Question
Chemistry Question on GROUP 1 ELEMENTS
Gypsum is added to cement to
A
decrease the rate of setting of cement
B
increase the rate of setting of cement
C
bind the particles of calcium silicate
D
facilitate the formation of colloidal gel
Answer
decrease the rate of setting of cement
Explanation
Solution
Gypsum is added to decrease the rate of setting of cement and it converts fast setting tricalcium alyminate to calcium sulphoaluminate which sets slowly.