Estudo comparativo do comportamento mecânico entre a mistura asfáltica de CAUQ convencional e reciclada

Abstract

In Brazil, highways represent the main structure available for the transport of cargo and passengers. With intense use, a large part of its coating presents a high degree of degradation requiring restorations. The removal of the degraded layer through milling, for later reconstitution of the coating, has generated a high volume of waste. The possibility of recycling the milled material can be presented as a viable technical and economic alternative, in addition to environmental aspects. In this work, we sought to analyze the use of the milled material in an asphalt mixture with the addition of 20% of this material in Hot Machined Asphalt Concrete (CAUQ) dosage by the Marshall method. For this purpose, specimens were molded using both milled material and a conventional mixture of CAUQ. Standardized parameters were analyzed, such as: percentage of voids, bitumen/void ratio, stability and creep. The results point to an equivalence of design asphalt content values regarding the percentage of voids and bitumen/voids ratio; however, in relation to Stability and Fluency, the recycled mixture indicates the need to adjust the dosage, indicating that an increase in the asphalt content would improve these two parameters. For the same bitumen content for the two mixtures, the study indicates the possibility of using the recycled mixture for pavement coating, provided that it composes an intermediate or connecting layer, which is less required than the rolling layer.