GATE Architecture/Planning 2016

Question : GATE 1992 

 The following compound of cement contributes most to the strength of concrete:

(A)       Calcium Aluminate

(B)       Dicalcium Silicate

(C)       Tricalcium Silicate 

(D)       Gypsum

Answer: (C) Tricalcium Silicate

·         Dicalcium aluminate gives initial strength and hardness to concrete.

·         Tricalcium aluminate gives strength after one week and contributes to maximum strength.

·         Gypsum retards the setting time of concrete.

source: GATE Architecture/Planning by B K Das available on amazon.in