IS 456 Table 5 specifies the minimum cement content for M25 concrete in moderate exposure as:
Choose the correct answer
200 kg/m³
300 kg/m³ for M25 in moderate exposure
400 kg/m³
No minimum specified for M25
Correct Answer
B. 300 kg/m³ for M25 in moderate exposure
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IS 456 Table 5: For Moderate exposure, M25 concrete: min cement = 300 kg/m³, max w/c = 0.50. For Severe: min 320 kg/m³, w/c 0.45 for M30. For Very severe: 340 kg/m³, w/c 0.45, M35. For Extreme: 360 kg/m³, w/c 0.40, M40. Minimum cement ensures durability not just strength.
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