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多孔介质期刊
影响因子: 1.49 5年影响因子: 1.159 SJR: 0.43 SNIP: 0.671 CiteScore™: 1.58

ISSN 打印: 1091-028X
ISSN 在线: 1934-0508

多孔介质期刊

DOI: 10.1615/JPorMedia.v13.i2.30
pages 111-124

POROUS STRUCTURE AND HYDRIC PROPERTIES OF COB

Florence Collet
Laboratoire de Génie Civil et Génie Mécanique, Equipe Matériaux Thermo-Rhéologie, Universite Européenne de Bretagne, 35704 Rennes
Marjorie Bart
Laboratoire de Génie Civil et Génie Mécanique, Equipe Matériaux Thermo-Rhéologie, Universite Européenne de Bretagne, 35704 Rennes
Laurent Serres
Laboratoire de Génie Civil et Génie Mécanique, Equipe Matériaux Thermo-Rhéologie, Universite Européenne de Bretagne, 35704 Rennes
Jacques Miriel
Laboratoire de Génie Mécanique et de Génie Civil (LGMGC) de l'IUT Saint Malo et de l'INSA de Rennes 1

ABSTRACT

The aim of this work is to determine porous structure and hydric properties of cob, a local traditional material of the Rennes basin in Brittany (France) that is now used in low-energy buildings for its hygrothermal properties: this material shows low thermal conductivity (0.4 W m−1 K−1), high thermal capacity (815 J kg−1 K−1), and is said to bean efficient hydric regulator. This material, made of clay and reinforced with animal or vegetal fibers, is traditionally pressed in situ. Nowadays, manually compacted blocks of cob are prefabricated and are stabilized with a low quantity of cement (3% to 5% of clay mass). In this work, porous structure and hydric properties are investigated experimentally. The pore size distribution is measured by mercury porosimetry. Water vapor sorption isotherm (adsorption and desorption) and water vapor permeability are investigated by measuring weight differences according to time at 23° C. Then, porous structure and hydric properties are coupled in a theoretical study. The pore size distribution is computed from water vapor sorption. The specific surface area is then computed from mercury porosimetry and from water vapor sorption isotherm. From water vapor sorption and permeability measures, the water vapor diffusivity is evaluated.


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