Can any one explains the true reason behind checking the concrete for compressive strength on 28th day.why not 27th 29th or 30th day.i am not looking for a answer like it attain strength of 99%on 28th day etc.it should have valid reasons.even though I am more than 40 years experience in construction I am not aware the reason
Today I read a article on the above subject.i want to cross check the same with our learned members
Today I read a article on the above subject.i want to cross check the same with our learned members