Bricks
Bricks are block of tempered clay by plastic moulded to suitable shapes.
they are dried in Sun and then burnt therefore as to make them strong hard and durable.
the standard size of bricks are 19 cm x 9 cm x 4 cm or 19 cm x 9 cm x 9 cm.
the specific gravity of bricks is about 2.
the no. of bricks contain for one cubic metre of brick masonry are 550.
Classification of Bricks
1.) First-Class Brick
in this bricks are well burnt having smooth and even surface with perfect rectangular shape and uniform reddish colour.
these bricks should not absorb water more than 20% of its own dry weight after 24 hours immersion in water.
it should have a minimum crushing strength of 10.5 MN/m^2.
2.) Second Class Bricks ЁЯз▒
the second Class Bricks are slightly over burnt having rough surface and not perfectly rectangular in shape.
these bricks should not absorb water more than 22% of its own dry weight after 24 hours immersion in water.
3.) Third Class Bricks
Third Class Bricks are not properly burnt (under burnt) in the kiln and hence these are soft and can be easily broken.
these bricks should not absorb water more than 25% of its own dry weight after 24 hours immersion in water.
4.) Jhama Bricks
Jhama bricks are over burnt with irregular shape.
these bricks are dark bluish in colour.
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