Influence of filler on asphalt dispersions with recycled tire rubber for hot asphalt mix

Abstract

Mineral filler additions change the rheological behavior of the asphalt binder, which has a big impact on the properties of asphalt mixtures like rutting resistance, fatigue resistance, and thermal susceptibility. There is currently no specification in Argentina that specifies the ideal filler content to be added to hot asphalts modified with recycled tire rubber (RTR). In the current study, an analysis of the behavior of asphalt dispersions with varying amounts of RTR—from 15% to 25% of the binder weight—is done when mineral filler is incorporated in various concentrations. By measuring how the dispersion reacts to the softening point test and temperature sweep using a dynamic shear rehometer (DSR), it aims to establish a standard for the ideal amount of filler to incorporate and show how the RTR residue and filler work together to produce the desired results. The amount of rutting resistance offered by the asphalt has been found to increase by up to 200 percent when measured with DSR for the highest contents of RTR and filler.