Utilização de resíduos de caulim em tijolos de solo-cal.

Abstract

There is an evident growth in waste generation over the last decades, especially in developing countries. The mining industry produces large quantities and different kinds and levels of dangerousness, such as the kaolin processing industry, which produces waste based on silica, mica and kaolinite. Disposal of this residue causes a significant environmental impact, which could be minimized with the use of raw materials for use in civil construction. This research has as main objective to study the incorporation of the kaolin processing waste into soil-lime bricks. Conventional materials (soil, lime) and alternative (waste) were characterized by the following tests: particle size analysis by laser diffraction, chemical analysis, X-ray diffraction, differential thermal analysis and thermogravimetric analysis. The residues of kaolin were calcined at a temperature of 800 ° C for evaluation of pozzolanic activity. Foram moldados corpos-de-prova convencionais (solo-cal) e alternatives incorporados com 10%, 20%, 30% e 40% de residuo de caulim em substituicao do aglomerante cal. Test specimens used in conventional (soil-lime) and alternative embedded with 10%, 20%, 30% and 40% of residual kaolin in place of the lime binder were molded. Posteriormente, os corpos-deprova foram curados por periodos de 28, 60 e 90 dias. Later, the specimens were cured for periods of 28, 60 and 90 days. Verificaram-se as propriedades fisicomecanicas de resistencia a compressao simples e absorgao de agua. Physical and mechanical properties of compressive strength and water absorption were verified. After analyzing the results, we concluded that residues of kaolin have pozzolanic activity and properties suitable for use in soil-lime.