Author(s): M. Asli, F. Brachelet, E. Antczak, D. Defer
Paper category: Proceedings
Book title: Proceedings of the 2nd International Conference
on Bio-Based Building Materials
Editor(s): Sofiane AMZIANE, Mohammed SONEBI and Karine CHARLET
e-ISBN: 978-2-35158-192-6
Publisher: RILEM Publications SARL
Publication year: 2017
Pages: 405-411
Total Pages: 7
Language : English

Abstract: Most building materials, and more particularly bio-based materials, are subjected to
hygrothermal transfers in the environment in which they are disposed. These transfers depend
on the thermophysical characteristics and the ambient humidity and temperature conditions. In
this environment and despite these variations, the material must be able to ensure in a
sustainable manner, the functions for which it was implemented (thermal, mechanical, acoustic
...). In this paper we treated the coupled heat and mass transfer within bio-based building
material problematic. We have chosen the hemp concrete and we proceed as follow: a
thermophysical characterizations are done, in order to obtain the thermal, hygroscopic and
physical properties of hemp concrete. These values are then used as input parameters for a
numerical modelling. Philip and De Vries mathematical model which predicts heat and mass
transfer within porous media is implemented. The model takes into account thermal and hygric
transfer phenomenon. For the purpose of the model validation, experimental facility is carried
out, which consist of monitoring a sample made of hemp concrete. The temperature and relative
humidity are recorded with temperature and humidity sensors placed at the interface and inside
the material. The sample is positioned into the wall of laboratory, in order to separate the inside
and the outside conditions. The sample is submitted to real indoor and outdoor ambient
conditions. We aim to investigate the hygrothermal behaviour of hemp concrete and observe its
response versus ambient variation on the one hand, and to assess the mathematical model’s
ability to predict the hygrothermal behaviour on the other hand. The experimental and the
modelled results are compared and then discussed.

Online publication :2017
Publication type :full_text
Public price (Euros) : 0.00

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