Civil Engineering MCQAE Level Civil Engineering
Water content is 180 kg/m³ and cement content is 400 kg/m³. Water-cement ratio is
RCCOriginal practiceMEDIUM
Choose the correct answer
A
2.22
B
0.45
C
0.90
D
0.23
Correct Answer
B. 0.45
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Water-cement ratio (w/c) = mass of free water / mass of cement. Per Abrams' law (1919), concrete compressive strength is governed primarily by w/c for given materials. Lower w/c gives higher strength and durability. IS 456:2000 limits: max w/c = 0.55 (moderate), 0.50 (severe), 0.45 (very severe), 0.40 (extreme exposure). w/c = water/cement = 180/400=0.45.
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