Light earth performances for thermal insulation: application to Earth-Hemp

T Vinceslas (1) , Thibaut Colinart (1) , Erwan Hamard (2) , Arthur Hellouin de Menibus (3) , Thibaut Lecompte (1) , Hélène Lenormand (4)

1 UBS Lorient - Université de Bretagne Sud - Lorient
2 IFSTTAR/MAST/GPEM - Granulats et Procédés d'Elaboration des Matériaux
3 Eco-Pertica
4 UniLaSalle

The present study aims to evaluate the impacts of raw materials variability (earth and hemp) on hemp-earth performances. This work is performed in the framework of the ECO-TERRA R&D project in collaboration with four French research laboratories, short circuit hemp producers and craftsmen specialized in hemp and earth constructions. This article is focused on the thermal conductivity, and mention preliminary results of the mechanical characterizations. The results are compared to lime-hemp materials, one of the most studied bio-based concrete for thermal insulation in R&D programs. The typical volumetric mass of a dry lime-hemp mixture is about 330 to 400 kg/m3, which corresponds to a thermal conductivity about » = 0,11 W.m-1.K-1 (measured with hot plates, at 20°C and 50% relative humidity).

Mots clés: DRYING PATH; EARTH-HEMP; HEMP; LIGHT-EARTH; RAW EARTH; THERMAL CONDUCTIVITY

Mots clés: MATERIAU; TERRE VEGETALE; CONDUCTIVITE THERMIQUE

Domaines: Matériaux

T Vinceslas, Thibaut Colinart, Erwan Hamard, Arthur Hellouin de Menibus, Thibaut Lecompte, et al.. Light earth performances for thermal insulation: application to Earth-Hemp. 2nd International Conference on Bio-based Building Materials and 1st Conference on ECOlogical valorisation of GRAnular and FIbrous materials, Jun 2017, CLERMONT-FERRAND, France. pp. 1-7. ⟨hal-01744431⟩