Development of ceramic insulators based on aluminum silicate geopolymers with additives and different additions of wood residues to adjust the porosity after burning and acoustical capability without burning.

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Abstract
04-085 Damião Carvalho Pereira Pereira, D.C.(Escola Politécnica da Universidade de São Paulo); Lenz e Silva, G.F.(Escola Politécnica da Universidade de São Paulo); Geopolymers are inorganic compounds with repeating units, such as: (-Si-O-Si-O-), (-Si-O-Al-), (Fe-O-Si-O-Al-O-), (-Al-O-P-O-) that generate new structures with amazing properties and new applications such as resistant ceramics, high temperature refractories to radioactive waste containers. The geopolymer synthesis is based on geopolymerization, a sequence of reactions processed in acid or alkaline medium through oligomers providing a three-dimensional molecular structure. In this work, thermal and acoustic insulator materials using polycondensation of metakaolin with alkaline activators (NaOH and sodium silicate) and admixtures of calcined alumina, micro silica, blast-furnace slag, wood sawdust and sisal natural fibers (Agave sisalana) has been developed. Maximum addition of wood sawdust was 30% by mass, to obtain large amount of porous into the material. Dextrin was used to reduce cracking from drying and curing process. Alkaline NaOH solution used had concentrations ranging from 0.0 to 14.0 M (mol / liter). The main performance tests were MOR (Modulus of rupture at room temperature), Elastic moduli by impulse excitation technique, porosity and thermal conductivity. All tests were performed using cylindrical samples with dimensions of 25mm x 80mm and 25mm x 30mm. Keyword: geopolymer, acoustic barrier materials, refractory material, activated metakaolin.
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