Análise mecanicista de diferentes seções de pavimentos semirrígidos para vias de tráfego pesado

Abstract

At the beginning of the 20th century, on the European continent, studies of soil stabilization using cement began. These were intended to obtain a low-cost material and better structural performance than that obtained with commonly applied natural materials. From lean concrete, for the base of pavements, cemented crushed stone was developed. Cemented crushed stones results from the mixture of cement, water and gravel, used mainly in semirigid pavements. Its main use in Brazil is in pavements with asphalt coatings. The mechanical strength of this material is directly influenced by the proportion of each of the elements in the machined mixture, with emphasis on cement, by the application method and by the mineral origin of the components. The objective of this work is to make a mechanistic analysis of the performance of the cemented crushed stones in a typical semi-rigid pavement of the BR-101/SE, making use of the AEMC software and different performance prediction models, varying its position in the multilayer system Parameters such as stiffness, strength, particle size distribution, and dosage were altered in order to find the best applications of cemented crushed stones in pavement layers, resulting in the best pavement performance over time and finding the best possible sizing without changing layer thickness. Through the analysis, it was observed that the highest estimated service lives for the studied section were obtained for a wide application of cemented layers in the pavement, including sub-base and subgrade reinforcement layers, in contrast to the application in BR-101/SE, where cemented crushed stone was only applied in the pavement base, resulting in the shortest service life among those studied.