中文核心期刊
CSCD来源期刊
中国科技核心期刊
RCCSE中国核心学术期刊

重庆交通大学学报(自然科学版) ›› 2020, Vol. 39 ›› Issue (09): 88-96.DOI: 10.3969/j.issn.1674-0696.2020.09.13

• 道路与铁道工程 • 上一篇    下一篇

盐冻融循环条件下复合纤维改性沥青混合料耐久性能研究

张航1, 2,凌天清1,王学武2   

  1. (1. 重庆交通大学 土木工程学院,重庆 400074; 2. 四川省交通运输厅 工程质量监督局,四川 成都 610041)
  • 收稿日期:2019-04-24 修回日期:2019-07-26 出版日期:2020-09-18 发布日期:2020-09-22
  • 作者简介:张航(1990—),男,陕西铜川人,工程师,博士研究生,主要从事道路建材方面的研究。E-mail:448570706@qq.com
  • 基金资助:
    国家自然科学基金项目(51478046;51611130189)

Durability of Hybrid Fiber Modified Asphalt Mixture under Salt Freeze-Thaw Cycles

ZHANG Hang1, 2, LING Tianqing1, WANG Xuewu2   

  1. (1. School of Civil Engineering, Chongqing Jiaotong University, Chongqing 400074, China; 2. Engineering Quality Supervision Bureau of Sichuan Provincial Transport Department, Chengdu 610041, Sichuan, China)
  • Received:2019-04-24 Revised:2019-07-26 Online:2020-09-18 Published:2020-09-22

摘要: 通过模拟盐冻融循环条件,采用OT试验、四点弯曲疲劳试验,以荷载损失率、疲劳寿命次数分析不同复合纤维对沥青混合料耐久性能的影响,并研究荷载损失率与疲劳寿命、累计耗散能之间的相关性。结果表明:随着盐冻融循环次数增大,5种沥青混合料荷载损失率逐渐升高,疲劳寿命及累计耗散能则呈下降趋势;相较于SBS改性沥青混合料,经过盐冻融循环后复合纤维C改性沥青混合料的荷载损失率显著降低,疲劳寿命与累计耗散能大幅提高,而复合纤维B与SBS改性沥青混合料的耐久性能大体相当;4种改性沥青混合料在不同盐冻融循环次数下,其荷载损失率与疲劳寿命、累计耗散能之间呈线性相关,且相关性系数均大于0.9,OT试验与四点弯曲疲劳试验均能够有效评价盐冻融循环前后沥青混合料的耐久性能。

关键词: 道路工程, 沥青混合料, 复合纤维, 盐冻融, 耐久性

Abstract: Through simulating the salt freeze-thaw cycle conditions, OT test and four point bending fatigue test were used to analyze the influence of different composite fibers on the durability of asphalt mixture with load loss rate and fatigue life times. And the correlation among load loss rate, fatigue life and cumulative dissipation energy was studied. The results show that: with the increase of salt freeze-thaw cycles, the load loss rate of five kinds of asphalt mixtures improves gradually, while the fatigue life and cumulative dissipation energy shows a downward trend. Compared with SBS modified asphalt mixtures, the load loss rate of composite fiber C modified asphalt mixtures decreases significantly after salt freeze-thaw cycles, and the fatigue life and cumulative dissipation energy increases significantly, while the durability of composite fiber B and SBS modified asphalt mixture is almost the same. Under different salt freezing and thawing cycles, the load loss rate of four kinds of modified asphalt mixture is linearly correlated with fatigue life and cumulative dissipation energy, and the correlation coefficients are all greater than 0.9. Therefore, both OT test and four-point bending fatigue test can effectively evaluate the durability of asphalt mixture before and after salt freeze-thaw cycles.

Key words: highway engineering, asphalt mixture, composite fiber, salt freeze-thaw, durability

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