Silica fume as porogent agent in geo-materials at low temperature |
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| Authors: | E Prud’homme P Michaud E Joussein C Peyratout A Smith S Arrii-Clacens JM Clacens S Rossignol |
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| Affiliation: | 1. Groupe d’Etude des Matériaux Hétérogènes (GEMH-ENSCI) Ecole Nationale Supérieure de Céramique Industrielle, 47-73 Avenue Albert Thomas, 87065 Limoges, France;2. GRESE, EA 3040, 123 Avenue Albert Thomas, 87060 Limoges, France;3. Laboratoire de Catalyse en Chimie Organique (LACCO), Université de Poitiers, UMR CNRS 6503, 40 Avenue du Recteur Pineau, 86022 Poitiers Cedex, France;1. Graduate Program on Materials Science and Engineering, Federal University of São Carlos, Via Washington Luiz, km 235, São Carlos, SP, Brazil;2. Dipartimento di Ingegneria Industriale, Università degli Studi di Padova, via Marzolo, 9, Padova, Italy;3. Department of Materials Science and Engineering, The Pennsylvania State University, University Park, PA 16802, USA;1. Department of Industrial Engineering, University of Padova, via Marzolo, 9, Padova, Italy;2. Department of Materials Science and Engineering, The Pennsylvania State University, University Park, PA 16802, United States;1. Department of Industrial Engineering, University of Padova, via Marzolo, 9, Padova, Italy;2. Department of Materials Science and Engineering, The Pennsylvania State University, University Park, PA 16802, United States |
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| Abstract: | The synthesis of geopolymers based on alkaline polysialate was achieved at low temperature (～25–80 °C) by the alkaline activation of raw minerals and silica fume. The materials were prepared from a solution containing dehydroxylated kaolinite and alkaline hydroxide pellets dissolved in potassium silicate. Then the mixture was transferred to a polyethylene mold sealed with a top and placed in an oven at 70 °C for 24 h. For all geopolymer materials, following dissolution of the raw materials, a polycondensation reaction was used to form the amorphous solid, which was studied by FTIR-ATR spectroscopy. The in situ inorganic foam based on silica fume was synthesized from the in situ gaseous production of dihydrogen due to oxidation of free silicon (content in the silica fume) by water in alkaline medium, which was confirmed via TGA-MS experiments. This foam has potential as an insulating material for applications in building materials since the thermal measurement has a value of 0.22 W m?1 K?1. |
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