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STUDY OF THE TRANSIENT HYGROTHERMAL BEHAVIOUR OF A MULTI-LAYERED HEMP CONCRETE WALL

DOI: 10.1615/ICHMT.2009.CONV.700
page 17

Anh Dung Tran Le
Laboratoire GRESPI - Thermomécanique, Faculté des Sciences PB1039, 51687 Reims, France

Chadi Maalouf
Laboratoire GRESPI - Thermomécanique, Faculté des Sciences PB1039, 51687 Reims, France

Ton Hoang Mai
Laboratoire GRESPI - Thermomécanique, Faculté des Sciences PB1039, 51687 Reims, France

Abstract

Hemp concrete is more and more recommended by the eco-builders because hemp is a renewable plant, recyclable and does not degrade within time. It corresponds perfectly to the requirements of High Environmental Quality buildings. To integrate this material into buildings, it is important to study its hygrothermal behaviour. In this paper, we study the transient hygrothermal behaviour of a multi-layered hemp concrete wall and we compare it with other materials used in buildings. The simulation environment SPARK was used. Moisture transport is made through liquid and vapour phases. The liquid phase is supposed to move by capillarity whereas the vapour phase diffuses under vapour partial pressure gradient. Our results suggest that hemp concrete reduces winter thermal heat losses and protects from summer heat waves. Besides its high vapour diffusivity allows buildings to breath. A numerical simulation is provided to depict the buffering capacity of hemp concrete structure as a function of the air exchange rate and the effective hemp concrete area.

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