To determine the water absorption of burnt clay

To determine the water absorption of burnt clay

OBJECTIVE:- To determine the water absorption of burnt clay building Bricks.

APPARATUS:- A sensitive balance capable of weighing within 0.1 percent of the mass of the specimen and a ventilated Oven.

THEORY:- Bricks for external use must be capable of preventing rain water from passing through them to the inside the walls of reasonable thickness. A good brick should absorb water maximum 1 th of the weight of the brick.

PROCEDURE:-

1. Take 5 Bricks and dry in a ventilated oven at a temperature of 105 to 1150c till it attains substantially constant mass.

2. Cool the specimen to room temperature and obtain its weight (w1). Specimen warm to touch shall not be used for the purpose.

3. Immerse completely dry specimen in clean water at a temperature of 270 ± 20c for 24 hours.

4. Remove the specimen and wipe out any traces of water with a damp cloth and weigh the specimen (W2).

5. Complete the weighing within three minutes after the specimen has been removed from water.

6. Water absorption , percent by mass, after 24 hours, % water absorption is given by formula = W2 – W1 / W1 X 100

OBSEVATION TABLE:

I.S. Requirement:-

After immersion in cold water for 24 hours, the average water absorption of the bricks shall not be more than 20% by weight up to class 125 and 15% by weight for higher classes.

RESULT:-

 The moisture content of the given sample of brick is ……%

CONCLUSION:-

The given sample can be used / cannot be used as building

material

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