摘要
基于纳米材料的应用理念,采用纳米二氧化钛(TiO2)粉体对2种标号的石油沥青进行了改性研究,采用常规路用检测方法、短期热老化(TFO)、紫外光老化方法和流变测试手段,对纳米TiO2改性沥青进行了评价。研究结果表明,以纳米TiO2为改性剂,以70号、90号沥青为基础沥青,制得纳米TiO2改性沥青-70、纳米TiO2改性沥青-90。在纳米TiO2用量为3.5%(wt,质量分数)条件下,制得的纳米TiO2改性沥青-70、纳米TiO2改性沥青-90的针入度分别为60.0/0.1mm、79.0/0.1mm,软化点分别为48.1℃、45.7℃,60℃黏度分别为362Pa·s、208Pa·s,在紫外老化5h,疲劳时间分别达到620s、672s。从路用性能规定的常规指标来看,纳米TiO2改性效果远比普通矿粉填料效果突出,提高了沥青的耐疲劳性能和耐热老化性能,提高了沥青的抗紫外老化能力;与聚合物改性沥青相比,纳米TiO2对沥青高温性能提升幅度有限,对改性沥青的延展性有消极影响。
Based on the application concept of nano-materials,two kinds of petroleum asphalt were modified by nanotitanium dioxide(TiO2)powder.The modified asphalt was evaluated by conventional road testing method,short-term thermal aging(TFO),ultraviolet aging method and rheological testing method.Nano-TiO2modified asphalt-70and nano-TiO2modified asphalt-90were prepared by using nano-TiO2as modifier and 70and 90asphalt as base asphalt.When the content of nano- TiO2was 3.5%(mass fraction),the penetration of asphalt-70and asphalt-90 were 60.0/0.1mm and 79.0/0.1mm respectively,the softening point were 48.1℃ and 45.7℃ respectively,the viscosity at 60℃ were 362Pa·s and 208Pa·s respectively,and the fatigue time reached 620sand 672srespectively after 5hof ultraviolet aging.According to the conventional index of pavement performance,the effect of nano-TiO2modification was much more outstanding than that of ordinary mineral powder filler,and it can improve the fatigue resistance and heat aging resistance of asphalt,and improved the anti-ultraviolet aging ability of asphalt.But compared with polymer modified asphalt,nano-TiO2 had a limited improvement in high temperature performance of asphalt,and had a negative impact on the ductility of modified asphalt.
作者
樊亮
裴金荣
李永振
Fan Liang;Pei Jinrong;Li Yongzhen(Shandong Transportation Institute,Jinan 250031;Highway Maintenance TechnologyKey Laboratory for Transportation Industry,Jinan 250031;Shandong Yingcai University,Jinan 250000)
出处
《化工新型材料》
CAS
CSCD
北大核心
2019年第7期257-261,265,共6页
New Chemical Materials
基金
交通运输部应用基础研究项目(2013-319-781-140)
山东省交通科技计划项目(2012A006)
关键词
纳米二氧化钛
改性沥青
路用性能
热老化
紫外老化
nano-titanium dioxide
modified asphalt
road performance
thermal aging
ultraviolet aging
作者简介
樊亮(1981-),男,博士,研究员,从事道路工程材料研究工作。
