Crush the cubes to test their strength – When each cube is ready for testing, it is put into a concrete crusher. This machine exerts force onto the cube until it breaks. The rate at which it crushes is measured, and this is its compressive strength.
What size should the concrete cubes be?
Concrete cubes are typically made in moulds with dimensions of 150mm x 100mm x 150mm. The moulds have to meet the British Standard for testing hardened concrete (BS EN 12390-1:2000).
When should the cubes be tested?
The concrete should be tested after 7 days and after 28 days. That’s why 2 or 3 cubes are taken – so that the concrete can be measured after different lengths of time.