Bulk composition and microstructure dependence of effective thermal conductivity of porous inorganic polymer cements

Ellie Kamseu; Benoît Nait-Ali; Mc Bignozzi; C. Leonelli; Sylvie Rossignol; David Stanley Smith

Bulk composition and microstructure dependence of effective thermal conductivity of porous inorganic polymer cements

Ellie Kamseu ^* Benoît Nait-Ali ¹ Mc Bignozzi C. Leonelli Sylvie Rossignol ² David Stanley Smith ¹

* Auteur correspondant

1 GEMH - Groupe d'Etudes des Matériaux Hétérogènes

2 SPCTS-AXE3 - Axe 3 : organisation structurale multiéchelle des matériaux

SPCTS - Science des Procédés Céramiques et de Traitements de Surface

Abstract : Experimental results and theoretical models are used to assess the effective thermal conductivity of porous inorganic polymer cements, often indicated as geopolymers, with porosity between 30 and 70. vol.%. It is shown that the bulk chemical composition affects the microstructure (grains size, pores size, spatial arrangement of pores, homogeneity, micro cracks, bleeding channels) with consequently the heat flow behaviour through the porous matrix. In particular, introduction of controlled fine pores in a homogeneous matrix of inorganic polymer cements results in an increase of pore volume and improvement of the thermal insulation. The variation of the effective thermal conductivity with the total porosity was found to be consistent with analytical models described by Maxwell-Eucken and Landauer.

Keywords : Composites Inorganic polymer cements Microstructure-final Porosity Thermal conductivity

Type de document :

Article dans une revue

Domaine :

Chimie / Matériaux

Liste complète des métadonnées

https://hal-unilim.archives-ouvertes.fr/hal-01048568
Contributeur : Sylvie Rossignol <>
Soumis le : vendredi 25 juillet 2014 - 08:17:25
Dernière modification le : mercredi 14 février 2018 - 16:21:45

Bulk composition and microstructure dependence of effective thermal conductivity of porous inorganic polymer cements

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Bulk composition and microstructure dependence of effective thermal conductivity of porous inorganic polymer cements

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