classify the burnt clay brick
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Bricks are classified as following:
1) ON THE BASIS OF QUALITY: On the basis of quality bricks are classified as:
Sand Faced
Rustic
Multi Coloured
2) ON THE BASIS OF MANUFACTURE: On the basis of manufacture bricks are classified as:
Hand Moulded
Machine Moulded
3) ON THE BASIS OF UTILITY: On the basis of utility bricks are classified as:
First Class Bricks (Grade-A):>First class bricks are sound, well burnt in kilns, table-moulded and rectangular with sharp edges.
->Surface is clean, smooth and have no cracks.
->First class bricks are very hard.
->First class bricks are mainly used for face-worked structure or used for superior work.
Second Class Bricks (Grade-B):
->Second class bricks are burnt in clamps and ground-moulded but with little irregular in shape.
->Surface of bricks is rough and have spots.
->These bricks are hard.
->Second class bricks are mainly used for ordinary structures and also used at places where brick work is to be provided with plaster coat.
Third Class Bricks (Grade-C):
->Third class bricks are ground-moulded and burnt in clamps.
->Third class bricks have distorted edges.
->These bricks are slightly soft.
->These bricks are used for important and temporary structure and at place where rainfall is not heavy.
Fourth Class Bricks (Grade -D):
->Fourth class bricks are over burnt bricks.
->These bricks have irregular surface and dark colour.
->These bricks are very hard.
->These bricks are used as aggregates for concrete foundation, floors, roads etc..
PROPERTIES OF BURNT CLAY BRICKS
Following are the properties of good quality burnt clay bricks:
Colour of brick should be bright and uniform.
Bricks should have uniform shape and standard size.
Bricks should be free from voids.
Bricks should be well-burnt, copper-coloured or reddish in colour.
Bricks should be free form cracks and must have sharp edges.
When 2 bricks are struck with each other, it should give a metallic sound.
When bricks are soaked in water, it should not absorb more than 20% of its dry weight.
When bricks are dropped on a flat surface from a height of one metre it should not crush into pieces.
Burnt clay bricks should be hard. When it is scratched with finger nail, no impression should be left on brick surfaces.
Crushing strength of bricks must be greater than 5.5 N/mm2.
Bricks must have nil efflorescence.
Bricks must be sound proof and should have low thermal conductivity.