Determination of Clay-Sand Plaster Hygrothermal Performance: Influence of Different Types of Clays on Sorption and Water Vapour Permeability
Eight different clay-sand plaster mixtures were studied. Mineral content and particle size distribution were estimated for all specimens. Hygroscopic sorption properties were determined (in climate chamber) at temperature of 23 ± 0.5 °C. The specimens were weighed at 1, 2, 3, 6, 12, 24 h until stabilisation at RH level of 30, 50 and 80% Moisture uptake (kg/m2) and moisture uptake rate kg/(m2h); moisture content and; points at sorption curve were monitored. There were large differences in sorption properties depending on clay type and plaster recipes. Total uptake of moisture at 30, 50 and 80% of RH for 2.5 cm plaster was 9.4–301.1, 17.5–465.9 and 41.6–744.9 g/m2 accordingly. Standard (EN 1015-19) procedure was followed. Water vapour diffusion equivalent air layer thickness Sd = 0.08–0.12 m was declared. Strong positive correlation was found between the amount of calcite and sorption properties of plasters.
KeywordsClay plaster Hygroscopic sorption Water vapour permeability Moisture buffering
This study was supported by Tartu College of TUT. Special thanks to Marko Kikas from Saviukumaja and Prof. Kalle Kirsimäe from Tartu University.
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