Evaluation of UV aging behaviors of polyphosphoric acid (PPA) modified asphalt and its asphalt mixture

被引：4
|
作者：
Liu, S. [1 ]
Xu, Y. [2 ]
Zhou, S. [3 ]
机构：
[1] Hohai Univ, Coll Civil & Transportat Engn, 1 Xikang Rd, Nanjing 210098, Jiangsu, Peoples R China
[2] Zhejiang Sci Res Inst Transport, 188 Gangyang Rd, Hangzhou 310006, Zhejiang, Peoples R China
[3] Guangxi Key Lab Rd Struct & Mat, 6 Gaoxin Rd, Nanning 530007, Guangxi, Peoples R China
来源：
SCIENTIA IRANICA | 2020年 / 27卷 / 06期
基金：
中国国家自然科学基金; 中国博士后科学基金;
关键词：
Asphalt; Asphalt mixture; Polyphosphoric acid; Ultraviolet aging; FTIR; Thermal properties; MODIFIED BITUMEN;
D O I：
10.24200/SCI.2018.50195.1566
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Effects of polyphosphoric acid (PPA) on the ultraviolet (UV) aging properties of asphalt and asphalt mixture were studied. The morphologies of these binders were characterized by FTIR spectra and TG analysis, then the influence of PPA on asphalt and its mixture before and after UV aging were investigated by the physical properties and pavement performances. Results show that the mechanisms of PPA modified asphalt are physical and chemical reactions; both UV aging and PPA additive could prompted the polycondensation of light components in asphalt. Compared with control samples, the introduction of PPA enhances the asphalt properties and intensifies the asphalt mixture performances. Furthermore, the asphalt performance aging variations (penetration aging index, softening point increment, ductility aging index, G*/sin delta aging index) decrease significantly due to the introduction of PPA. This manifests that the effects of UV aging on the behaviors of asphalt and asphalt mixture are restricted by the addition of PPA through inhibiting the increase of carbonyl in the oxidation process. (c) 2020 Sharif University of Technology. All rights reserved.
引用
收藏
页码：2247 / 2257
页数：11
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