Classification of Bricks | qualities | uses. - learn civil

Classification of Bricks Types | Qualities | Uses.

According to physical requirements bricks are classified as:

1) First class bricks
2) Second class bricks
3) Third class bricks
4) Fourth class bricks

1) First class bricks:


Classification of Bricks

The qualities of first class bricks are:

  • First class bricks are table moulded, well and uniformly burnt, deep red or copper coloured.
  • bricks are burnt in kilns
  • Size is exactly 190×90×90mm
  • The edges are square and sharp
  • These bricks have Uniform texture
  • The crushing strength should be about 10N/mm2
  • Water absorption should not be more than 20% after 24 hours of immersion
  • The bricks should produce clear metallic sound when struck with each other
  • The brick should not break when dropped from a 1-metre height.

Uses of first class bricks:

  • Used for superior work
  • Used for reinforced brickwork
  • Used for load-bearing walls.
  • Used for pavements and flooring.

2)Second class bricks:


Classification of Bricks

These bricks are ground moulded and they are burnt in kilns.

The qualities of second class bricks are:

  • The brick is well burnt
  • Water absorption is not more than 22% of its own weight after 24 hours of immersion
  • These bricks give a clear metallic ringing sound when struck with each other
  • This bricks should not show signs of efflorescence.
  • The shape and size should be uniform
  • The crushing strength should not be less than 7N/mm2

Uses of second class bricks:

  • Used in RCC work
  • Used for load bearing walls
  • These bricks are provided with a coat of plaster.


3)Third class bricks:
Classification of Bricks

These bricks are ground moulded and are burnt in clamps. These bricks are not properly burnt.


The qualities of third class bricks are:

  • These bricks are under burnt
  • These bricks are not hard and surface what is rough
  • They are soft and light coloured
  • They have much sign of efflorescence
  • They give a dull sound when struck with each other
  • The water absorption should not be more than 25%
  • They have a compressive strength of 3.5N/mm2
  • They do not have sharp edges and corners
  • The texture is not uniform.

Uses of third class bricks:

  • Used for in-important structure
  • Used for construction of walls of low height
  • Used in areas where rain is not heavy
  • Used for temporary structures.

4) Fourth class bricks:


Classification of Bricks

These are over burnt bricks with irregular shape and dark colour.


Qualities of fourth class bricks:

  • These bricks are a dark bluish colour
  • These bricks have compact structure
Uses: Used as aggregate for concrete in foundations. 


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