The use of non-conventional materials in asphalt pavements base

Abstract

In Brazil's Middle West Region, there is a scarcity of granular natural material to be used in subbase and base layers of urban asphalt pavements. As most urban roads to be paved have a low volume of traffic, it becomes necessary to define alternatives for the pavements' construction that have technical and economic feasibility. In this paper, laboratory studies were conducted with traditional and non-traditional materials available in the region, such as superficial fine soil found in abundance, crushed rock, quarry waste, hydrated lime and gravel. With the mixtures that showed better results in the laboratory, an experimental asphalt pavement was constructed to evaluate the performance of the structure made with different materials. During construction and after two years, the pavement was monitored by field tests. The results showed that the studied mixtures present technical feasibility and can be used in substitution for materials traditionally used.