This test method allows to evaluate the value of bulk density of hardened and dried mortar. This value is obtained as the ratio between the mass of sample after drying in oven and the volume that it occupies when it is immersed in saturation conditions. The test is performed on three prismatic samples of dimensions 40mmx40mmx160mm.
First of all, to perform the test it is necessary to dry the sample in an oven at temperature of (70 ± 5)°C, until achieving constant mass. The sample reached constant mass when, as between two successive weighings made at intervals of 2 hours, there is a difference in mass upper to 0.2%. The dried samples are weighed and their mass must be recorded in kilograms with accuracy of 0.1%. The hardened mass mortar sample is indicated by the symbol ms, dry.
Each sample is then immersed in water at (20 ± 2 temperatures)°C until there are increments of mass within 15 minutes. The value of the mass must be recorded in kg with a precision of 0.1%. It represents the value to be attributed to the symbol ms, sat. Carried out this measure, we proceed with recording the mass value of the sample in immersed position ms, j. Using the mass of the saturated sample of hardened mortar ms, sat and the mass of the saturated hardened mortar sample immersed in water ms,j, you can determine the volume occupied by the sample. This value is calculated by the method which refers to the displacement in accordance with the VS = (ms formula, sat-ms, j)/ρw, in which the ρw symbol indicates the specific weight of water. Calculated the volume of each sample it is possible to proceed to determination of bulk density of each sample by the ratio between the mass recorded ms, dry and the volume VS. The final value is obtained from the arithmetic mean of the three bulk density values ​​calculated on individual three samples.

 

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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restoring mortars EN 1504-3
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grouting mortars EN 13888
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surface protection mortars EN 1504-2
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Method to determine adhesion between plaster mortar and support.