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Article Dans Une Revue Journal of the European Ceramic Society Année : 2010

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

Résumé

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.

Domaines

Matériaux

Dates et versions

hal-00631475 , version 1 (12-10-2011)

Identifiants

Citer

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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