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DETERMINATION OF EFFLORESCENCE OF BRICKS

Er. Parbhakar Dwivedi
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Aim: To determine the efflorescence of Burnt clay Bricks.

Apparatus: A shallow flat bottom dish containing sufficient distilled water to completely saturate the specimens. The dish shall be made of glass, porcelain or glazed stoneware and of size I80 mm x 18O mm X 40 mm depth for square shaped and 200 mm dia X 40 mm depth for cylindrical shaped.

Procedure:

  • Place the end of the bricks in the dish, the depth of immersion in water being 25 mm.
  • Place the whole arrangement in a warm (for example, 20 to 30°C) well ventilated room until all the water in the dish is absorbed by the specimens and the surplus water evaporates.
  • Cover the dish containing the brick with suitable glass cylinder so that excessive evaporation from the dish may not occur.
  • When the water has been absorbed and bricks appear to be dry, place a similar quantity of water in the dish and allow it to evaporate as before.
  • Examine the bricks for efflorescence after the second evaporation and report the results.

Report€“

The liability to efflorescence shall be reported as ‘nil’, ‘slight’, ‘moderate’, ‘heavy’ or ‘serious’ in accordance with the following definitions:

  • Nil: When there is no perceptible deposit of efflorescence.
  • SIight : When not more than 10 percent of the exposed area of the brick is covered with a thin deposit of salts.
  • Moderate: When there is a heavier deposit than under ‘slight’ and covering up to 50 percent of the exposed area of the brick surface but unaccompanied by powdering or flaking of the surface.
  • Heavy: When there is a heavy deposit of salts covering 50 percent or more of the exposed area of the brick surface but unaccompanied by powdering or flaking of the surface.

Serious: When there is a heavy deposit of salts accompanied by powdering and/or flaking of the exposed surfaces.

FORMAT FOR EFFLORESCENCE STATUS OF BRICKS IN SEPARATE TOPICS

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