CLASSIFICATION OF BRICKS | CIVIL ENGINEERING ONLINE QUIZ

As per IS : 1077 - 1971, the classification and characteristic of bricks , are as tabulated under.

classification of bricks | civil engineering online quiz

classification of bricks

1.FIRST CLASS BRICKS

PROPERTIES:

These bricks are well burnt, having smooth and even surface, with perfect rectangular shape and uniform red dish color. when struck with other brick, these give a metallic ringing sound . these should not leave any mark when scratched by finger nail. these should not absorb water more than 20 percent of its own weight when immersed in cold water in 24 hours. when broken into two pieces these should a uniform compact structure. these show slight efflorescence.

where used:

these are used for good structures such as outer walls and facing work when no plastering is done. these are also used in floor and reinforced bricks slabs. such bricks should be laid in rich mortar.

2.SECOND CLASS BRICKS

PROPERTIES:

These are not perfectly rectangular in shape and are having rough surface, but are hard, slightly over burnt and uniform in color. these give ringing sound when struck with each other.water absorption should not be more than 22 percent by weight, when immersed in water for 24 hours. This shows slight efflorescence.

Where used:

These are used for internal walls, not exposed to atmosphere, these are used in facing work, which should be plastered. This cannot be used for R.B work. Such bricks may be laid in mud or lime mortar.

3. Third class brick

These bricks are not burnt properly in the kilns and may be slightly under/over- burnt, hence these are soft and can be easily broken. These are light red in color, with yellowish tinge. On striking, these do not give a ringing sound.These should not absorb more than 25% of water by weight when placed in cold water for 24 hours.Efflorescence in these bricks is moderate.

Where used:

These are used for inferior construction work, a letter places where there is less rainfall a presence of dampness.

4. JHAMA OR OVER BURNT BRICKS

PROPERTIES:

Due to excessive fusion and temperature bricks get over burnt, lose their shape and get twisted. This bricks yet dark bluish color.

Where used:

This breaks are not used in building construction. In the form of broken pieces, this may be used as road metal, also in foundation and flowers as soling material.