Classification of Bricks Based on Building Process
Based on the building process Bricks are of the following kinds:
1. Unburnt Bricks: These are half-burnt bricks. The colour is yellow. The strength is low. They are used as suki in lime terracing. They are used as soiling under RCC footing or basement. Such bricks should not be exposed to rainwater.
2. Burnt Bricks: Burnt bricks are made by burning them in the kiln. First-class, Second Class, Third Class bricks are burnt bricks.
3. Over Burnt or Jhama Brick: It is often known as the vitrified brick as it is fired at high temperatures and for a longer period than conventional bricks. As a result, the shape is distorted. The absorption capacity is high. The strength is higher or equivalent to first class bricks. It is used as lime concrete for the foundation. It is also used as coarse aggregate in the concrete of slab and beam which will not come in contact with water.