Estabilização granulométrica de um solo com uso de brita para aplicação em pavimentos rodoviários

Abstract

Road transport in Brazil has a significant social and economic impact, with infrastructure projects, such as highway paving, boosting the national performance in recent years. Consequently, several studies have advanced the study of materials used in pavement layers. Particle size stabilization is a powerful ally in improving support capacity and, consequently, an effective solution for avoiding severe deformations. It also allows for the correction of mix size to meet the requirements imposed by regulatory agencies, particularly in base layers. Therefore, the use of granite aggregate in different proportions with soil has yielded interesting results when subjected to the California Bearing Ratio (CBR) test. It is also a material present in several regions of the country, given its widespread use in the construction industry. Therefore, this research sought to evaluate the increase in resistance of a granulometrically stabilized with granite gravel, with the following mass incorporations: 10%, 15% and 20%. Therefore, physical and mechanical characterization tests were performed on the natural soil and mixtures with different soil-gravel ratios, in addition to the individual physical characterization of the aggregate. The granulometrically stabilized mixtures presented satisfactory results, so that the values obtained revealed that all of them are suitable for use in sub-base layers. However, none of them achieved the 60% ISC established for use in pavement base layers. Therefore, more laborious tests, such as resilience modulus (MR) and permanent deformation (DP), compared to the ISC test, can reveal the true resistance of the mixtures when compared to simulations more suited to traffic stresses and climatic conditions. This makes it possible to carry out a more real analysis of its mechanical behavior, enabling its use as a pavement base.