Experimental Study on High Temperature Performance of Nano-composite
Modified Asphalt and Its Mixture at Extreme High Temperature

doi:10.3969/j.issn.1674-0696.2018.03.06

Abstract

Abstract: 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.

Key words: road engineering, nano-composite modified asphalt, asphalt mixture, Hamburg wheel tracking test, rutting depth, extreme high temperature

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、TiO2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% TiO2+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% TiO2+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。

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

CLC Number:

U416

SU Manman1, 2, ZHANG Hongliang2, LV Jianwei3, ZHANG Yongping3. Experimental Study on High Temperature Performance of Nano-composite Modified Asphalt and Its Mixture at Extreme High Temperature[J]. Journal of Chongqing Jiaotong University(Natural Science), 2018, 37(03): 27-33.

苏曼曼1,2，张洪亮2，吕建伟3，张永平3. 极端高温下纳米复合改性沥青及其混合料高温性能试验研究[J]. 重庆交通大学学报（自然科学版）, 2018, 37(03): 27-33.

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Experimental Study on High Temperature Performance of Nano-composite Modified Asphalt and Its Mixture at Extreme High Temperature

极端高温下纳米复合改性沥青及其混合料高温性能试验研究

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