Este trabalho tem por objetivo estudar a viabilidade de uso do resíduo fino de quartzito e do pó de pedra de dunito de minerações da região Sudoeste do estado de Minas Gerais – Brasil, como agregados misturados ao Solo de Comportamento Laterítico Argiloso (LG’) no tratamento de camadas de base e sub-base de pavimentos de baixo volume de tráfego. Foram preparadas misturas com o solo e os resíduos em proporções distintas e realizados ensaios laboratoriais propostos na metodologia MCT (Miniatura, Compactado, Tropical) para classificação e obtenção de algumas propriedades geotécnicas. Os resultados alcançados apontam para a potencial substituição do agregado convencional, visto que as amostras avaliadas enquadraram-se nas classes “satisfatórias” e/ou “recomendadas” da Classificação MCT, abrindo perspectivas de um aproveitamento mais amplo dos resíduos e sub-produtos da produção de placas de quartzitos e agregados de rochas ultrabásicas.

The main objective was to determine the deleterious potential of quartzite mining tailings subjected to different ASR alkali–silica reaction tests. The studies included petrographic analysis, chemical analysis of cements, expansion tests in mortar bars and concrete prisms, and microstructural analysis. Petrographic analysis of quartzites indicated high percentages of deformed quartz (95%), and were classified as potentially reactive. Two types of HES high early strength cement with alkaline equivalents of 0.749% and 0.61%, respectively, were selected. Of the 8 samples analyzed by the accelerated method in mortars, only 2 quartzite samples and 1 diabasium sample indicated potentially reactive behavior. The accelerated and long-term methods in concrete prisms proved to be effective and were consistent with the deleterious potential of the samples. All analyzed samples were diagnosed with the ASR gel. In the microstructural analysis, in addition to the ASR products, other expansive products of late ettringite were detected. Reaction mitigation methods are proposed so that quartzite waste can be used as an alternative aggregate in concrete, and thus contribute to the reduction of mine tailings and, consequently, reduce the negative environmental impact from mining.

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CORRÊA, F. A. Contribution to studies on Brazilian rocks for use as railway ballast aggregate: emphasis on geomechanical correlations and alterability tests. 2022. Dissertation (Master in Geotechnics)