A Look Into Concrete Compression Tests


The comprehensive strength of the concrete compression test offers an idea about all the characteristics of concrete. By this single test, one can judge whether concreting has been done correctly or not. The compressive strength of concrete for general construction varies from 15 MPa to 30 MPa and higher in industrial and commercial sectors.
Compressive strength of concrete depends upon various factors like cement strength, water-cement ratio, quality of concrete material, and quality control at the time of production of concrete, among others.
Test for compressive strength is carried out either on a cylinder or cube. Various standard codes recommend a concrete cube or cylinder as the standard specimen for the analysis.
How can compressive strength be defined?
Compressive strength can be defined as structure or material to carry loads on its surface without any deflection or crack. A material under compression tends to reduce the size when in tension, and the size elongates.
The formula of compressive strength
The formula for any material is the load applied during the time of failure to the cross-section area of the face where the pressure was applied.
Process: Compressive strength test of concrete cubes
For the concrete compression test, two types of specimens, either cubes of 15cm or 10cm depending upon the aggregate size are used. For most of the works, cubical moulds of size 15cm are used commonly.
The concrete is poured into the mould and tempered appropriately so as not to have any voids. After a day, moulds get removed, and the test specimens are put in water for curing. The top surface of the specimen is made smooth and even. This is done by placing the paste of cement and spreading it smoothly over the entire area of the specimen.
A compression testing machine tests all of them after seven or twenty-eight days of curing. The load should be applied gradually at the rate of 145kg/cm2 per minute until the specimen fails. The load at the failure divided by the specimen area gives the compressive strength of concrete.
Which machine is used for concrete strength tests?
The concrete compression test is done with the help of a compression testing machine for checking the strength of concrete.

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