摘要
为减缓极端高温天气下的沥青路面车辙病害,采用纳米ZnO、TiO_2和SBS对SK-70基质沥青进行复合改性,通过对比改性沥青针入度、软化点、延度、DSR及老化试验结果,提出对沥青高温性能改善最佳的纳米复合改性方案。进而根据AC-20和SMA-13沥青混合料级配制备了纳米复合改性沥青混合料,然后采用汉堡车辙试验仪对5种不同沥青混合料分别进行60、67、75℃下的车辙试验。试验结果表明:3%ZnO+0.5%TiO_2+3.7%SBS改性方案能较好改善基质沥青的高温性能,提高沥青的抗老化性能;对极端高温天气地区,推荐使用采用3%ZnO+0.5%TiO_2+3.7%SBS改性方案制备的AC-20沥青混合料作为中面层铺筑料,以抵抗极端高温天气造成的中面层剪切破坏。
In order to reduce the rutting failure of asphalt pavement at extreme high temperature,the nano-ZnO,nano-TiO2 and SBS were used to compositely modify SK-70 base asphalt.According to the comparison of penetration,softening point,ductility,DSR and the results of aging tests,a nano-composite modification scheme for improving the high temperature performance of asphalt was proposed.And then the nano-composite modified asphalt mixture was prepared according to the AC-20 and SMA-13 asphalt mixture grades.The rutting tests of 5 different asphalt mixtures were respectively carried out by a Hamburger rutting tester at 60℃,67℃and 75℃.The results show that 3% ZnO ＋0.5% TiO2 ＋3.7% SBS modified system has a good effect on high temperature properties of base asphalt,and can improve the aging-resistance ability of asphalt.For areas with extreme high temperature,the AC-20 asphalt mixtures with 3% ZnO ＋0.5% TiO2 ＋3.7% SBS modified asphalt was recommended as a medium layer paving material to resist the shear failure of middle layer caused by extreme high temperature weather.
作者
苏曼曼
张洪亮
吕建伟
张永平
SU Manman1, 2, ZHANG Hongliang2 , LV Jianwei3 , ZHANG Yongping3(1.School of Traffic and Transportation, Shijiazhuang Tiedao University, Shijiazhuang 050043, Hebei, P. R. China; 2.Key Laboratory for Special Area Highway Engineering of Ministry of Education, Chang＇an University, Xi＇an 710064, Shaanxi, P. R. China; 3. Hangzhou Highway Administration, Hangzhou 310000, Zhejiang, P. R. Chin)
出处
《重庆交通大学学报（自然科学版）》
CAS
北大核心
2018年第3期27-33,共7页
Journal of Chongqing Jiaotong University(Natural Science)
基金
浙江省交通运输厅资助项目(2014H25)
关键词
道路工程
纳米复合改性沥青
沥青混合料
汉堡车辙试验
车辙深度
极端高温
road engineering
nano-composite modified asphalt
asphalt mixture
Hamburg wheel tracking test
rutting depth
extreme high temperature
