Study foliated quartzite waste to be the used in structures pavements. / Estudo do resíduo de quartzito foliado para emprego em estruturas de pavimentos.

AUTOR(ES)

Adson Viana Alecrim

DATA DE PUBLICAÇÃO

2009

RESUMO

The purpose of this study is to present an alternative use for quartzite mining wastes as base or subbase materials of flexible pavements. This proposition may not only reduces environmental impacts of quartzite extraction, but also valorises the quartzite aggregates, mainly for road applications. In Brazil quartzite extraction process produces about 90% of waste, and the use of this residue is still remarkably low. To establish the technical feasibility of employing this waste as pavement material a laboratory study was carried out. Mining residues were collected in four quartzite quarries located in the Southwest region of Minas Gerais, which is one of the most important Brazilian areas of quartzite mining, were characterized. Soil occurrences in the same region were also studied for mixing with quartzite waste. Mechanical properties of soil-quartzite waste aggregate mixtures were determined using California Bearing Ratio and Resilient Modulus tests. Two types of mixtures were evaluated: a gap-graded gradation mixture, in accordance with Nogami and Villibor proposition (1994 and 1995), and a well-graded mixture, according to the traditional granular stabilization criteria. The results show that there is no expressive influence of the quartzite gradation on the mechanical properties of soil-waste aggregate mixtures. The laboratory results indicate a high resistance and a low deformability of soilwaste aggregate mixture, comparable with standard unbounded granular materials and soil-conventional aggregate mixtures. The possibility of using wellgraded mixtures can provide an additional environmental benefit due to the entirely use of all waste fractions, with no need of crushing operation.

ASSUNTO(S)

análise mecanisista pavimento flexível resilient modulus resíduos de mineração módulo de resiliência mining wastes quartzitos aproveitamento de resíduos ensaio triaxial cíclico flexible pavements quartzites

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