==>> CLASSIFICATION OF BRICKS==>>

==>> CLASSIFICATION OF BRICKS==>>

FIRST CLASS BRICKS==>>

1. These are thoroughly burnt and are of deep red, cherry or copper colour.
2. The surface should be smooth and rectangular, with parallel, sharp and straight edges
and square corners.
3. These should be free from flaws, cracks and stones.
4. These should have uniform texture.
5. No impression should be left on the brick when a scratch is made by a finger nail.
6. The fractured surface of the brick should not show lumps of lime.
7. A metallic or ringing sound should come when two bricks are struck against each other.
8. Water absorption should be 12–15% of its dry weight when immersed in cold water for
24 hours.
9. The crushing strength of the brick should not be less than 10 N/mm2. This limit varies
with different Government organizations around the country.
Uses: First class bricks are recommended for pointing, exposed face work in masonry
structures, flooring and reinforced brick work.

SECOND CLASS BRICKS==>>


  Are supposed to have the same requirements as the first class ones except that

1. Small cracks and distortions are permitted.
2. A little higher water absorption of about 16–20% of its dry weight is allowed.
3. The crushing strength should not be less than 7.0 N/mm2.
Uses: Second class bricks are recommended for all important or unimportant hidden masonry
works and centering of reinforced brick and reinforced cement concrete (RCC) structures.


THIRD CLASS BRICKS==>>

Are underburnt. They are soft and light-coloured producing a dull sound when struck against
each other. Water absorption is about 25 per cent of dry weight.

Uses : It is used for building temporary structures.

FORTH CLASS BRICKS==>>
Are overburnt and badly distorted in shape and size and are brittle in
nature.

Uses: The ballast of such bricks is used for foundation and floors in lime concrete and road
metal.

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