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Портал Begell Электронная Бибилиотека e-Книги Журналы Справочники и Сборники статей Коллекции
Journal of Porous Media
Импакт фактор: 1.49 5-летний Импакт фактор: 1.159 SJR: 0.43 SNIP: 0.671 CiteScore™: 1.58

ISSN Печать: 1091-028X
ISSN Онлайн: 1934-0508

Выпуски:
Том 22, 2019 Том 21, 2018 Том 20, 2017 Том 19, 2016 Том 18, 2015 Том 17, 2014 Том 16, 2013 Том 15, 2012 Том 14, 2011 Том 13, 2010 Том 12, 2009 Том 11, 2008 Том 10, 2007 Том 9, 2006 Том 8, 2005 Том 7, 2004 Том 6, 2003 Том 5, 2002 Том 4, 2001 Том 3, 2000 Том 2, 1999 Том 1, 1998

Journal of Porous Media

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

Краткое описание

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.

Ключевые слова: porosity, hydric, sorption, permeability, diffusivity

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