TY - JOUR
T1 - Effect of aging on chemical and rheological properties of bitumen
AU - Yang, Zhen
AU - Zhang, Xiaoning
AU - Zhang, Zeyu
AU - Zou, Bingjie
AU - Zhu, Zihan
AU - Lu, Guoyang
AU - Xu, Wei
AU - Yu, Jiangmiao
AU - Yu, Huayang
N1 - Funding Information:
Funding: This research was funded by National Natural Science Foundation of China [NSFC 51808228]. The APC was funded by “the Fundamental Research Funds for the Central Universities [2018MS92]”.
Publisher Copyright:
© 2018 by the authors.
Copyright:
Copyright 2019 Elsevier B.V., All rights reserved.
PY - 2018/12/5
Y1 - 2018/12/5
N2 - Engineering performance of asphalt pavement highly depends on the properties of bitumen, the bonding material to glue aggregates and fillers together. During the service period, bitumen is exposed to sunlight, oxygen and vehicle loading which in turn leads to aging and degradation. A comprehensive understanding of the aging mechanism of bitumen is of critical importance to enhance the durability of asphalt pavement. This study aims to determine the relations between micro-mechanics, chemical composition, and macro-mechanical behavior of aged bitumen. To this end, the effect of aging on micro-mechanics, chemical functional groups, and rheological properties of bitumen were evaluated by atomic force microscope, Fourier transform infrared spectroscopy and dynamic shear rheometer tests, respectively. Results indicated that aging obviously increased the micro-surface roughness of bitumen. A more discrete distribution of micromechanics on bitumen micro-surface was noticed and its elastic behavior became more significant. Aging also resulted in raised content of carbonyl, sulfoxide, and aromatic ring functional groups. In terms of rheological behavior, the storage modulus of bitumen apparently increased after aging due to the transformation of viscous fractions to elastic fractions, making it stiffer and less viscous. By correlation analysis, it is noted that the bitumen rheological behavior was closely related to its micro-mechanics.
AB - Engineering performance of asphalt pavement highly depends on the properties of bitumen, the bonding material to glue aggregates and fillers together. During the service period, bitumen is exposed to sunlight, oxygen and vehicle loading which in turn leads to aging and degradation. A comprehensive understanding of the aging mechanism of bitumen is of critical importance to enhance the durability of asphalt pavement. This study aims to determine the relations between micro-mechanics, chemical composition, and macro-mechanical behavior of aged bitumen. To this end, the effect of aging on micro-mechanics, chemical functional groups, and rheological properties of bitumen were evaluated by atomic force microscope, Fourier transform infrared spectroscopy and dynamic shear rheometer tests, respectively. Results indicated that aging obviously increased the micro-surface roughness of bitumen. A more discrete distribution of micromechanics on bitumen micro-surface was noticed and its elastic behavior became more significant. Aging also resulted in raised content of carbonyl, sulfoxide, and aromatic ring functional groups. In terms of rheological behavior, the storage modulus of bitumen apparently increased after aging due to the transformation of viscous fractions to elastic fractions, making it stiffer and less viscous. By correlation analysis, it is noted that the bitumen rheological behavior was closely related to its micro-mechanics.
KW - Aging
KW - Bitumen
KW - Functional group
KW - Micro mechanics
KW - Rheological property
UR - http://www.scopus.com/inward/record.url?scp=85058180278&partnerID=8YFLogxK
U2 - 10.3390/polym10121345
DO - 10.3390/polym10121345
M3 - Journal article
AN - SCOPUS:85058180278
SN - 2073-4360
VL - 10
JO - Polymers
JF - Polymers
IS - 12
M1 - 1345
ER -