During the setting action of the cement, tricalcium aluminate is formed within ____ after adding water to the cement.

The percentage content of water and calcium sulphate in gypsum is ___ and ___ respectively.

Which of the following is not a synthetic abrasive?

Which of the following statements about liquid lubricants is false?

It results in the failure of concrete made from the cement if the amount of alkali oxides in it exceeds _____

The binding material present in asphalt is ______

The total alumina content in high alumina cement should not be less than ___

Calcium sulphate is present in ordinary cement in the form of ______