摘要
为了扩大沥青改性剂的使用范围,并改善现有技术中存在的问题。采用NAB、NAP两种成核剂来制备不同掺量的改性沥青。通过三大指标试验、DSR试验、紫外老化试验、长期老化试验和BBR试验,研究成核剂改性沥青的基本性能、高温流变性能、紫外老化性能、长期压力老化性能和低温流变性能。研究结果表明:成核剂改性沥青软化点提高12.93%,针入度下降21.60%;成核剂改性沥青高温抗车辙性能较好;其紫外老化指数和长期老化指数远低于基质沥青的,具有较明显的抗老化性能;成核剂改性沥青的低温蠕变劲度模量减小,蠕变速率增大,低温流变性能得到明显改善。成核剂改性沥青明显提高了基质沥青的高温流变性能、抗老化性能和低温流变性能,推荐成核剂最佳掺量为1.0%~2.0%。
To broaden the range of asphalt modifiers and improve the existing problems in the present technology,the modified asphalts with different contents were prepared by the NAB and NAP nucleating agents.The basic property,high-temperature rheological property,ultraviolet aging property,long-term pressure aging property,and low-temperature rheological property of nucleating agent modified asphalt were studied by the three index tests,DSR test,ultraviolet aging test,longterm aging test,and BBR test.The results indicate that,the softening point of nucleating agentmodified asphalt increases by 12.73%,and the penetration decreases by 21.60%.The nucleating agent modified asphalt shows the good high-temperature rutting resistance.The UV aging indices and longterm aging index of the asphalt with nucleating agent are much lower than those of matrix asphalt,which has significant anti-aging performance.The low-temperature flexibility of nucleating agentmodified asphalt increases,and the low-temperature rheological property is significantly improved.The high-temperature rheology,aging resistance,and low-temperature rheology of matrix asphalt are significantly improved by nucleating agent.The recommended optimum content of nucleating agent is 1.0%~2.0%.
作者
金娇
陈晖文
赵文声
黄秀娴
JIN Jiao;CHEN Huiwen;ZHAO Wensheng;HUANG Xiuxian(School of Traffic&Transportation Engineering,Changsha University of Science&Technology,Changsha 410114,China;Chenghe Technology Co.,Ltd.,Guangzhou 510080,China)
出处
《交通科学与工程》
2024年第1期1-8,27,共9页
Journal of Transport Science and Engineering
基金
国家自然科学基金(52174237,51704040)
湖南省杰出青年科学基金(2022JJ10051)
湖南创新型省份建设专项(2020RC3039)
长沙市科技计划项目(kq2106042)。
关键词
成核剂
改性沥青
高温稳定性
长期老化
nucleating
modified asphalt
high temperature stability
long-term aging
