董罗超　曹新建　王祎宾　刘峰

摘 要：为研究高黏度复合改性沥青，采用氧化石墨烯（Graphene Oxide，GO）和橡胶粉为复合改性剂对70#基质沥青进行改性。通过针入度试验、延度试验、软化点试验、动力黏度试验及布氏旋转黏度试验分析GO和橡胶粉的不同掺量对基质沥青性能的影响规律，从而确定GO和橡胶粉的最佳复合掺量。研究结果表明：随着GO和橡胶粉的增加，GO/橡胶粉复合改性沥青针入度减小，但当GO掺量为0.08%时，复合改性沥青的针入度减小速率变慢，当GO掺量为0.05%时，针入度达到最小值;复合改性沥青的延度和软化点随GO的增加而升高，尤其是GO掺量为0.05%时复合改性沥青的软化点均大于80 ℃;随着GO和橡胶粉的增加，复合改性沥青的60 ℃动力黏度和175 ℃旋转黏度值均提高，且0.05%GO+18%橡膠粉的175 ℃旋转黏度值大于3.0 Pa·s。所以，掺量为0.05%GO+18%橡胶粉的复合改性沥青可显著提升基质沥青的黏度、稠度、热储存稳定性及抗永久变形能力，从而提升道路使用寿命。

关键词：路面材料;高黏沥青;氧化石墨烯;复合改性

中图分类号：U414 文献标识码：A 文章编号：1003-5168（2021）34-0-03

Performance Evaluation of Nano Material Composite Modified Asphalt

DONG Luochao CAO Xinjian WANG Yibin LIU Feng

（1.School of Civil Engineering and Communication， North China University of Water Resources and Electric Power， Zhengzhou Henan 450045;2.Anhui Provincial Group Limited for Yangtze-to-huaihe Water Diversion， Hefei Anhui 230001;

3.Yellow River Engineering Consulting Co.， Ltd.， Zhengzhou Henan 450045）

Abstract： In order to study high viscosity composite modified asphalt， Graphene Oxide （GO） and rubber powder were used as composite modifiers to modify 70# matrix asphalt. Through penetration test， ductility test， softening point test， dynamic viscosity test and Brinell rotary viscosity test， the influence law of different content of GO and rubber powder on the performance of matrix asphalt is analyzed， so as to determine the best compound content of GO and rubber powder. The results show that with the increase of GO and rubber powder， the penetration of GO / rubber powder composite modified asphalt decreases， but when the content of GO is 0.08%， the reduction rate of penetration of composite modified asphalt slows down， and the penetration reaches the minimum when the content of GO is 0.05%; The ductility and softening point of composite modified asphalt increase with the increase of GO， especially when the content of GO is 0.05%， the softening point of composite modified asphalt is greater than 80 ℃; With the increase of GO and rubber powder， the 60 ℃ dynamic viscosity and 175 ℃ rotational viscosity of composite modified asphalt increase， and the 175 ℃ rotational viscosity of 0.05% GO + 18% rubber powder is greater than 3.0 Pa · s. Therefore， the composite modified asphalt with the best content of 0.05% GO + 18% rubber powder can significantly improve the viscosity， consistency， thermal storage stability and permanent deformation resistance of the base asphalt， so as to improve the service life of the road.

Keywords： pavement materials;high viscosity asphalt;graphene oxide;composite modification

随着经济的高速发展和交通荷载的快速增加，传统改性沥青路面逐渐出现各种问题，如高温性能不足导致路面出现龟裂、车辙、变形，低温性能不足导致路面开裂等，造成路面使用寿命低、维护成本高的现象，是我国交通领域新时期面临的重要难题之一。因此，研发环保、高品质、长寿命的沥青改性材料对我国交通领域创新发展具有重要意义。近年来，由于汽车保有量大幅度递增，每年产生的报废轮胎越来越多，而废旧轮胎属于工业有害固体废弃物，在常温下不能降解，势必会形成黑色污染，危及地球的生态环境，所以废旧橡胶轮胎的资源化高效利用得到了广泛关注。……