Materiales de Construcción, Vol 58, No 291 (2008)

Geopolymerization of lightweight aggregate waste


https://doi.org/10.3989/mc.2008.v58.i291.105

P. Soares
Ceramics & Vaso Eng. El depto./CICECO, Universidad de Aveiro, Aveiro, Portugal

A. T. Pinto
Civil Depto. de Ingeniería, Universidad de Trás-os-Montes e de Contralto Douro, Vila Verdadero, Portugal

V. M. Ferreira
Civil Eng. El depto./CICECO, Universidad de Aveiro, Aveiro, Portugal

J. A. Labrincha
Ceramics & Vaso Eng. El depto./CICECO, Universidad de Aveiro, Aveiro, Portugal

Abstract


Geopolymerization is a viable way to process and re-use alumino-silicate industrial waste while producing highstrength, high chemical inertia materials that can effectively immobilize other industrial by-products, and even hazardous waste.

In this study industrial waste from different stages of the manufacture of lightweight expanded clay aggregate was characterized for its possible transformation, via alkali activation, to geopolymers. The ultimate aim was to assess the possibility of using such geopolymers to develop thermal and acoustic insulation panels. The containment of hazardous materials is another important application for these new materials.

Geopolymers were prepared for this study with different particles size distributions and activator concentrations. Their mechanical properties, composition and microstructure were characterized and a material with promising insulating properties was produced. A preliminary analysis was conducted of the salt formation observed in these geopolymers, the chief drawback to their use.

Keywords


geopolymers; alkali activation; lightweight aggregates; recycling

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References


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