文章摘要
垂直振动成型冷再生混合料的疲劳特性研究
Study on fatigue characteristics of cold regenerative mixture of vertical vibration molding
投稿时间:2018-12-12  修订日期:2019-01-22
DOI:
中文关键词: 冷再生混合料  疲劳特性  垂直振动法  RAP掺量
英文关键词: Cold recycled mixture  fatigue characteristics  vertical vibration method  RAP content
基金项目:浙江交通科技项目(2016-2-17)
作者单位E-mail
蒋应军 长安大学 特殊地区公路工程教育部重点实验室 895615537@qq.com 
林宏伟 长安大学 公路学院  
韩占闯 长安大学 公路学院  
陈浙江 金华市公路管理局  
胡永林 金华市金东区公路管理段  
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中文摘要:
      为深入研究乳化沥青冷再生混合料的疲劳特性,采用更符合混合料现场压实工况的垂直振动法成型圆柱体试件。研究了RAP掺量、成型方法及浸水环境对冷再生混合料疲劳特性的影响,并应用Weibull分布建立冷再生混合料疲劳方程,并借助扫描电镜揭示了冷再生的疲劳抗裂机理。结果表明:新集料掺量对冷再生混合料的疲劳性能有显著影响,疲劳性能随新集料掺量的增加呈抛物线变化趋势,当新集料掺量为20%时疲劳性能最优;垂直振动法设计冷再生混合料在应力作用下的抗疲劳性能及对应力变化敏感性优于马歇尔法;与未浸水试件相比,不同应力水平下浸水试件的疲劳寿命均缩短,对应力变化更加敏感;水泥-乳化沥青胶浆相互渗透胶结,并将集料紧密粘结,形成较致密的网状结构,有效改善胶浆与集料的界面协调变形,延缓裂缝发展。
英文摘要:
      In order to study the fatigue characteristics of the emulsified asphalt cold recycled mixture, the cylindrical test piece is formed by the vertical vibration method which is more in line with the compaction conditions of the mixed material. The effects of RAP content, forming method and water immersion environment on the fatigue characteristics of cold reclaimed mixture were studied. The fatigue equation of cold reclaimed mixture was established by Weibull distribution, and the fatigue cracking mechanism of cold regeneration was revealed by scanning electron microscopy. The results show that the new aggregate content has a significant effect on the fatigue performance of the cold recycled mixture. The fatigue performance shows a parabolic trend with the increase of the new aggregate content. When the new aggregate content is 20%, the fatigue performance is optimal. The vertical vibration method designed the cold-recycled mixture to have better fatigue resistance and stress sensitivity than the Marshall method under stress. Compared with the un-immersed test piece, the fatigue life of the immersed test piece under different stress levels decreased, more sensitive to stress changes; cement-emulsified asphalt cement interpenetrate and cement, and the aggregates are tightly bonded to form a denser network structure, which effectively improves the interface deformation coordination of the cement and aggregate, and delays the development of cracks.
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