Originally Posted by rotts4u
I worked in reinforced concrete for many years and never once saw concrete fail under compression. And, so, how do you think psi is tested? It's compressed until it shatters. The higher the psi mix the higher the compressive force needed to shatter it.
The issue at hand here is flexural strength. And that's why a good base is required under concrete driveways.............to reduce the flexural requirement.
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