# How to validate the compressive strength of the concrete cube at jobsite

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This construction video tutorial will teach you the process for validating the comprehensive strength of concrete cube.

Generally, we arrange various types of cubes for casting in the site. Then we check these cubes for 7 days, 14 days, 21 days, 28 days for finding out the exact percentage of comprehensive strength.

Compressive strength of concrete cube test sheds light on all the characteristics of concrete. This test method facilitates you to verify whether Concreting is done properly or not.

Compressive strength of concrete is affected by several factors like water-cement ratio, cement strength, quality of concrete material, quality control throughout production of concrete etc.

Test for compressive strength is performed either on cube or cylinder. Different types of standard codes are followed for concrete cylinder or concrete cube as the standard sample for the test.

Method: Compressive Strength Test of Concrete Cubes

For cube test, two types of samples either cubes of 15cm X 15cm X 15cm or 10cm X 10cm x 10cm based on the size of aggregate are utilized. Generally, cubical moulds of size 15cm x 15cm x 15cm are employed.

This concrete is poured in the mould and tempered perfectly in order that any void does not occur. These moulds are taken out after 24 hours and test specimens are transferred in water for curing. The top surface of these specimens should be prepared even and smooth. It is accomplished by laying cement paste and stretching smoothly on entire area of specimen.

With the help of compression testing machine, these specimens are examined after 7 days curing or 28 days curing. Load should be served slowly at the rate of 140 kg/cm2 per minute unless the Specimens fail. To obtain the compressive strength of concrete, load at the failure is divided by area of specimen.

To learn the complete process, watch the following video tutorial.

Video Source: L & T - Learning Technology

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