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What is standard deviation for concrete cube testing ? What is value of compressive strength to be achieved at 28 days for M 25 grade of concrete

 What is standard deviation for concrete cube testing ? What is value of compressive strength to be achieved at 28 days for M 25 grade of concrete


Answer:-  Standard deviation is evaluated to know the quality of measurements or results.

According to IS 456-2000 Assumed standard deviation of M25 is 4 N/mm2

The value of comprehensive strength to be achieved at 28 days for M25 grade of concrete is 25 N/mm2

Above is perfect answer but we must remember when we check street of cubes SD must be added to its grade that is if M 25 concrete cubes is being tested it’s strength should be around 29 N/mm2 and if you are testing actual elements strength through UPV , rebound hammer or Core samples them it should be equal to 25 N / mm2 

Again there is criteria of 15 % variation in sample of 3cubes average strength. Variation in individual cube should not be more or less than 15 % with average of three samples.



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