Civil Engineering MCQJE Level Civil Engineering
Water-cement ratio for M25 concrete in moderate exposure (IS 456, Table 5) should NOT exceed:
RCCRCCMEDIUM
Choose the correct answer
A
0.55
B
0.50
C
0.45
D
0.60
Correct Answer
B. 0.50
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IS 456 Table 5: For M25 concrete in moderate exposure: max w/c ratio = 0.50. For mild: 0.55; severe: 0.45; very severe: 0.45; extreme: 0.40. Lower w/c → less permeable → better durability. Min cement content also specified: 300 kg/m³ for moderate, 320 kg/m³ for severe.
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