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Dean Richards
Building control officer
Asked a question last year

What is the tolerance for compression test results of concrete, according to the standards?

What is the tolerance for compression test results of concrete, according to the standards?

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According to ACI 301-1.6.6 -“The strength of concrete is satisfactory provided that every average of three consecutive strength tests (sets) equals or exceeds the specified compressive strength and no strength test (set) falls below the design strength by more than 500 psi.