What are Different Tests for Concrete Quality Check?

Quality tests on concrete are performed as a part of quality control of concrete structures. Different quality tests on concrete such as compressive strength tests, slump tests, permeability tests etc.are used to assure the quality of the concrete that is supplied for a given specification. These quality tests on concrete give an idea about the properties of concrete such as strength, durability, air content, permeability etc.

ost Common Quality Tests on Fresh concrete are:

Workability of concrete mixture is measured by, Vee-bee consistometer test, Compaction factor Test, and Slump test.

Air content measures the total air content in a sample of fresh concrete but does not indicate what the final in-place air content is, because a certain amount of air is lost in transportation Consolidating, placement, and finishing.

The action of changing mixed cement from a fluid state to a solid state is called “Setting of Cement”. Initial Setting Time is defined as the period elapsing between the time when water is added to the cement and the time at which the needle of 1 mm square section fails to pierce the test block to a depth of about 5 mm from the bottom of the mold. Final Setting Time is defined as the period elapsing between the time when water is added to cement and the time at which the needle of 1 mm square section with 5 mm diameter attachment makes an impression on the test block.

Other tests conducted on fresh concrete are:

Most Common Quality Tests on hardened concrete are:

The compressive strength of concrete cube test provides an idea about all the characteristics of concrete

2. Tensile strength

The tensile strength of concrete is one of the basic and important properties which greatly affect the extent and size of cracking in structures. Moreover, the concrete is very weak in tension due to its brittle nature. Hence. it is not expected to resist the direct tension. So, concrete develops cracks when tensile forces exceed its tensile strength. Therefore, it is necessary to determine the tensile strength of concrete to determine the load at which the concrete members may crack.

Modulus of elasticity of concrete is the ratio of stress to the strain of the concrete under the application of loads.

When concrete is permeable it can cause corrosion in reinforcement in presence of oxygen, moisture, CO2, SO3- and Cl- etc. This formation of rust due to corrosion becomes nearly 6 times the volume of steel oxide layer, due to which cracking develops in reinforced concrete and spalling of concrete starts.

5. In situ test on concrete

There are various in-situ test conducted on hardened concrete, both destructive and non-destructive. Some of them are concrete pull out tests, Break off tests, Schmidt Hammer test.

Other quality tests are conducted to test the following

For more information about concrete quality, please read:

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