How to calculate compressive strength of concrete?
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Answer Posted / r.kumaresan
as per IS 456 3 cubes are mini req for testing the cubes.
prepare the std size 150x150x150 and mix ratio like
1:1:2.make 3 cubes in same ratio and leave 1 day for setting
after 1 day put on curing.if you need 7 days strength after
7 days test the specimen by using comp machine.in 7 days
specimen attain 65% of the target mean strength.in 28 days
specimen attain 90% of the target mean strength.the unit is
commonly used N/mm^2
1N = 1000 kN
Compressive strength =load in newton/Area of cube in mm2
As per thumb rule , at the time of weighing the cubes the
minimum weight of cubes are 8.1 kg
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