Things to Know about Concrete Strength Test

There are several ways to test the strength of hardened concrete. Some tests are completely non-destructive while some are slightly destructive, leaving small holes that can easily be patched. Individuals performing concrete strength tests must be qualified and have appropriate certifications stipulated by the ASTM standard test methods.

The easiest and most common strength test for concrete involves making a cylinder fresh and consolidated concrete and testing the hardened sample a specified age. A common requirement for casting concrete strength specimens is that moulds should be cylindrical, with a height to diameter ration of 2 is to 1. Moulds used to form concrete test cylinders vertically should conform to ASTM C470. Conforming to size and ratio standards is important to ensure accurate lab test results.

The second most common type of concrete strength testing uses beam specimens that are hardened in a horizontal position instead of a cylindrical form. Beam specimens are commonly used for flexural strength testing. They are commonly formed in a mould of 6x6 inches, 20 to 21 inches long. Beams are typically used for pavement and slabs, particularly in airport pavements.

A slightly destructive form of concrete strength test involves taking cores out of a concrete structure. This is commonly used to obtain strength information on old concrete structures. The core samples or test specimens should not be taken until the concrete is strong enough to allow removal of samples without disturbing the bond between the coarse aggregate and the mortar.

In addition, to obtaining strength information on aged concrete structures, core samples may also be requested when question arise as to the quality of the concrete in place as a result of low-strength test results during construction or due to distress signs in the structure. Coring is slightly destructive, but samples can be taken from less critical locations to diminish the impact on the structure.

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