Answer / himanshu

95% of the total no. Of cubes tested mus paas the design limit , in your case its 35 , However 5% can b neglected if more than 5% fail for 35Mpa the the mix i not proper. There is no definite no. Of cubes to b tested.

Answer / raju goyal

As per my view : At the time of casting of any structure we would have to taken six samples from the each load or batch in which 3 samples keep 7days and 3 samples for 28 days testing. The 7days samples should have minimum 75 % strength and 95 % strength in 28 days should be gained of it's characteristics strength .

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