Q:
What is 3,000 pound concrete?
A:
It is concrete that is strong enough to carry a compressive stress of 3,000 psi (20.7 MPa) at 28 days.
Concrete may be specified at other strengths as well. Conventional concrete has strengths of 7,000 psi or less; concrete with strengths between 7,000 and 14,500 psi is considered high-strength concrete.
