Water Absorption Test of burnt Clay Brick

Water absorption test is a very important test as it is testing the porosity of a brick. The more porous the brick, the more will be the absorption and the less will be the compressive strength.
This test is performed as per IS 3495 Part 2 with the help of an oven and a sensitive balance capable of weighing within 0.1% of the mass of the specimen.

Procedure:

1. Take the sample as per IS 5454, for the lot size in between 2001 and 10000, 5 bricks are taken as the sample. 
2. Dry the bricks in a ventilated oven at a temperature of $105-115^\circ{C}$.
3. Cool the bricks at room temperature and weigh them say, ${W}_{1}$.
4. Immerse the completely dried bricks in clean water at room temperature of $27\pm 2{}^\circ C$ for 24 hours.
5. Remove the bricks from water and wipe out any traces of water with a damp cloth and weigh them, say ${W}_{2}$. 

Water absorption,
$\frac{{W}_{2}-{W}_{1}}{{W}_{1}}\times{100}$
Water absorption should be less than 20% for first class bricks, 22% for second class bricks and 25% for third class bricks.

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