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In case of absorption test on burnt clay building bricks as per IS 3495 (part 2);1992, bricks shall be soaked in cold water for a duration of______.
16 hours
9 hours
12 hours
24 hours
24 hours
According to IS 3495 (Part 2): 1992, the water absorption test requires bricks to be immersed in clean water at a temperature of 27┬▒2┬░C for a period of 24 hours. This saturation period ensures that the bricks reach their maximum potential water absorption capacity under standard atmospheric pressure.
IS 3495 (Part 2): 1992
According to IS 3495 (Part 2): 1992, the water absorption test requires bricks to be immersed in clean water at a temperature of 27┬▒2┬░C for a period of 24 hours. This saturation period ensures that the bricks reach their maximum potential water absorption capacity under standard atmospheric pressure.
Water┬аAbsorption┬а(%)=WdтАЛWsтАЛтИТWdтАЛтАЛ├Ч100 тАФ where WsтАЛ is the saturated weight and WdтАЛ is the dry weight.
The test measures the volume of pores within the brick structure that are accessible to water. By soaking for 24 hours, capillary action fills the interconnected pores within the brick, allowing for the calculation of percentage water absorption based on the difference between the dry weight and the saturated weight.
The bricks must be oven-dried at 105┬░C to 115┬░C before determining the initial dry weight.
The cooling process before initial weighing must occur in a desiccator or similar environment.
Water absorption is a key indicator of the durability and porosity of building bricks.
For common burnt clay bricks, the average water absorption should not exceed 20% by weight.
Simple and easy to conduct in standard laboratory setups.
Reliable indicator of brick strength and weathering resistance.
Requires a significant time duration of at least 24 hours for soaking plus oven drying time.
Does not account for water absorption under pressure or vacuum conditions.
Quality control in brick manufacturing industries.
Field testing for acceptance of materials at construction sites.
Temperature of water for soaking is maintained strictly at 27┬▒2┬░C.
Other time durations like 9,12, or 16 hours are not prescribed for the standard water absorption test in IS 3495.
D is correct тАФ As per IS 3495 (Part 2): 1992, burnt clay building bricks must be immersed in water for 24 hours to determine their water absorption capacity.
Remember that IS 3495 is divided into 4 parts; Part 1 covers compressive strength, Part 2 covers water absorption, Part 3 covers efflorescence, and Part 4 covers warpage. These are frequently asked in competitive exams.
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