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Why does modulus of elasticity of concrete reduce with time?
nikeetasharma
The modulus of elasticity of concrete can be improved. As the porosity decreases, the modulus of elasticity of cement paste increases and consequently, the elastic modulus of concrete increases. The porosity of cement paste is controlled by water to cement ratio (w/c), air content, admixture dosageRead more
The modulus of elasticity of concrete can be improved. As the porosity decreases, the modulus of elasticity of cement paste increases and consequently, the elastic modulus of concrete increases. The porosity of cement paste is controlled by water to cement ratio (w/c), air content, admixture dosage and degree of cement hydration.
See lessWhy does modulus of elasticity of concrete reduce with time?
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Modulus of elasticity of concrete is defined as the ratio of the applied stress to the corresponding strain. Not only does it demonstrate the ability of concrete to withstand deformation due to applied stress but also its stiffness. In other words, it reflects the ability of concrete to deflect elasRead more
Modulus of elasticity of concrete is defined as the ratio of the applied stress to the corresponding strain. Not only does it demonstrate the ability of concrete to withstand deformation due to applied stress but also its stiffness. In other words, it reflects the ability of concrete to deflect elasticity.
The higher the value of the modulus, the stiffer the material is. Thus comparing a high performance concrete will be higher, thereby making it a stiffer type of concrete.
See lessWhat is meant by Theoretical Thickness in Concrete?
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The thickness of the concrete cover measure is usually part of the concrete quality control in modern construction so as to ensure that the thickness of the concrete cover in conformity with the specifications. The process of measuring the thickness of the concrete cover in structures was noted by tRead more
The thickness of the concrete cover measure is usually part of the concrete quality control in modern construction so as to ensure that the thickness of the concrete cover in conformity with the specifications. The process of measuring the thickness of the concrete cover in structures was noted by the beginning of the corrosion, as the lack of concrete cover thickness increased the corrosion rate for corrosion as a result of chlorides or carbonation, where it expedited the propagation inside the concrete, causing the speed of steel corrosion as well as the lack of cover helps the propagation of moisture and oxygen, which are form the main basis for the corrosion process.
See lessWhat are the Main causes of Concrete Deterioration?
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Concrete degradation may have various causes and reasons. It can be damaged by factors like fire, alkali - aggregate reaction expansion, sea water effects, bacterial corrosion, calcium leaching, physical and chemical damage from carbonation, corrosion of reinforcements and many others.
Concrete degradation may have various causes and reasons. It can be damaged by factors like fire, alkali – aggregate reaction expansion, sea water effects, bacterial corrosion, calcium leaching, physical and chemical damage from carbonation, corrosion of reinforcements and many others.
See lessWhat is the reason for micro cracks in concrete?
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The term micro cracking refers to very small cracks that form in concrete but are not visible to the naked eye. Some microcracking occurs as a natural part of the cement hydration process, but it also occurs as compressive loads are applied. Bond cracks form where the coarse aggregate and the cementRead more
The term micro cracking refers to very small cracks that form in concrete but are not visible to the naked eye. Some microcracking occurs as a natural part of the cement hydration process, but it also occurs as compressive loads are applied. Bond cracks form where the coarse aggregate and the cement meet.
See lessWhat is the reason for micro cracks in concrete?
nikeetasharma
Probably the single most common reason for early cracks in concrete is plastic shrinkage. When the concrete is still in its plastic state (before hardening), it is full of water. This water takes up space and makes the slab a certain size. As the slab loses moisture while curing it gets a bit smalleRead more
Probably the single most common reason for early cracks in concrete is plastic shrinkage. When the concrete is still in its plastic state (before hardening), it is full of water. This water takes up space and makes the slab a certain size. As the slab loses moisture while curing it gets a bit smaller.
See lessWhat is bacterial concrete?
nikeetasharma
The principle of bacteria based self healing concrete is that carbonate precipitating bacteria are added into the concrete during the mixing process. When cracking occurs, the bacteria will be activated to precipitate CaCO3 to in-situ heal concrete cracks. Bacillus Megaterium bacteria were used in cRead more
The principle of bacteria based self healing concrete is that carbonate precipitating bacteria are added into the concrete during the mixing process. When cracking occurs, the bacteria will be activated to precipitate CaCO3 to in-situ heal concrete cracks.
Bacillus Megaterium bacteria were used in concrete and results shows 24% increase in compressive strength. The deposition of calcium carbonate in concrete by Bacillus Sphaericus improves the durability of concrete.
Therefore, bacterial concrete is a product that will biologically produce limestone to heal cracks that appear on the surface of concrete structures.
These self healing agents can lie dormant with in the concrete for up to 200 years.
See lessWhat is Soundness Property of Cement?
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Soundness property of cement is checked by Le-chatelier method as per IS:4031 (part-3) 1988.
Soundness property of cement is checked by Le-chatelier method as per IS:4031 (part-3) 1988.
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