Abrams water-cement ratio law states that the strength of concrete is:
Choose the correct answer
Directly proportional to the water-cement ratio
Inversely proportional to the water-cement ratio (lower w/c = higher strength, for fully compacted concrete)
Independent of w/c ratio
Proportional to (w/c)^2
Correct Answer
B. Inversely proportional to the water-cement ratio (lower w/c = higher strength, for fully compacted concrete)
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Abrams law: f_c = A / B^(w/c), where A and B are empirical constants. Lower w/c = less water = denser paste = higher strength, BUT minimum w/c needed for full cement hydration is ~0.25 (theoretically). IS 456: maximum w/c for plain concrete = 0.55; for RCC in moderate exposure = 0.50.
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