Question

The choice of cement for high-strength concrete should not be based only on mortar-cube tests but it should also include tests of compressive strengths of concrete at ___________ days.

(a) 28, 56, 91

(b) 28, 60, 90

(c) 30, 60, 90

(d) 30, 45, 60

The question was posed to me in an online interview.

My question comes from HPC in division Strength of Concrete of Concrete Technology

Answer 1

Right choice is (a) 28, 56, 91

Best explanation: The choice of cement for high-strength concrete should not be based only on mortar-cube tests but it should also include tests of compressive strengths of concrete at 28, 56, and 91 days.