Effect of coating on moisture buffering of hemp concrete
Résumé
This study deals with dynamic characterization of hydric behaviour of sprayed hemp concrete. In a first time, the study is held on the material itself. Then, the study considers systems made of coated sprayed hemp concrete for two kinds of coating. The measurement of moisture buffer value (MBV) is held according to the NORDTEST protocol (Rode, 2005). The experimental set-up is validated by comparison of moisture buffer value measured on cellular concrete with values given in the NORDTEST project for the same kind of material. Results show that sprayed hemp concrete has an excellent moisture buffer capacity (MBV=2.14 g/(m².%RH). So, it is an excellent hydric regulator that improves hygrothermal comfort and reduces energy needs. Once coated, hemp concrete remains good hygric regulator (for closed coating) and nearly excellent hygric regulator (with open coating). Also, the experimental data set can be used for benchmarking buffering models.