Abstract
The presence of water is one of the main decay factors in buildings. Capillary rise is the most important mechanism of water penetration into building materials in liquid phase. The free capillary water uptake experiment, used for the estimation of the capillary water absorption coefficient, a crucial materials property, is widely used for the characterization of building materials. The capillary water absorption coefficient was calculated according to three different European standards and recommendations. The three methods were compared in order to investigate which is the most appropriate for the calculation of the capillary water absorption coefficient. In addition, the effect of temperature on the estimation of the capillary water absorption coefficient of different building materials such as stones, bricks and mortars, was investigated for three different room temperatures (20, 25, 30 °C). From the results it was found a linear dependence between temperature T and the capillary water absorption coefficient.
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