Hygrothermal properties of light earth insulation materials: evaluation of uncertainties and consequences

Author(s): T. Vinceslas, T. Colinart, H. Lenormand, A. Hellouin de Menibus, E. Hamard, T. Lecompte
Paper category: Proceedings
Book title: 3rd International Conference on Bio-Based Building Materials ICBBM 2019
Editor(s): Mohammed Sonebi and Sofiane Amziane
e-ISBN: 978-2-35158-229-9
Publisher: RILEM Publications SARL
Publication year: 2019
Pages: 198-203
Total Pages: 06
Language: English

Abstract: Hygrothermal simulation of bio-based materials requires heat or moisture storage and transfer
properties. Even if their determination is defined in numerous standards, characterization implies
uncertainties. In this work, we aim to evaluate the uncertainties in the determination of heat and
moisture storage properties of light earth insulation materials and of their constitutive raw materials
(hemp shiv and earth). Heat thermal capacity is evaluated by Differential Scanning Calorimetry
(DSC). Sorption isotherm is evaluated by gravimetric methods. Attention is paid on protocols and
methods, on the measurement repeatability or on the influence of drying temperature and relative
humidity. Results show that uncertainties up to 10 % are noted for heat capacity, while they may
rise up to 100 % for sorption isotherm. These values are compared to uncertainties due to material
variability. In addition, a discussion is proposed regarding the validity of mixing law. Last, the
consequences of all uncertainties are evaluated on the prediction of hygrothermal behavior of an
existing wall insulated with light earth insulation materials.

Online publication: 2019
Publication type : full_text
Public price (Euros): 0.00

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