Title:
Performances of Hemp Concretes: from Microscopic to Functional Properties
Author(s):
Guillaume Delannoy, Sandrine Marceau, Philippe Glé, Etienne Gourlay, Marielle Guéguen-Minerbe, Dinarzed Diafi, Issam Nour, Sofiane Amziane, and Fabienne Farcas
Publication:
Symposium Paper
Volume:
320
Issue:
Appears on pages(s):
13.1-13.12
Keywords:
Biobased materials, building insulation, hemp concrete, porosity, functional properties
DOI:
10.14359/51701051
Date:
8/1/2017
Abstract:
Biobased materials are increasingly used for building insulation. Hemp concrete (hemp aggregates and mineral
binder) is an efficient thermal insulation material containing renewable resources. It provides also comfort in
habitation thanks to its acoustical and hygrothermal properties.
In this study, two hemp concrete “wall” formulations are manufactured with one type of hemp shiv and two
commercial binders: natural prompt cement (rapid hardening) and a formulated binder based on lime. Ninety
days of curing (65% RH – 20°C/68°F) ensures the hardening of the materials.
The influence of binders on the microstructure and its relation with functional properties is investigated in this
paper.
Similar behaviors in thermal conductivity, acoustical performances and hygroscopic properties are observed for
the two binders. No differences are measured through porosity, which can explain the similar functional
properties behaviors as they partly depend on porosity. Both formulations have low compressive strength
compared with hemp concretes in literature. This could be due to the shiv extractible compounds that impact the
hydration of the mineral binders.