Research on the pavement performance of high-ash composite modified rock asphalt mixture

Quanlei Wang, Zhoucong Xu, Jie Wu, Fei Chen, You Zhou, Haifeng Zhang
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Abstract

With the ever-increasing highway transport volume and the transportation development towards the heavy-duty direction, pavement rutting, which has become one of the main highway pavement diseases, is increasingly serious and generates a strong impact the traffic safety. The main method currently used to handle pavement rutting is pavement overlay by means of pavement milling and repaving. When this method is used, however, the road needs to be closed to traffic, accompanied by complex construction technologies and a high engineering cost. How to enhance the rutting resistance of asphalt concrete and reduce the later-stage curing cost is a great difficulty faced by asphalt pavement engineering technicians at present. In this study, a high-ash composite modified rock asphalt mixture was prepared and evaluated, followed by the rutting test, immersion Marshall test, freeze-thaw splitting test, and low-temperature bending test. The results showed that the composite modification of common asphalt using natural Buton Rock Asphalt (BRA) could effectively improve the high-temperature performance, low-temperature performance, and resistance to water damage of pavements, especially showing evident advantages in rutting resistance.
高灰复合改性岩沥青混合料的路用性能研究
随着公路运输量的不断增加和交通运输向重载方向发展,路面车辙已成为公路路面的主要病害之一,日益严重,对交通安全产生强烈影响。目前处理路面车辙的主要方法是通过路面磨铣和重铺的方式进行路面覆盖。然而,在使用这种方法时,道路需要封闭,施工技术复杂,工程成本高。如何提高沥青混凝土的抗车辙性能,降低后期养护成本,是目前沥青路面工程技术人员面临的一大难题。本研究首先对高灰分复合改性岩沥青混合料进行了制备和评价,然后进行车辙试验、浸没马歇尔试验、冻融劈裂试验和低温弯曲试验。结果表明:用天然纽扣岩沥青(BRA)对普通沥青进行复合改性,可有效提高路面的高温、低温性能和抗水损伤性能,尤其在抗车辙方面优势明显。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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