Initial setting of cement is caused due to
A. Tri-calcium silicate
B. Di-calcium silicate
C. Tri-calcium aluminate
D. Tetra calcium alumino ferrite
Answer: Option C
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Initial setting is primarily due to the rapid reaction of C₃A with water (its reaction is controlled by the addition of gypsum).
Final setting is mainly due to the hydration of Tricalcium silicate (C₃S).
C3s is option 1 is correct
C3s is a used for IST