EVALUATE PHYSICAL PROPERTIES OF CEMENT CONCRETE AS PER IS CODES

Cement concrete is one of the most commonly used construction materials, particularly for building structures such as bridges, roads, and buildings. To ensure the quality of concrete, it is essential to evaluate its physical properties as per the guidelines provided by the Indian Standards (IS) codes. In this article, we will discuss the different physical properties of cement concrete that need to be evaluated as per the IS codes.

Compressive strength: Compressive strength is the most important physical property of concrete as it determines its load-bearing capacity. The IS code specifies that the compressive strength of concrete should be evaluated at 7 days, 14 days, and 28 days after casting the specimen. The minimum compressive strength of M20 grade concrete at 28 days should be 20 MPa.

Tensile strength: Tensile strength is the ability of concrete to withstand tensile stress. However, since concrete is weak in tension, the tensile strength is usually not evaluated directly. Instead, the IS code specifies that the flexural strength of concrete should be determined using a three-point loading test.

Modulus of elasticity: Modulus of elasticity is the ratio of stress to strain in a material. It is an important property of concrete as it affects its deformation and the behavior under load. The IS code recommends that the modulus of elasticity of concrete should be evaluated at 28 days after casting the specimen.

Shrinkage: Shrinkage is the reduction in the volume of concrete due to the loss of moisture. The IS code specifies that the shrinkage of concrete should be evaluated at 28 days after casting the specimen.

Water absorption: Water absorption is the amount of water that can be absorbed by concrete. It is an important property of concrete as it affects its durability. The IS code recommends that the water absorption of concrete should be evaluated at 28 days after casting the specimen.

Workability: Workability is the ease with which concrete can be mixed, transported, and placed without segregation. The IS code specifies that the workability of concrete should be evaluated using the slump test.

Air content: The air content of concrete is the amount of air trapped in the concrete during the mixing process. The IS code recommends that the air content of concrete should be evaluated using the pressure method.

In conclusion, the evaluation of physical properties of cement concrete as per the IS codes is essential to ensure the quality and durability of concrete. The different physical properties of concrete that need to be evaluated include compressive strength, tensile strength, modulus of elasticity, shrinkage, water absorption, workability, and air content. By adhering to the IS codes, engineers and contractors can ensure that the concrete used in construction projects meets the required standards and specifications