Classification of Bricks Based on their Quality
The bricks used in construction are classified as following:
First Class Bricks: These bricks are of standard size and shape. They are burnt in kilns. They complete all desirable properties of bricks.
Second Class Bricks: These bricks are ground moulded and burnt in kilns. The edges cannot be uniform and sharp. The surface can be somewhat rough. Such bricks are normally used for the construction of walls which are going to be plastered.
Third Class Bricks: These bricks are ground moulded and burnt in clamps. Their edges are somewhat distorted. They generate dull sound whenever struck together. They are utilized for temporary and unimportant structures.
Fourth Class Bricks: These are the over burnt bricks. They are dark in color. Their shape is irregular. They used as aggregates for concrete in, floors, foundations and roads.