Which time we can use core test?

Thank you for the invitation

to be a concrete sample test several times so we can see the resistance to pressure and be on the second day of pouring concrete, third, seventh and fourteenth and twenty one twenty-eighth to reach maximum resistance

This test is used after the failure of the results of the examination of compressive strength of 28-day concrete samples, after which the hammer test is used, the results of which are inaccurate and can be considered as a predictor for the results of our core test

Thank you for the invitation

Agreed with colleagues

With greetings and appreciation

when concrete cylinders (Average of three) did not achieve required concrete compressive strength then cores are taken(Average of three) and shall be min 85% of reuired concrete strength. The individual shall not be less than 75% of reuired concrete strength.

Since 09:30 to until  12:30