玄武岩纤维改善再生沥青混合料路用性能研究

Study on Pavement Performance of Basalt Fiber-improved the Recycled Asphalt Mixture

在国内外对玄武岩纤维改善再生沥青混合料路用性能鲜有研究的情况下,以新的视角来研究BF对再生沥青混合料路用性能的改善。首先通过马歇尔试验确定再生沥青混合料中最佳玄武岩纤维的掺量及新沥青掺量,然后通过车辙试验、低温弯曲试验、浸水马歇尔试验及冻融劈裂试验研究玄武岩纤维对再生沥青混合料高温稳定性、水稳定性、低温稳定性等路用性能的改善效果。试验表明:与未掺加纤维的再生沥青混合料相比,掺加0.3%玄武岩纤维的再生沥青混合料的动稳定度提高45%,抗弯拉强度提高7.5%,马歇尔残留稳定度提高6.4%,表明玄武岩纤维可以明显改善再生沥青混合料的路用性能。

Few research has been done on the improvement of basalt fiber to improve pavement performance of recycled asphalt mixture at home and abroad,First through Marshall test to determine the optimal content of basalt fiber and new asphalt of the recycled asphalt mixture,and then by rutting test,low-temperature bending test,immersion Marshall test and freeze-thaw splitting test to research the pavement performance effect of the basalt fiber improved the recycled asphalt mixture with high temperature stability,water stability,low temperature stability et al. The test results show that： compared with recycled asphalt mixture with not adding fiber,adding 0.3% basalt fiber of recycled asphalt mixture of dynamic stability increased 45% and the flexural strength increased by 7. 5%,the residual Marshall stability increased by 6.4%,show that basalt fiber can obviously improve the pavement performance of the recycled asphalt mixture.