Gypsum used in cement manufacturing acts as a/an-
Retarder
Therefore, gypsum acts as a **retarder** for the setting of cement. Based on the function of controlling the setting time by slowing down the initial hydration of tricalcium aluminate, gypsum acts as a retarder in cement manufacturing.
Important Questions from Cement
Refractory cement is rich in
The ______ in excess makes the cement unsound and causes the cement to expand and disintegrate
Match the apparatus for conduct of test in List 1 with the property of cement in List 2.
List 1
List 2
A. Vicat’s apparatus test
1. Soundness test
B. Le-Chatelier’s apparatus
2. Fineness
C. Briquette test method
3. Setting time
D. Air permeability method
4. Tensile strength
The cement becomes useless if its absorbed moisture content exceeds
In ordinary cement, about 99% of its final strength is achieved in _____.
