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Hygric and thermal properties of hemp-lime plasters

Abstract : Hemp-lime mortars are generally used as indoor insulating plasters of building envelopes. They can be applied in thick coat to allow high enough hygrothermal performances to be reached in retrofit case. This study investigates hygric and thermal properties of two hemp-lime plasters. These plasters are made with the same lime-based binder and differ from their kind of hemp shiv. The two kinds of hemp shiv are defibered but one is smaller than the other. This experimental study is based on the measurement of sorption isotherm, water vapour permeability, moisture buffer value and thermal properties (conductivity and diffusivity). The effect of temperature on moisture buffer value and on thermal properties is also investigated. It is shown that hemp-lime plasters are hygroscopic and breathable materials. They are good hygric regulators according to the Nordtest classification and their moisture buffering ability is slightly impacted by temperature in the range from 11° to 23°C. The hemp-lime plaster with the smallest hemp
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Submitted on : Wednesday, January 6, 2016 - 11:43:12 AM
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Brahim Mazhoud, Florence Collet, Sylvie Pretot, Julien Chamoin. Hygric and thermal properties of hemp-lime plasters. Building and Environment, Elsevier, 2016, 96, pp.206-216. ⟨10.1016/j.buildenv.2015.11.013⟩. ⟨hal-01251467⟩



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