Rapid Hardening Cement (RHC) differs from OPC mainly in:
Choose the correct answer
Lower strength than OPC at 28 days
Higher C3S content and finer grinding for faster early strength gain
No gypsum in composition
It uses recycled materials only
Correct Answer
B. Higher C3S content and finer grinding for faster early strength gain
AI Detailed Explanation & IS Code Reference
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RHC (IS 8041): Higher C3S content and finer grinding → faster hydration → achieves in 3 days what OPC achieves in 28 days. 3-day strength of RHC ≈ 28-day strength of OPC. Higher heat of hydration. Used in: cold weather concreting, quick repair, precast units, removal of formwork early. NOT for mass concrete (high heat).
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