Study on the change rule of low-temperature properties of asphalt binder with aging time

ABSTRACT

Low-temperature cracking is common distress in asphalt pavements. Understanding the change rule of its low-temperature properties is helpful in investigating the optimal maintenance timing of asphalt pavement. In this paper, the change rule of low-temperature properties of asphalt binders with aging time is investigated by various indexes. Four asphalt binders and four anti-aging modified asphalt binders were subjected to the rolling thin film oven (RTFO) test and pressure aging vessel (PAV) test. Dynamic Shear Rheometer (DSR) with the 4 mm parallel plates was used to determine the low-temperature properties of asphalt binders. The results show that aging and low temperature have a negative impact on the low-temperature properties of asphalt binders. The anti-aging agent improves the low-temperature properties and aging resistance of asphalt binders. Compared with other indexes, the critical cracking temperature T_c and the critical temperature difference ΔT_c are more suitable for analysing the effect of aging on the low-temperature properties of asphalt binders. Also, the ΔT_c shows the three-stage decreasing rule of ‘fast-slow-fast’, with the inflection points. It meant that the low-temperature properties of asphalt binders had been altered at the inflection points, which provided a favourable reference to research on the optimal maintenance timing of asphalt pavement.

KEYWORDS:

• Asphalt binder
• aging
• low-temperature index
• 4-mm DSR
• cracking

Disclosure statement

No potential conflict of interest was reported by the author(s).

Author contributions

The authors confirm their contribution to the paper as follows: study conception and design: Meng Guo, Yiqiu Tan; analysis and interpretation of results: Mingyang Guan, Xiuli Du; draft manuscript preparation: Meng Guo, Mingyang Guan. All authors reviewed the results and approved the final version of the manuscript.

Additional information

Funding

This study was supported by National Key R&D Program of China (2022YFE0137300) and National Natural Science Foundation of China (52078018).