water absorption test on brick

Water Absorption Test On Brick | Lab Procedure


Water Absorption test on brick is conducted to determine the moisture absorbed by the bricks when subjected to extreme conditions. The absorption test can be used as an indicator of the durability properties of bricks such as quality, degree of burning and behaviour of bricks in weathering.


Water Absorption Test On Brick

The test can be briefly explained as follows:


Apparatus Required

1. A ventilated oven

2. A weighing balance with a sensitivity of less than 0.1%

3. Sample of whole bricks


Lab Procedure

The procedure for the absorption test on bricks includes the following series of steps:

i. The brick specimen is first dried in the ventilated oven at a temperature ranging from 105 degree Celsius to 115 degree Celsius until the specimen attains a constant mass.

ii. The heated specimen is then allowed to cool at room temperature.

iii. The specimen is weighed and its mass is recorded ( M1).

iv. Then, the specimen is immersed in water at a temperature of about 27 degree Celsius for 24 hours.

v. The brick specimen is taken out from the water and wiped with a clean cloth to remove the traces of water that may be present.

vi. The specimen thus obtained is then weighed (M2).


Calculation of Water Absorption of Bricks

Water absorption by the brick specimen is given by the formula,

Water Absorption of Bricks

The average result shall be reported.


M2 = Wet Weight of brick after immersion of brick in water for 24 hours
M1 = Dry Weight after oven drying of brick at 105-110 deg. C



Water absorption of the given bricks = ………….%

Water Absorption Test on Brick – Table 

After the water absorption test on brick; the obtained value should not be more than 20% for first-class brick, 22% for second-class brick and 25% for third-class brick.

 S.N.                         Brick Class  The maximum water absorption percentage
1.                          First       20%
2.                          Second       22%
3.                           Third       25%
4. Heavy-duty machine made bricks        5%



Read Also: Tests on Brick


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