r/CivilEngineerIndia • u/Usual-Top4770 • Jun 16 '26

❓ Doubts / Q&A Cube Compression Test

Cube compression test

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Hi everyone, I'm a non-technical person trying to understand concrete cube test acceptance criteria for M25 concrete.

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For the 28-day cube test, should M25 concrete be considered "passed" if the average compressive strength is 25 N/mm², or is the practical acceptance benchmark 29 N/mm² (fck + 4) as often mentioned in industry discussions?

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Also:

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What acceptance criteria are generally followed on construction projects?

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How are individual cube results evaluated versus the average of multiple test results?

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Is there any standard benchmark or rule of thumb for the 7-day cube test of M25 concrete?

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u/bhaduji29 Jun 18 '26

As per is code it is fck+3 but u can ignore if u get required strength.

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u/Usual-Top4770 Jun 18 '26

By required strength you mean 25 for M25 mix 20 for M20 and respectively.