Cumulative pore volume, pore size distribution and phases percolation in porous inorganic polymer composites: Relation microstructure and effective thermal conductivity

E. Kamseu; Zénabou N.M. Ngouloure; Benoît Nait-Ali; S. Zekeng; U.C. Melo; Sylvie Rossignol; C. Leonelli

Cumulative pore volume, pore size distribution and phases percolation in porous inorganic polymer composites: Relation microstructure and effective thermal conductivity

E. Kamseu ^{1, 2, *} Zénabou N.M. Ngouloure ² Benoît Nait-Ali ³ S. Zekeng ² U.C. Melo ² Sylvie Rossignol ⁴ C. Leonelli ¹

* Auteur correspondant

1 UNIMORE - Università degli Studi di Modena e Reggio Emilia

2 University of Yaounde

3 SPCTS-AXE1 - Axe 1 : procédés céramiques

SPCTS - Science des Procédés Céramiques et de Traitements de Surface

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

SPCTS - Science des Procédés Céramiques et de Traitements de Surface

Abstract : Rice hush (R) and volcanic (P) ashes, two recycled natural wastes were used for their high amorphous silica to improve the homogeneity and structure composition of inorganic polymer pastes before the expansion with aluminum powder. The fine powders were found to be appropriate in enhancing the geopolymerization and expansion conducting to lightweight structure with pore size and pore distribution linked to the viscosity, the concentration of blowing agent, and the crystalline nature of the waste. From the Stereo optical microscope, environmental scanning microscope and the mercury intrusion porosimetry used for the characterization, it appeared that in the interval of complete percolation of the skeleton, there exists correlation between the viscosity, expansion, roundness of pores, pores size distribution. The interpretation of the microstructure of porous geopolymer in this interval allows the description of their effective thermal conductivity with the Maxwell–Eucken model and the novel effective medium theory proposed recently.

Keywords : Pore shape Pore size Geopolymer Microstructure Effective thermal conductivity Viscosity

Type de document :

Article dans une revue

Domaine :

Chimie / Matériaux

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https://hal-unilim.archives-ouvertes.fr/hal-01116548
Contributeur : Fabrice Rossignol <>
Soumis le : vendredi 13 février 2015 - 15:54:27
Dernière modification le : vendredi 9 août 2019 - 11:38:06

Cumulative pore volume, pore size distribution and phases percolation in porous inorganic polymer composites: Relation microstructure and effective thermal conductivity

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Cumulative pore volume, pore size distribution and phases percolation in porous inorganic polymer composites: Relation microstructure and effective thermal conductivity

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