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The European Physical Journal Special Topics

, Volume 224, Issue 9, pp 1725–1735 | Cite as

Use of silicon carbide sludge to form porous alkali-activated materials for insulating application

  • E. Prud’homme
  • E. Joussein
  • S. RossignolEmail author
Regular Article
Part of the following topical collections:
  1. Advances in Design and Modeling of Porous Materials

Abstract

One of the objectives in the field of alkali-activated materials is the development of materials having greater thermal performances than conventional construction materials such as aerated concrete. The aim of this paper is to present the possibility to obtain controlled porosity and controlled thermal properties with geopolymer materials including a waste like silicon carbide sludge. The porosity is created by the reaction of free silicon contains in silicon carbide sludge leading to the formation of hydrogen. Two possible ways are investigated to control the porosity: modification of mixture formulation and additives introduction. The first way is the most promising and allowed the formation of materials presenting the same density but various porosities, which shows that the material is adaptable to the application. The insulation properties are logically linked to the porosity and density of materials. A lower value of thermal conductivity of 0.075 W.m−1.K−1 can be reached for a material with a low density of 0.27 g.cm−3. These characteristics are really good for a mineral-based material which always displays non-negligible resistance to manipulation.

Keywords

Sludge Pore Size Distribution Geopolymer European Physical Journal Special Topic Silica Fume 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© EDP Sciences and Springer 2015

Authors and Affiliations

  1. 1.Laboratory of Civil and Environmental Engineering, INSA LyonVilleurbanneFrance
  2. 2.Limoges University, GRESE EA 4330Limoges CedexFrance
  3. 3.European Ceramic Centre, Science of Ceramic Processing and Surface Treatments, Superior National School of Industrial CeramicsLimoges CedexFrance

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