掺加纤维与青川岩沥青的热再生混合料配合比设

关键字：道路工程；纤维；青川岩沥青；路用性能；耐久

（商丘师范学院 建筑工程学院，河南 商丘  476000）

    摘要：为了改善大比例RAP掺量热再生混合料的水稳定性、低温抗裂性及极端气候条件下的耐候性和长期使用性能。基于车辙试验、低温弯曲试验、浸水马歇尔和冻融劈裂试验研究了木质素、聚酯、玄武岩纤维及3种纤维组成的复合纤维与青川岩沥青改性热再生混合料的路用性能。结果表明：掺加青川岩沥青和纤维能改善热再生混合料的抗车辙性能；提高大比例RAP掺量热再生混合料的水损害及抗裂性能；以青川岩沥青与复合纤维对热再生混合料的路用性能改善效果最佳，可应用于各种气候分区内的沥青路面表面层；采用纤维与青川岩沥青复配方案是改善大比例RAP掺量热再生混合料耐久性和极端气候条件下耐候性的有效技术途径。

    关键词：道路工程；纤维；青川岩沥青；路用性能；耐久性

    中图分类号：TU358        文献标识码：A        文章编号：1001-702X（2018）07-0121-05

 

Study on mixing ratio design and road performance of fiber-reinforced qingchuan rock asphalt

modified hot recycled mixture

ZHENG Huihui

（School of Building Engineering，Shangqiu Normal University，Shangqiu 476000，China）

   Abstract：In order to improve the water stability，low temperature crack resistance，weathering resistance and long-term serviceability under the extreme climatic conditions，a large proportion of RAP heat-reclaimed mixture was prepared. According to the research results of common fibers and existing Qingchuan rock bitumen in engineering，rutting test，low temperature bending test，water immersion Marshall and freeze-thaw splitting test were carried out to study the effects of lignin, polyester，basalt fiber and three kinds of fiber and Qingchuan Road Performance of Rock Asphalt Modified Hot Recycled Mixture. The results show that the Qingchuan rock asphalts and fibers can improve the anti-rutting performance of the hot-reclaimed mixture and improve the water damage and crack resistance of the hot-recycled mixture with a large proportion of RAP content. The effect of the Qingchuan-rock ashalt and the composite fiber modifier on the heat-road performance with the best performance improvement，can be applied to a variety of climate zones within the asphalt pavement surface layer，using fiber and Qingchuan rock asphalt compounding program is an effective technical approach to improve the durability of hot-recycled mixture with a large proportion of RAP content and its weather-resistance property under extreme weather conditions.

    Key words：road engineering，fiber，Qingchuan rock asphalt，road performance，durability