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Silica fume as porogent agent in geo-materials at low temperature

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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Soumis le : mercredi 12 octobre 2011 - 14:41:36
Dernière modification le : samedi 26 mars 2022 - 04:26:37



Elodie Prud'Homme, Philippe Michaud, Emmanuel Joussein, Claire Peyratout, Agnès Smith, et al.. Silica fume as porogent agent in geo-materials at low temperature. Journal of the European Ceramic Society, 2010, 30 (7), pp.1641-1648. ⟨10.1016/j.jeurceramsoc.2010.01.014⟩. ⟨hal-00631475⟩



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