Volume 23 Issue 2
Apr.  2023
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Article Navigation >  Journal of Traffic and Transportation Engineering  > 2023  >  23(2): 126-140
GAO Jie, YAO Yu-quan, WANG Di, HE Liang, LIU Zhuang-zhuang, YANG Jian-gang, ZHAO Long. Effect of time-temperature coupling on moisture stability of RHAM in post-production stage[J]. Journal of Traffic and Transportation Engineering, 2023, 23(2): 126-140. doi: 10.19818/j.cnki.1671-1637.2023.02.009
Citation: GAO Jie, YAO Yu-quan, WANG Di, HE Liang, LIU Zhuang-zhuang, YANG Jian-gang, ZHAO Long. Effect of time-temperature coupling on moisture stability of RHAM in post-production stage[J]. Journal of Traffic and Transportation Engineering, 2023, 23(2): 126-140. doi: 10.19818/j.cnki.1671-1637.2023.02.009
shu

Effect of time-temperature coupling on moisture stability of RHAM in post-production stage

doi: 10.19818/j.cnki.1671-1637.2023.02.009
  • 1.

    School of Civil Engineering and Architecture, East China Jiaotong University, Nanchang 330013, Jiangxi, China

  • 2.

    School of Highway, Chang'an University, Xi'an 710064, Shaanxi, China

  • 3.

    Department of Civil Engineering, Aalto University, Espoo 02150, South Finland, Finland

  • 4.

    School of Civil Engineering, Chongqing Jiaotong University, Chongqing 400074, China

  • 5.

    China Railway Siyuan Survey and Design Group Co., Ltd., Wuhan 430063, Hubei, China

Funds:

National Natural Science Foundation of China 52268068

National Natural Science Foundation of China 52278440

National Natural Science Foundation of China 52111530134

Natural Science Foundation of Jiangxi Province 20202BABL214046

Natural Science Foundation of Chongqing cstc2020jcyj-msxmX0431

More Information
  • Author Bio:

    GAO Jie(1989-), male, assistant professor, PhD, gaojie@ecjtu.edu.cn

    YANG Jian-gang(1979-), male, associate professor, PhD, 2851@ecjtu.edu.cn

  • Received Date: 2022-10-04
    Available Online: 2023-05-09
  • Publish Date: 2023-04-25
    Abstract
  • To reveal the evolution of blending degree of aged and virgin asphalt in the post-production stage of recycled hot-mix asphalt mixture (RHAM) and its effect on the moisture stability of RHAM, the temperature dissipation law and time consumption of RHAM in the post-production stage were investigated, and four typical post-production stage working conditions were constructed, with the time-temperature equivalent as the indicator. The effect of time-temperature equivalent on promoting the blending of aged and virgin asphalt was revealed by using Pb to identify the virgin asphalt, with the help of the energy dispersive spectrometer analysis. The scouring effect of rainwater on the recycled asphalt pavement under the action of tire running was simulated through the moisture-induced sensitivity test of asphalt mixture. The quantitative relationship between the time-temperature equivalent and the moisture stability of RHAM under the dynamic water scouring conditions was analyzed. The strength differences of seven types of RHAMs before and after the post-production stage in five plant-mixed hot recycled asphalt pavement projects were compared, and the effect of time-temperature equivalent on the compaction of recycled asphalt pavement was demonstrated. Research results show that the blending degree of aged and virgin asphalt is directly proportional to the time-temperature equivalent in the post-production stage. The void development of RHAM under the dynamic water scouring can be prevented by increasing the time-temperature equivalent, so as to improve its moisture stability. As the time-temperature equivalent increases by 10%, the Marshall stabilities of RHAM under unscoured, weak, medium, and strong scouring conditions increase by 0.86%, 2.94%, 2.13%, and 3.34%, respectively, and the splitting strengths before and after freeze-thawing increase by 1.24% and 0.21%, respectively. The stability of RHAM after the post-production stage improves significantly, with the increase amplitude ranging from 9.0% to 32.4%. Under the premises of ensuring the compaction temperature and standardized construction, there is no inevitable relationship between the time-temperature equivalent and the compaction quality. Since the time-temperature equivalent can improve the performance of RHAM, it is recommended to extend the post-production stage under the premise of ensuring the compaction temperature.

     

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