Which one of the following slows down or retards the setting action of cement
A
Sulphur trioxide
No worries! We‘ve got your back. Try BYJU‘S free classes today!
B
Alkaline
No worries! We‘ve got your back. Try BYJU‘S free classes today!
C
Calcium sulphate
Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses
D
Magnesia
No worries! We‘ve got your back. Try BYJU‘S free classes today!
Open in App
Solution
The correct option is C Calcium sulphate The retarder is an admixture that slows down the chemical process of hydration so that concrete remains plastic and workable for a longer time than concrete without the retarder. Gypsum (Calcium sulphate) is used as grouting to retard the setting time.