The sum of the percentage of tricalcium silicate and dicalcium silicate for Portland cement varies from

Inert material of a cement concrete mix, is

Internal friction between the ingredients of concrete, is decreased by using

After casting, an ordinary cement concrete on drying

The sound absorption coefficient of light weight concrete is nearly ......than that of ordinary concrete.

For soundness test of cement we use

The resistance of an aggregate to compressive forces is known as

An aggregate is said to be flaky, if its least dimension is less than