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  • Saiwal
    Saiwal

    Member • Nov 12, 2013

    Concrete cube 7 day strength

    Hi,
    I require a concrete of 40MPa strength for an experiment. for the trial mix i tested cubes after 7 days and got an average strength of 32MPa with a sd of 1, I would like to know if according to IS codes this is adequate. If not what is the desirable strength.
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  • KSS Manian

    Member • Nov 22, 2013

    Saiwal
    Hi,
    I require a concrete of 40MPa strength for an experiment. for the trial mix i tested cubes after 7 days and got an average strength of 32MPa with a sd of 1, I would like to know if according to IS codes this is adequate. If not what is the desirable strength.
    There is no clause in recent IS456:2000 take about the formula on 7th day. But in SP24 - IS456-1978 CL 5.2.1 mentioned the formula.
    upload_2013-11-23_15-57-12

    You can use this for your reference. In the recent publications they removed this formula.
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