Abstract
As a renewable biomass resource, biochar is new to modify or replace asphalt binder in pavement engineering. This paper focuses on the effect of biochar on the anti-aging performance of asphalt binder. The short-and long-term aging properties of biochar modified asphalt binder were investigated using dynamic shear rheometer (DSR) and bending beam rheometer (BBR) tests. The modification mechanism was investigated through the Fourier-transform infrared spectroscopy (FTIR) test. The aging tests and viscosity analysis showed that the softening point of biochar modified asphalt binder was higher than base asphalt binder, while the aging index and aging viscosity ratio were lower than base asphalt binder. After aging, the temperature sensitivity of biochar modified asphalt binder decreased and the high-temperature stability, reflected by dynamic shear modulus and resistance to rutting, improved. The BBR test after long-term aging showed that the anti-aging performance of biochar modified asphalt binder decreased with the decrease in temperature, and control of the biochar content could ensure good low-temperature performance of the modified asphalt binder after aging. FTIR spectra analysis showed that biochar in modified asphalt binder is physically blended with asphalt binder.
Recommended Citation
W. Dong et al., "Evaluation of Anti-Aging Performance of Biochar Modified Asphalt Binder," Coatings, vol. 10, no. 11, pp. 1 - 19, MDPI, Nov 2020.
The definitive version is available at https://doi.org/10.3390/coatings10111037
Department(s)
Civil, Architectural and Environmental Engineering
Keywords and Phrases
Aging performance; Biochar; Modified asphalt binder; Pavement material; Rheology
International Standard Serial Number (ISSN)
2079-6412
Document Type
Article - Journal
Document Version
Final Version
File Type
text
Language(s)
English
Rights
© 2020 The Authors, All rights reserved.
Creative Commons Licensing
This work is licensed under a Creative Commons Attribution 4.0 License.
Publication Date
01 Nov 2020
Comments
This research was funded by the Natural Science Found Committee (NSFC) of China (grant no. 51108038 and no. 51108039), and the Special Fund for Basic Scientific Research of Central Colleges, Chang’an University, (grant no. 300102318208).