Sunday 23 September 2012

Types of Bricks



























  • There are three types of bricks,

    1. First Class Bricks
    2. Second Class Bricks
    3. Third Class Bricks
    Specification of First Class Bricks

    • Made of good earth which is free from saline deposits and are sand molded.
    • Burnt thoroughly without being vitrified and have deep red, cherry and copper color.
    • Regular and uniform in shape and size with sharp and square edges and parallel faces. 
    • Must be homogeneous in texture and emit a clear ringing sound on being struck together. 
    • Free from flaws, cracks, chops, stones and lime.
    • Should not absorb water more than 20% of its own dry weight after 24 hours, immersion in cold water.
    • Have a minimum crushing strength of 105 kg per sq. cm when tested according to the test.
    • Should not show appreciable sign of efflorescence either in dry state or subsequent to soaking in water.

    NOTE: As per guidelines of all wings of the Government, semi-Government departments and other construction departments, First Class Brick tiles should be used for construction works.

    Specification of Second Class Bricks

    • They shall be well burnt or slightly over burnt.
    • They must give clear ringing sound when struck.
    • The may have slight irregularities in size, shape and color.
    • They may have slight chips, flaws or surface crack but must be free from lime or kankar.
    • The minimum crushing strength of second class brick should be 70 kg per sq cm.

    Specification of Third Class Bricks

    • These bricks are slightly under burnt or over burnt.
    • They are not uniform in shape, size and edges.
    • They shall not observe water more than 25% of their own dry weight after 24 hours, immersion in cold water.
    • They have some signs of efflorescence.
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