Estudo do comportamento de misturas solo-agregado como revestimento primário de estradas rurais.

Abstract

Seeking the development of technical alternatives that help in the conformation and maintenance of the unpaved roads, through a better utilization of the available technical and financial resources, this work was not carried out experimental studies whose objective was to evaluate the behavior of soil-aggregate mixtures for employment without the primary coating of rural roads in the Novo Xingu-RS region, uses a later soil and British soil 0 and gravel 1 as aggregates. The analyzes were based on the concepts of Soil Mechanics and Pavement Mechanics and Confrontation, with the literature that, at present, does not refer to the subject at all. The studies involve the characterization, compaction, California Support Index (ISC), MCT classification trials and tests to obtain soil resistance (direct shear, single and diametral compression) and soil-aggregate (simple and diametral compression), besides tests for the determination of the coefficient of friction of different surfaces. From the results obtained in the tests, the soil was first classified by the traditional classification systems and by the MCT qualification, and carried out analyzes and discussions that converge in the qualification of the soil studied for the use in the primary coating layer. Subsequently, the scaffolding with primary coating was carried out for a solution that met the criterion of tire / pavement friction. Finally, a survey of the costs of materials and services required for a primary coating with a solution was carried out, in order to evaluate the economic viability. It was concluded that the primary coating solution presented the best technical performance and was economically feasible for a 25 cm layer of compact soil in the intermediate energy with a needling of 1 cm of gravel 0 without loose stones on one as long as good drainage conditions are ensured, so that the clay layer does not saturate.