期刊
CONSTRUCTION AND BUILDING MATERIALS
卷 224, 期 -, 页码 732-742出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.conbuildmat.2019.07.097
关键词
nano-ZnO; Modified asphalt; Physical properties; Anti-aging characteristics; Ultraviolet absorption
资金
- Key Research and Development Program of Shaanxi Province of China
- State Key Laboratory of High Performance Civil Engineering Materials [2018CEM010]
- Fundamental Research Funds for the Central Universities of China [300102318402, 300102219509, 300102319501]
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.
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