复掺芳纶纤维和玻璃纤维再生沥青混合料路用性能研究

为提高再生沥青混合料(RAP)的路用性能,通过研究芳纶纤维和玻璃纤维二者单掺以及复掺对再生沥青混合料路用性能的影响,以期为两种纤维在再生沥青混合料上的应用提供参考。研究结果表明:单掺芳纶纤维对再生沥青混合料的高温性能影响不大,而玻璃纤维和复掺纤维使再生沥青混合料的高温抗车辙性能分别提升了34.0%及42.6%;复掺纤维对再生沥青混合料动态模量的改善效果最高达21.9%;同时复掺纤维的加入可使混合料保持较好的低温抗裂性与水稳定性。半圆弯曲(SCB)测试结果表明,复掺纤维可显著改善沥青混合料的抗弯拉能力。复掺纤维较单掺纤维对再生沥青混合料有更好的改性效果,且改性效果显著。

Influences of Aramid Fiber and Glass Fiber on Road Performance of Recycled Asphalt Mixture

To improve the road performance of the recycled asphalt mixture (RAP), aramid fibers and glass fibers were selected in the research, and the influences of the single mixing and compound mixing on the road performance of the recycled asphalt mixture was studied. The research results show that the single mixing aramid fiber has little effect on the high-temperature performance of the recycled asphalt mixture. The high-temperature rutting resistance of recycled asphalt mixture is increased by 34.0% and 42.6% by glass fibers and composite fibers, respectively. The improvement of dynamic modulus of recycled asphalt mixture by adding composite fibers is up to 21.9%. The addition of composite fibers makes the mixture maintain good low-temperature crack resistance and water stability. The semi-circular bending (SCB) test results show that the composite fibers can significantly improve the bending ability of asphalt mixing materials.Compared with single fiber, the composite fiber has better modification effect on recycled asphalt mixture, and the modification effect is significant.