Physical properties and anti-aging characteristics of asphalt modified with nano-zinc oxide powder

被引：87
|
作者：
Xu, Xu [1 ,2 ]
Guo, Haoyan [1 ,2 ]
Wang, Xiaofeng [3 ]
Zhang, Mingxiang [1 ,2 ]
Wang, Zhenjun [1 ,2 ]
Yang, Bo [3 ]
机构：
[1] Changan Univ, Sch Mat Sci & Engn, Xian 710061, Shaanxi, Peoples R China
[2] Changan Univ, Minist Educ PR China, Engn Res Ctr Pavement Mat, Xian 710061, Shaanxi, Peoples R China
[3] Res & Dev Ctr Highway Construct & Maintenance Tec, Zhengzhou 450052, Henan, Peoples R China
来源：
CONSTRUCTION AND BUILDING MATERIALS | 2019年 / 224卷
关键词：
nano-ZnO; Modified asphalt; Physical properties; Anti-aging characteristics; Ultraviolet absorption; ULTRAVIOLET AGING PROPERTIES; MOISTURE DAMAGE; RHEOLOGICAL PROPERTIES; FATIGUE CRACKING; BITUMEN; NANOMATERIALS; PERFORMANCE; MIXTURE; ZNO; BEHAVIORS;
D O I：
10.1016/j.conbuildmat.2019.07.097
中图分类号：
TU [建筑科学];
学科分类号：
0813 ;
摘要：
Asphalt aging holds responsibility for fatigue damage of asphalt pavement. Incorporation of nano-zinc oxide (nano-ZnO) as modifier into asphalt can effectively improve anti-aging property of asphalt. In this work, different dosage of nano-ZnO was added to original asphalt to prepare modified asphalt, and physical properties of nano-ZnO modified asphalt, including storage stability, penetration (25 degrees C), softening point and ductility (5 degrees C) were tested. Effect of nano-ZnO on the rheological properties of asphalt was studied by testing rheological properties of modified asphalt before and after aging. In addition, fatigue properties of asphalt with different nano-ZnO dosage were analyzed by linear amplitude sweep (LAS) test. Furthermore, anti-aging characteristics of nano-ZnO modified asphalt were characterized by thin film oven test (TFOT) and ultraviolet aging (UV-aging) test and mechanism was interpreted by UV-visible-infrared absorption test. The results show that nano-ZnO can influence penetration (25 degrees C), softening point, ductility (5 degrees C) and storage stability of asphalt. Nano-ZnO can improve complex shear modulus (G*), phase angle (8) and fatigue performance. Addition of nano-ZnO can evidently improve anti-UV aging ability of asphalt and make asphalt show certain viscosity recovery during aging process. In addition, nano-ZnO has strong absorption characteristics to ultraviolet light with more than 95% absorption rate, which reflects its superiority as anti-UV aging modifier for asphalt. UV absorption of nano-ZnO modified asphalt is enhanced several times than that of original asphalt. Asphalt modified with reasonable nano-ZnO dosage possesses significant and evident anti-aging characteristics. (C) 2019 Elsevier Ltd. All rights reserved.
引用
收藏
页码：732 / 742
页数：11
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