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Article dans une revue

Porosity control of cold consolidated geomaterial foam: Temperature effect

Joseph Henon 1 Arnaud Alzina 1 Joseph Absi 1 David Stanley Smith 1 Sylvie Rossignol 2, * 
* Auteur correspondant
2 SPCTS-AXE3 - Axe 3 : organisation structurale multiéchelle des matériaux
SPCTS - Science des Procédés Céramiques et de Traitements de Surface
Abstract : Porous K-geopolymers with mutli-scale porosity were synthetized, based on the production of molecular hydrogen due to the oxidation of free silicon associated with polycondensation reactions. The various drying steps at low temperatures influencing the foams morphology were evaluated in function of parameters like mass effect, mold dimensions and drying cycles. The results obtained evidenced the possibility to perform reproducible foams with a control of their porosity. These foams are in agreement with the environmental demand with their recycling properties and their low cost of production due to the cheap materials used and the low temperature of synthesis. Some other advantages like their fire resistance, acid/base resistance, their good mechanical properties and their good thermal conductivity is a good point for future applications. As an example a homogeneous foam with a pore size of 1.5 mm at 50 °C (9 days for an achieved drying but consolidated before) can be prepared. Moreover the porosity can be controlled with various temperature cycles decreasing the time of synthesis. From the cycles tested (70-55 °C and 70-23 °C), some homogeneous samples were obtained with pores sizes varying from 0.5 to 1.5 mm. Then the work was extended to larger surfaces exchange, what evidences the importance of drying and mass effects upon the porosity as well as the mechanical properties of the mold used during synthesis. © 2011 Elsevier Ltd and Techna Group S.r.l. All rights reserved. All rights reserved.
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Article dans une revue
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Contributeur : Sylvie Rossignol Connectez-vous pour contacter le contributeur
Soumis le : jeudi 24 juillet 2014 - 16:07:24
Dernière modification le : samedi 26 mars 2022 - 04:28:25


  • HAL Id : hal-01045148, version 1



Joseph Henon, Arnaud Alzina, Joseph Absi, David Stanley Smith, Sylvie Rossignol. Porosity control of cold consolidated geomaterial foam: Temperature effect. Ceramics International, Elsevier, 2012, 38 (1), pp.77. ⟨hal-01045148⟩



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