Utilização de material fresado para aplicação em camadas estabilizadas de bases e sub-bases de pavimentos rodoviários.

Abstract

A worldwide concern to provide an environmentally friendly destination of waste generated from maintenance activities and road reparation has driven the adoption of techniques for the reuse of industrial waste at the construction worksite. This research aims to present a technically and economically viable alternative to the use of milling waste in layers of sub-base and / or base pavements, through the mixing of soil deposit, lime and cement. This study was divided into two stages: the evaluation of physical properties of the materiais used and the evaluation of mechanical properties of mixed soil + MF, soil + MF + lime and soil + MF + cement. Based on a pilot experiment performed with mixtures of soil and milled material in the leveis of 20%, 25%, 30%, 35%, 40% and 45%, we adopted the fixed percentage of 45% milled material for the addition of binding by presenting a CBR value equal to 25%, which met the specifications for use in DNIT layers of sub-base (DNIT-ES 139/10). Then, were added in the pilot experiment, line to cement with contents to 2%, 4%, 6%, 8% and 10% (with fixed percentage of 45% of MF). The addition of lime and cement mixtures caused significant increases in CBR values when compared with the results obtained for the pure soil and soil mixture (55%) and milled material (45%). The best results were obtained in mixtures made with the addition of cement, which were observed CBR values ranging from 92% to 201% compatible with the specifications of DNIT for use in base layers and sub-base for road pavements (DNIT- ES 140 and 142/10). As for expansion, ali values were within the limits set by DNIT for use in sub-bases and road bases. The values of compression found for mixtures of soil (55%) + MF (45%), soil +MF + lime and soil + MF + cement, were higher than recommended by the Department of Roads of Texas for use sub-bases (0.35 MPa) and bases (0.7 MPa), showing the viability of the mixtures for in use in paving.