concrete · testing

Modulus of Elasticity and Poisson’s Ratio

Concrete is not an elastic material i.e., it will not recover its original shape on unloading. In addition, it is non-linear and exhibits a non-linear stress-strain curve. Hence, the elastic constants such as modulus of elasticity and Poisson’s ratio are not strictly applicable. However, they are used in the analysis and design of concrete structures, assuming elastic behavior. The… Continue reading Modulus of Elasticity and Poisson’s Ratio

concrete · testing

Tensile Strength of Concrete

Concrete is very weak in tension, and direct tensile strength is only about 8 to 11% of the compressive strength for concrete of grade M25 and above. The use of pozzolanic materials increases the tensile strength of the materials. The strength of concrete is generally not taken into account during design of concrete elements. Knowledge… Continue reading Tensile Strength of Concrete

concrete · testing

Compressive Strength of Concrete

Compressive strength at a specified age, usually 28 days, measured on a standard cube or cylinder specimens is used as the criteria for the acceptance of concrete. The compressive strengths used in structural applications vary from 20MPa to as high as 100MPa. In India, the characteristic compressive strength (fck) is determined by testing to failure… Continue reading Compressive Strength of Concrete