crop than the traditional aquaponics system. It is superior in its number of fruits, height, weight, and girth measurement. Moreover, the reconstructed aquaponics system is proven to eliminate all the hindrances present in the traditional aquaponics system, which are overcrowding of fish, algae growth, pest problems, contaminated water, and dead fish.
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.