Discussion
Assertion : Rapid hardening cement is prefabricated concrete construction and road works.
Reason : With the same water, cement ratio at a fixed day of application strength of rapid hardening cement is more than ordinary portland cement.
Answer: A
Both statements are correct, so the answer is Both Assertion and Reason are correct.
Rapid hardening cement, made with a higher tricalcium silicate content and finer grinding, gains strength faster than ordinary Portland cement. It is therefore used where early strength is needed, as in prefabricated concrete units and road works that must reopen quickly, which is what the Assertion, worded loosely, says.
The Reason states the defining property: at the same water-cement ratio and the same age, rapid hardening cement develops a higher strength than ordinary Portland cement, for example its 3-day strength is about that of OPC at 7 days. Neither statement is false, so the other options fail.
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