GATE CE 2016 Set 1 — Question 20
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Question
The compound which is largely responsible for initial setting and early strength gain of Ordinary Portland Cement is
Correct answer
(B) C₃S
Solution
Tricalcium silicate () is responsible for the early strength of concrete (within 7 days). Tricalcium aluminate () is responsible for the initial setting (flash set). Since the question asks for both, and is the primary strength contributor, (B) is the most appropriate choice.
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