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Q: The optimum water cement ratio for 1 : 2 : 4 concrete is around
  • A. 0.75
  • B. 0.60
  • C. 0.45
  • D. 0.30
Correct Answer: Option B - w/c for nominal mix proportion (1 : 2: 4) M15 grade of concrete used in PCC around 0.6 and if it is RCC mix proportion (1:1.5:3) then the w/c should be 0.55.
B. w/c for nominal mix proportion (1 : 2: 4) M15 grade of concrete used in PCC around 0.6 and if it is RCC mix proportion (1:1.5:3) then the w/c should be 0.55.

Explanations:

w/c for nominal mix proportion (1 : 2: 4) M15 grade of concrete used in PCC around 0.6 and if it is RCC mix proportion (1:1.5:3) then the w/c should be 0.55.