Determination of water absorption – of concrete as per BS 1881 – Part 122

Apparatus required:

1. A balance, capable of weighing the specimen up to5kg to an accuracy of 0.1%.

2. A suitable coring machine, with a cylindrical bit having an impregnated or set diamond cutting edge for cutting a 75± 3 mm diameter core.

3. A well ventilated drying oven, complying with BS 2648, except that the internal space may exceed 0.085 Cmtr, in which the temperature is controlled at 105 ± 5 Deg C, and such that the specimens can be placed in the oven

4. A tank at least 125 mm deep, containing clean water maintained at a temperature of 20± 1 Deg C

5. A dry air tight vessel, e.g. desiccator, of sufficient size to take the set of three specimens to be tested.

Specimen: Set of three specimens by coring from the full thickness of the concrete when this is between 32 mm and 150 mm, or by obtaining a core 75 mm long when the thickness of the specimen is greater than 150 mm. Concrete is 28 days to 32 days old at the time of testing, which means that drying of the specimens shall begin at an age of 24 days to 28 days.

Let see the animated video to understand the testing procedure:

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