Properties of good building brick : For construction purpose, good building bricks should have the following properties.
No.1) The bricks should be table-moulded and kiln burnt Moreover they must be free from cracks and mus have regular shape with sharp edges.
No.2) The bricks must produce a clear ringing sound when struck win each other.
No.3) These bricks when broken or fractured should show a bright homogeneous and uniform structure free 2. from voids 3.
No.4) The bricks should be hard enough so that no impression is let on the surface when scratched with nail or finger.
No.5) when immersed in water for 24 hours , the bricks should not absorb water more than 20 % by weight for first class bricks and 22 % by weight for second class bricks .
The brick should not break into pieces when dropped on a flat hard ground from a height of one meter.
No.6) The brick should have low thermal conductivity and they should be sound proot .
No.7) When soaked in water for 24 hours, the bricksshould not show patches of white sats when dred in shade.
CLASAIFICATION OF BRICKS:
Classification of bricks: For construction purpose, bricks are classified into the following categories:
No.1) First class bricks: These are table-moulded, kiln burnt bricks with sharp edges and standard shape. These are burnt in kilns. These are used in superior quality permanent type constructions.
No.2) Second class bricks: These are ground-moulded, kin burnt bricks wih slightly iregular shape. These bricks may have hair cracks and their edges are not so sharp. These are used where a coat of plaster is to be provided.
No.3) Third class bricks: These are ground-moulded, clamp burnt bricks. These are not hard and have rough surfaces with irregular edges. These are used at places where the rainfallis not heavy and for other temporary type of constructions rth class bricks: These are over-burnt bricks with iregular shape and are dark coloured.These have a compact structure. These are generally used as aggregates for concrete to be used in foundations roads etc.
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