How to calculate compressive strength of concrete?

Answer Posted / bhausaheb mane

Cast the cube moulds of size of (150mmx150mmx150mm)
after curing period of 3,7,28 days test under compressive
testing machine.then caclculate result by using formula

Compressive strength =load in newton/Area of cube in mm2
(150x150)

generally compressive testing machine shows load in
Kilonewton so we required Kilonewton convert in to the
Newton.by multiplying kN X 1000 (1N = 1000 kN)

e.g.
load by machine 300 kN/Area of cube 22500mm2

Load in newton 300x1000/22500mm2=13.33 N/mm2

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