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11 may 2021 work of brick 2.pdf

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11 may 2021 work of brick 2.pdf

  1. 1. 6. Alkalis – Alkalis are mainly salt of sodium(Na) and potassium (k) . It acts as a flux in the kiln and causes fusion , wraping and twisting of bricks . Alkalis absorb moisture from the atmosphere and cause dampness and efflorescence in bricks ( because of the presence of hygroscopic salts , e.g., CaCl2 , MgCl2 etc. ) 7. Pebbles , Stones and Gravels – Their presence does not allow through mixing of earth , thus the brick produced are weaker . Such bricks cannot be broken at the desired section and they break very irregularly . 8. Iron pyrites – Iron causes crystallization and disintegration of brick while burning . discolors bricks in the form of black slag. Q4 – Explain its size ? Ans – Normal size of brick Length * Breadth * Heigth 230mm * 115mm * 75mm Standard Size of Brick in inches
  2. 2. Length * Breadth * Height 190mm * 90mm * 90mm Q5- Explain its Properties of bricks ? Ans – Properties of bricks are : - 1.Hardness 2. Compressive Stength 3. Absorption 4. Frost resistance 5. Efflorescence 6. Sulphate attack on mortars and renderings Q6 – Explain its classification of bricks ? Ans- Classification of Bricks – #1. Classification of Bricks : Based on shape . Squint Brick . Splay Brick . Coping Brick . Bull Nose Brick . Cownose Brick
  3. 3. . Perforated Bricks . Hollow Bricks #2. Classification of bricks : Based on Quality . First Class . Second Class . Third Class . Fourth Class #3. Classification of bricks : Based on their using . Common Bricks . Engineering Bricks #4. Classification of Bricks : Based on raw material . Common Burnt clay bricks . Sand lime Bricks . Fly ash clay Bricks . Concrete Bricks . Fire Bricks #5. Classification of Bricks : Based on building process . Unburnt Bricks
  4. 4. . Burnt Bricks #6. Classification of Bricks : Based on manufacturing method . Ground moulded bricks . Table moulded bricks . Machine moulded bricks

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