Gneiss is chemically classified as

A good refractory brick should withstand high temperature. It should also have low coefficient of expansion and contract…

The commonly base used in a paint is

The addition of pozzolana to Portland cement causes

The compressive strength of felspar is

The bricks after burning in kilns require about

The density of concrete

Le-chatelier method is used to determine

The percentage of alumina in a good brick clay should vary from