The compound responsible for the initial setting of cement, is

When quarrying is to be done in hard stone and compact rocks, the usual method of quarrying is

The defect caused due to over-maturity and unventilated storage of the wood during its transit, is called

The slump test of concrete is used to measure its

The final setting time of ordinary cement should not be more than

The principal constituent of every kind of brick earth is alumina.

The time required for seasoning of timber in kilm seasoning is

Excess of silica in the clay

The bricks should be burnt at temperature from