再生SBS改性沥青的蠕变与松弛性能研究
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李雪连(1978—),女,长沙理工大学副教授,博士

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U416.26

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湖南省教育厅重点项目(18A130)


Creep and relaxation performance of reclaimed asphalt using SBS modified
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    摘要:

    为分析不同掺量再生剂与 SBS改性沥青对再生沥青的高温蠕变和低温松弛等性能的影响,进行了沥青的针入度、软化点、延度、多重应力蠕变恢复(MSCR)与沥青弯曲蠕变试验(BBR)。试验结果表明:随着再生剂和 SBS改性沥青掺量的增加,再生沥青的针入度和延度会逐渐升高,而软化点则会逐渐降低。当再生剂掺量为4%,SBS改性沥青掺量为70%时,再生沥青的针入度、软化点、延度均与SBS改性沥青接近。掺入再生剂和 SBS改性沥青后,再生沥青的不可恢复蠕变柔量增大,而蠕变恢复率和松弛速率均降低。掺入再生剂和 SBS 改性沥青既能改善再生沥青的低温松弛性能,也能损害高温蠕变性能。

    Abstract:

    To analyze the effect of rejuvenator and SBS modified asphalt on the high-temperature creep and low-temperature relaxation performance of recycled asphalt,the penetration,ductility,softening point,multiple stress creep recovery(MSCR)and bending beam rheometer(BBR)test were carried out in this study. The results showed that the penetration and ductility of the recycled asphalt are increased with addition of the rejuvenator and SBS modified asphalt,however the softening point is decreased. When the rejuvenator and SBS modified asphalt content are 4% and 70% respectively,the penetration,ductility,and softening point of recycled asphalt will close to the SBS modified asphalt. When the rejuvenator and SBS modified asphalt is mixed,the non-recoverable creep compliance of recycled asphalt is increased,both the creep recovery rate and relaxation rate are decreased. It can be seen that the low-temperature relaxation performance of recycled asphalt will be improved by adding rejuvenator and SBS modified asphalt,while the high-temperature creep performance is degraded.

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李雪连,郭甲林,崔之靖,等.再生SBS改性沥青的蠕变与松弛性能研究[J].交通科学与工程,2022,38(2):7-12,53.
LI Xuelian, GUO Jialin, CUI Zhijing, et al. Creep and relaxation performance of reclaimed asphalt using SBS modified[J]. Journal of Transport Science and Engineering,2022,38(2):7-12,53.

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  • 在线发布日期: 2022-12-19
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