Question

For high-strength concrete, a cement should produce a minimum 7-days mortar-cube strength of approximately ___ MPa.

(a) 10

(b) 20

(c) 30

(d) 40

The question was asked during a job interview.

My query is from HPC topic in section Strength of Concrete of Concrete Technology

Answer 1

The correct choice is (c) 30

To explain: For high-strength concrete, a cement should produce a minimum 7-days mortar-cube strength of approximately 30 MPa.