The test is to assess the height of wet part of the mortar sample after the absorption due to capillary action test on the sample itself.
The test is carried out on three prismatic sample 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 the samples will prepare for a sufficient layer of a suitable sealant material capable to endure at temperature specified below; the material must 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 dampness. The samples, in fact, must 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, at 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 should 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, it quickly dries their surface with a damp cloth and weighed the same. By weight values ​​you are able to obtain the absorption coefficient, which corresponds to the slope of the straight line joining the points representing the measurements made in the time intervals.

Once this measure is performed each sample is broken in the sense of the length to obtain pieces of size approximately 80 mm x 40 mm x 20 mm. It then proceeds with the measurement of the penetration depth of water to the middle of the sample parallel to the 80 mm dimension, with accuracy of 1 mm.

 

Material type Standard Test method
finishing plasters EN 998-1
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gypsum-based plasters EN 13279-1
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screeds EN 13813
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self-levelings EN 13813
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grouting mortars EN 13888
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surface protection mortars EN 1504-2
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Instruments used to perform the test: Vernier caliper

 

The test is performed to assess the wet part (ie the wetted part of the sample).The test is performed to assess the wet part (ie the wetted part of the sample).

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