1.
First class Bricks:
see more topic 👇
Size and Weight of Bricks.
composition of bricks.
harmful ingredients in bricks.
classification of bricks.
Brick Manufacturing.
Testing of Brick.
➤ These
bricks are table moulded & they are burnt in kilns.
➤ These
are thoroughly burnt & are of deep red, cherry or copper colour.
➤ Surface
should be smooth & rectangular, with parallel, sharp & straight edges
&
square corners.
➤ It
should be free from flaws, cracks & stones.
➤ It
should have uniform texture.
➤ No
impression should be left on the brick when a scratch is
made by a finger nail.
➤ Fractured
surface of the brick should not show lumps of lime.
➤ Metallic
or ringing sound should come when two bricks are struck
against each
other.
➤ First
class bricks are recommended for pointing, exposed face work in masonry structures,
flooring & reinforced brick work.
➤ Water
absorption = 12.5% of its dry weight when
immersed in cold water for
24 hours is allowed.
➤ Crushing
strength ≥ 10 N/mm².
2.
Second Class Bricks:
➤ These
bricks have same requirements as first class brick except for the one’s listed
below.
➤ These
bricks are ground moulded & they are burnt in kilns.
➤ Small
cracks & distortions are permitted.
➤ Second
class bricks are recommended for all important or unimportant hidden masonry
works & centering of reinforced brick & reinforced cement concrete (RCC)
structures.
➤ Water
absorption = 16-20 % of its dry weight is
allowed.
➤ Crushing
strength ≥ 7 N/mm².
3.
Third Class Bricks:
➤ These
bricks are ground-moulded & they are burnt in clamps.
➤ These
bricks are soft & reddish yellow coloured.
➤ Produce
a dull sound when struck with each other.
➤ These
bricks are used for unimportant & temporary structures & at places where
rainfall is not heavy.
➤ Water
absorption = 25 % of dry weight is
allowed.
➤ These
have rough surface with irregular & distorted edges.
4.
Fourth Class Bricks (Zhama Bricks):
➤ These
bricks are over burnt & badly distorted in shape &
size & are brittle in
nature.
➤ Ballast
of such brick is used for foundation & floors in lime concrete & road metal,
because of fact that own burnt bricks have a compact structure & hence they are sometimes
found to be stronger than even first class bricks.
see more topic 👇
Size and Weight of Bricks.
composition of bricks.
harmful ingredients in bricks.
classification of bricks.
Brick Manufacturing.
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