Which of the following imparts greenish grey colourto cement?
A. Calcium silicate
B. Calcium aluminate
C. Calcium aluminate ferrite
D. Calcium carbonate
Answer:C
Which of the following imparts greenish grey colourto cement?
A. Calcium silicate B. Calcium aluminate C. Calcium aluminate ferrite D. Calcium carbonate
Explanation: Calcium silicate and calcium aluminate are pure white minerals. Calcium aluminate ferrite is brown in colour, but due to absorption of light by magnesium, present as an impurity, greenish grey colouris imparted to cement.