Concrete Cube Compressive Strength Testing

What is the Concrete Cube Test?

The concrete cube test is performed for the purpose of determining the compressive strength of a concrete element.

The cubes used for this test have a dimension of 150 x 150 x 150 mm as long as the largest aggregate does not exceed 20 mm. Generally speaking, the cubes are cured for and tested at 7 and 28 days, although certain projects might require curing and testing times of 3, 5, 7, 14, or more days. The results from the compressive strength test are used to determine the strength of the concrete. If the test results are inconclusive or show that your concrete isn’t curing as quickly as it should, you risk not being able to advance your project as soon as you would like to.

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The Procedure for Testing Concrete Cube Compressive Strength

Performing a test for the compressive strength of a concrete cube consists of a few steps.

First off, the concrete being tested is poured into a mould meeting the size requirements mentioned above — 150 x 150 x 150mm. Second, the concrete is appropriately tempered to remove any voids or gaps in the concrete. Then, after 24 hours of curing, the test specimens are removed from the forms and put into curing baths to regulate the curing period. Once the specimens have been cured for the duration outlined in the project specifications, the surface of the specimens is made smooth and even. The specimen is then put into a compressive strength testing machine and gradually put under load at the rate of 140 kg/cm2 per minute until the specimen fails.”

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