季冻区硅藻土改性沥青的高低温性能及抗老化性能  

High and Low Temperature Performance and Aging Resistance Property of Diatomite Modified Asphalt in Seasonal Freezing Region

作　　者：张君韬 赵辉 杜守继[1] 姚鸿儒 曹亚东 徐孜广 ZHANG Juntao;ZHAO Hui;DU Shouji;YAO Hongru;CAO Yadong;XU Ziguang(School of Naval Architecture,Ocean&Civil Engineering,Shanghai Jiao Tong University,Shanghai 200140,China;CCCC Shanghai Third Harbor Engineering Science and Technology Research Institute Co.Ltd,Shanghai 200032,China;CCCC Third Harbor Engineering Co.,Ltd Shanghai branch,Shanghai 2000122,China;Shanghai Road and Bridge Group Co.Ltd,Shanghai 200433,China)

机构地区：[1]上海交通大学船舶海洋与建筑工程学院,上海200140 [2]中交上海三航科学研究院有限公司,上海200032 [3]中交第三航务工程局有限公司上海分公司 [4]上海公路桥梁(集团)有限公司,上海200433

出　　处：《材料科学与工程学报》2020年第5期716-721,共6页Journal of Materials Science and Engineering

摘　　要：探索硅藻土改性高标号沥青的效果及沥青性能变化情况,以利解决沥青路面在季冻区气候条件及车辆荷载作用下病害频发的问题。为此,综合运用流变、沥青结合料弯曲和老化试验对沥青改性前后的高低温及抗老化性能进行评价,并从微观角度对沥青性能变化机理进行了分析。研究结果表明:在所取的硅藻土含量范围内,总体上看,与较高含量(10%、15%、20%、25%)相比取小值(5%)可更好地改善高标号沥青的粘弹性、抗车辙和抗老化性能,且低温性能降幅更小;通过微观分析发现,硅藻土含量较大时沥青中硅藻会产生结团和堆叠,其吸附性能发挥受阻,对轻质组分吸收不充分,进而影响对沥青的改性效果。In solution of frequent asphalt pavement diseases under the climate of seasonal freezing region and traffic load,it is advantageous to explore the modification effect and property changes of high grade asphalt modified by diatomite.Therefore,high&low temperature performance and aging resistance property of asphalt before and after modification were estimated based on comprehensive application of rheology test,asphalt binder bending measurement and aging test.And the mechanism of asphalt property changes were also analyzed from microcosmic angle.The results of research indicate the following:Within the range of diatomite content(5%,10%,15%,20%,25%)used in these tests,5%diatomite can do the best in improving viscoelastic,anti-rutting and aging resistance properties of the high grade asphalt,and in decreasing amplitude of low temperature performance as well.Microcosmic observation reveals that diatoms in asphalt cluster and pile up in these diatomite contents higher than 5%,which will inhibit the adsorption function of diatom in asphalt.Lightweight component in asphalt cannot be adsorbed efficiently which leading to the degradation of modification effect.

关 键 词：季冻区 硅藻土 高标号沥青 性能变化 微观机理 

分 类 号：U414[交通运输工程—道路与铁道工程]