The presence of soluble salts causes efflorescence on the surface of the brick. Here also five test samples of bricks are taken at random. The brick is placed in a dish with 2.5 cm immersed in distilled water. The brick is allowed to absorb the water fully, and then the water evaporates through it. When the brick has dried, an additional and equal quantity of water is placed in the dish. As before the water is allowed to evaporate. After the second evaporation, the brick is examined and evaporated as under:
For general construction, bricks should not have more than slight to moderate efflorescence.
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