摘要
针对湿热地区高温多雨、高紫外辐射的特点,提升沥青在湿热地区的服役时间。基于响应曲面法,选取软化点、针入度、延度、黏度四项评价指标为响应值设计优化了复合改性沥青的制备参数,通过温度扫描、BBR、布氏黏度试验研究掺量对沥青抗老化性能影响。纳米有机蒙脱土的热分解分为三个阶段,且初始分解温度大于200℃,沥青的软化点和黏度随着纳米有机蒙脱土加入而增大,针入度和延度减小,纳米有机蒙脱土对沥青延度有不利影响;纳米有机蒙脱土和SBS的复合改性沥青相较于SBS改性沥青,抗老化性能得到了显著的改善,能够更好的在湿热地区下更好的服役;3.5%的纳米有机蒙脱土和4%的SBS为复合改性沥青的最佳掺量。
In view of the characteristics of high temperature and rainfall and high ultraviolet radiation in hot and humid areas,the service time of asphalt in hot and humid areas is improved.Based on the response surface method,four evaluation indexes of softening point,penetration,ductility and viscosity were selected as the response values to design and optimize the preparation parameters of composite modified asphalt,and the effect of dosage on the anti-aging performance of asphalt was studied by temperature scanning,BBR and Brinell viscosity test.The thermal decomposition of nano-organic montmorillonite is divided into three stages,and the initial decomposition temperature is greater than 200℃,the softening point and viscosity of asphalt increase with the addition of nano-organic montmorillonite,and the penetration and ductility decrease,and the nano-organic montmorillonite has an adverse effect on the ductility of asphalt.Compared with SBS modified asphalt,the composite modified asphalt of nano-organic montmorillonite and SBS has significantly improved the anti-aging performance,and can be better served in hot and humid areas.3.5%nano-organic montmorillonite and 4%SBS were the optimal dosages of composite modified asphalt.
作者
王小龙
秦仁杰
李清培
柳力
WANG Xiaolong;QIN Renjie;LI Qingpei;LIU Li(School of Traffic and Transportation Engineering,Changsha University of Science&Technology,Changsha 410114,China;Xizang Autonomous Region Transportation Zone,Lasa 850000,China)
出处
《应用化工》
北大核心
2025年第12期3103-3109,3114,共8页
Applied Chemical Industry
基金
国家自然科学基金(52208423)
长沙市杰出创新青年培养计划项目(kq2306009)。
关键词
道路工程
纳米有机蒙脱土
响应曲面法
复合改性沥青
沥青老化
road works
nano-organic montmorillonite
response surface method
composite modified asphalt
asphalt aging
