Some brick is taken also it is weighed dry. It is then immersed in water for 16 hours. That is weighed again and the variation in weight indicates some amount of water absorbed through the brick. It should not exceed 20 per-cent of the weight of a dry brick.
Compressive/Crushing strength of Bricks
Every crushing strength about brick is found excuse by placing it in a compression testing machine. That is pressed till this breaks.
The soluble salts, cause efflorescence on the surface of bricks.
For finding out the presence of soluble salts in brick, it is immersed in water for 24 hours. This is then taken out also allowed to dry into the shade.
The Presence of white deposits indicates the presence of soluble salts.
For this purpose, 20 bricks of standard size 19cm x 9cm x 9cm are selected at random and they are stacked lengthwise along the width and along with the height.
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