Effect of Temperature on Moisture Buffering of Hemp Concrete
Résumé
Hemp concrete is a bio-based building material made of hemp shiv and lime. This material is not used as load-bearing due to low mechanical properties. Hemp concrete is thus mainly used as filling material associated to a wooden structure. The indoor side of the wall can be coated or not. On hygrothermal point of view, hemp concrete shows low thermal conductivity, about 0.1 W/m/K, and can be used without added insulation layer in buildings. The hydric characterization of hemp concrete shows high transfer and storage capacities.
Thus, this study deals with hydric characterization of hemp concrete under dynamic conditions. The experimental method is based on the NORDTEST protocol where specimens are exposed to daily cyclic variation of relative humidity. Generally, hygrothermal characterization is held at 23°C. This study deals with the impact of temperature on moisture buffer value of hemp concrete. Several temperatures are investigated from 11°C to 23°C. The results show that moisture buffer value increases with the temperature according an exponential law.