BRICKS

Quality of good Bricks:-

          Brick should be copper colored. Color should be uniform and bright.

          They should be uniform in size.

          It should be free from crack.

          When struck together it should produce ringing sound.

          They should be sufficiently hard.

          On soaking in water for 24hrs there should be no salt deposits seen on the block.

          If dropped from the height of one meters it should not be break in pieces.

SIZE:- in the most part of the in India the actual size of brick is 19cm x 9cm x 9cm, and nominal size is 20cm x 10cm x 10cm. The nominal size includes the joining of mortar between the bricks. Part of top surface of rick is lowered which is called frog.

Standardization of brick:-

As per BIS : 1077-1957, the minimum crushing strength of brick is 3.5N/mm2.

“A” grade bricks :- crushing strength between 7to 14 N/mm2.

“B” grade bricks :- crushing strength above 14N/mm2.

The color of brick varies due to com-positional difference in clay.

Shapes of bricks :-

       Bull-nose brick :- a brick moulded with a round end.

       Channel brick :- brick moulded in the shape of gutter or channel and are used for drain etc.

       Coping brick :- thickness of these bricks corresponds with that of wall on which coping is to be provided.

       Cow-nose brick :- a brick with double bull-nose end.

Hollow brick :- these are hollow from within and are also called cavity or cellular bricks.

Paving brick :- these bricks containing more amount of iron to provide more strength for   traffic loads.

Perforated brick:- these bricks contain cylindrical holes thus useful for light weight construction.

Substitute for brick :-

Concrete block

Fly ash brick

Sand lime or calcium silicate brick