1School of Civil Engineering, Chongqing Jiaotong University, Chongqing 400074, China 2Chongqing Technology and Business Institute, School of Urban Construction Engineering, Chongqing 400052, China 3School of Economics and Management, Chongqing Jiaotong University, Chongqing 400074, China
Received: September 1, 2021 Accepted: December 3, 2021 Publication Date: December 23, 2021
Copyright The Author(s). This is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are cited.
The effects of inorganic micro powder particle size and type on the water stability, low-temperature crack resistance, and fatigue performance of asphalt and its mixtures were evaluated through various tests, including asphalt foundation, freeze–thaw splitting, low-temperature bending beam, and indirect tensile fatigue tests. The evaluation results show that the addition of inorganic micro powder particles, specifically, hydrated lime and cement, resulted in significant improvement of the asphalt mixture splitting strengths and freeze–thaw splitting strength ratio. Moreover, a decrease in the additive particle size increased its specific surface area, further enhancing the asphalt mixture splitting strength and freeze–thaw splitting strength ratio. Under the same stress level, the smaller the additive particle size, the better the fatigue performance of the asphalt mixture. Althoug micro powder particles have an adverse effect on the low-temperature performance of asphalt mixtures, this effect gradually decreases with the micro powder particle size. Furthermore, compared with cement, hydrated lime exhibited better fatigue performance but poor water stability.
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