Shrinkage and Temperature Effects

Shrinkage Effects: The total shrinkage strain in concrete is composed of the following: Autogenous Shrinkage, which occurs during the hardening of concrete. Drying Shrinkage, which is a function of the migration of water through hardened concrete. Drying shrinkage often referred to simply as shrinkage is caused by the evaporation of water from the concrete. Both Shrinkage and… Continue reading Shrinkage and Temperature Effects

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

Building Materials · concrete

Types of Concrete

There are many types of concrete designed to suit variety of purposes and depends on range of composition, finishing and performance characteristics. Some of the common types of concrete are: Ready Mixed Concrete (RMC) – It is a type of concrete that is manufactured in a factory, based on standardized mix designs and then delivered… Continue reading Types of Concrete