Journal
MATERIALS
Volume 12, Issue 6, Pages -Publisher
MDPI
DOI: 10.3390/ma12060988
Keywords
fourier-transform infrared spectroscopy; aging resistance; diatomite-modified asphalt; functional groups
Categories
Funding
- Natural Science Foundation of Jiangsu Province [BK20170156]
- National Natural Science Foundation of China [51508150]
- Natural Science Foundation of Hebei Province [E2018402206]
- provincial support plans for the top of the notch youth talents of Hebei province [BJ2017034]
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In this paper, Fourier-transform infrared (FTIR) spectroscopy was used to evaluate the effects of diatomite on aging properties of an asphalt binder. The modified asphalts included 5%, 10%, and 15% diatomite, and were prepared in the laboratory. The changes in functional groups of asphalt were employed to investigate the aging mechanisms of the modified and control asphalts. Effects of diatomite on the anti-aging properties of asphalt were analyzed via the changes in intensity of the absorption peaks. Results showed that there were no new functional groups generated after diatomite mixing with asphalt. This indicated that the process of diatomite modification was just physical mixing. Furthermore, parts of saturates and aromatics were volatilized in the aging process of modified asphalt. Polar molecules reacted with oxygen in aging. Meanwhile, carbonyl (C=O) and sulfoxide (S=O) were also generated. The aging resistance of modified asphalt was the best when the diatomite content was 10%. The work of this paper may provide a new perspective to evaluate asphalt aging.
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