The ratio of minimum compressive strength on 15 cm cubes prepared with the concrete of M 20 grade and M 40 grade, at 7 days should be at least
A. 1/3
B. 1/2
C. 3/2
D. 2.0
Answer:B
The ratio of minimum compressive strength on 15 cm cubes prepared with the concrete of M 20 grade and M 40 grade, at 7 days should be at least
A. 1/3 B. 1/2 C. 3/2 D. 2.0