Estudo sobre a utilização do agregado seixo britado em misturas asfálticas do tipo CAUQ no Maranhão

Abstract

The following work has as main objective to study the physical and mechanical properties of the crushed pebbles for the applicability of this material in asphalt mixtures of type CAUQ, which can serve as a rolling layer on roads in the state of Maranhão. Initially, the study was based on a bibliographical survey on the different aspects about paving, types and classification of pavement, asphalt and aggregates. Laboratory tests were then carried out to characterize the crushed pebble and other materials using widely recognized standards and test methods, besides studying the volumetric and mechanical parameters of the asphalt mixtures that used the pebble as aggregate. The results show that aggregate of crushed pebble were satisfactory for use in paving, with the exception of adhesiveness and absorption. Test specimens with different binder contents were made in order to study the volumetric and mechanical parameters, after the analysis, new asphalt mixtures were made using ideal binder content, and then subjected to a diametral compression tensile strength test. All the results were compared to the requirements of the cited standards, and finally the asphalt mixtures with pebbles were compared to the asphalt mixtures analyzed in Nascimento's study (2015) which used basaltic and granitic aggregates. Thus, it was concluded that asphalt mixtures with crushed pebbles, although not complying with the requirements of the cited standards, can be used provided that using binder contents between 6.5% and 7%. Asphalt mixtures with crushed pebbles compared to mixtures with basaltic and granitic aggregates showed lower stability and lower diametral compression tensile strength