TIME-DEPENDENT MOISTURE PROPERTIES FOR PLASTERBOARD WITH SURFACE COATING

摘要

The level and fluctuations of indoor humidity plays an important role for the indoor air quality. The buffering effect of the internal surfaces in the building has been more emphasized lately. This study focus on the buffering effects for short time periods (hours, days) since the surface materials at this time scale may play a significant role. The objective is to determine the time-dependent moisture properties of plasterboard for indoor use and the different layers of a dispersion paint surface coating system. The effect of moistening and drying is studied in the interval RH 33―54% (+20°C). The surfaces step-response was determined through a gra-vimetrical method while the sample was in a well-defined relative humidity (RH). Calculated values for the moisture capacity, ξ, together with an evaluation of the experimental data are presented. The experimental results have a satisfying agreement compared with the calculations.