Performance Evaluation of the Modified Asphalt Mixture with Glass and Basalt Fiber

Improve the performance properties of Hot Mix Asphalt (HMA) by using various additives has always been a concern for researchers. Fibers as one of the varieties of additives have a good ability to change the asphalt mix due to the appropriate mechanical properties. In order to evaluate the performance of glass and basalt fiber in asphalt so far, many studies have been conducted on these materials separately. In the past researches, the simultaneous effects of two or more additives in asphalt mixtures rarely have been considered. This research has been conducted with the aim of examining parameters and the functional properties of modified asphalt mixtures with glass and basalt fiber simultaneously. For this purpose, it was made modified asphalt specimens with 0.1, 0.2 and 0.3 percent of these fibers and tested under Marshall Test, Resilient Modulus, Rutting, Dynamic creep and humidity sensitivity. The result shows that the use of glass and basalt fiber at the same time leads to an increase of the Marshall Index and flow number in the asphalt mix that indicates more resistance to permanent deformation like rutting. Adding 0.1% of these fibers as an optimum amount increase the resilient modulus by about 15%. Furthermore, an increase of 9.5% in the TSR index in modified samples with 0.3% of glass and basalt fibers indicates the positive effects of these two types of fibers against moisture damages.