The test consists to determine water absorption coefficient due to capillary action on prismatic samples. The test is carried out on three prismatic samples of size 40 mm x 40 mm x 160 mm. Let them to cure within a curing cabinet at controlled temperature and humidity respectively of 21 ± 2 ° C and 60 ± 10%, for a period of 28 days. After the curing stage it is possible to prepare the samples through the pouring of a suitable sealant material capable to endure at temperature below specified; the material should be applied to the long faces of the samples tested. The coated samples are broken in half and placed inside a ventilated oven in order to dry and make them lose the residual damp. The samples, in fact, should be dried to constant mass at (60 +/- temperature 5)°C; The constant mass shall be deemed attained if two successive weightings, far between 24 h during drying, do not differ by more than 0.2% of the total mass.
After making all the preliminary operations, the samples are placed in water, inside a bowl, to a variable depth from 5 mm to 10 mm, with the broken faces of the prisms down and kept at a distance from the base of bowl, through appropriate support. To ensure the complete immersion of the samples with rough surfaces, avoiding the entrapment of air bubbles, it is appropriate to immerse them with tilted alignment. It is important to keep the water level constant for the whole test, covering the bowl to prevent evaporation of water from the wet samples.
At specific time intervals depending on the type of mortar that is being analyzed (for example, 10 minutes, 90 minutes, 24 hours), the samples are removed from the bowl, their surface is quickly dries with a damp cloth and they are weighed. By weight values ​​you are able to obtain water absorption coefficient due to capillary action, which corresponds to the slope of the straight line joining the points representing the measurements made in time intervals.

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Material type Standard Test method
finishing plasters EN 998-1
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gypsum-based plasters EN 13279-1
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skim coats EN 998-1
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self-levelings EN 13813
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waterproofing EN 14891
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surface protection mortars EN 1504-2
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The purpose of the test is to determine the water absorption coefficient due to capillary action.