4 Zhongzi Highway Maintenance and Testing Technology Co.,Ltd.,Beijing 100097,China
5 College of Architecture and Civil Engineering,Beijing University of Technology,Beijing 100124,China
6 School of Civil and Transportation Engineering,Beijing University of Civil Engineering and Architecture,Beijing 100044,China
7 Beijing Urban Transportation Infrastructure Engineering Technology Research Center,Beijing 100044,China
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Received
Published
Revised
2025-02-02
2026-02-08
2025-10-22
Online Date
2026-09-21
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摘要
为研究激活作用下乳化沥青冷再生混合料强度的增强机理,首先研究激活作用下乳化沥青冷再生混合料路用性能的演变,继而通过扫描电子显微镜(scanning electron microscopy,SEM)、能量色散谱仪(energy dispersive spectroscopy,EDS)和原子力显微镜(atomic force microscopy,AFM)研究激活作用下界面过渡区(interfacial transition zone,ITZ) 的形貌变化,分析混合料强度与界面过渡区形貌间的关系。结果表明:在乳化沥青冷再生混合料中加入激活剂能够有效提高其高温性能、低温性能和水稳定性能,激活乳化沥青冷再生混合料的15 ℃劈裂强度较不掺加激活剂的乳化沥青冷再生混合料提高达30.8%;激活乳化沥青冷再生混合料的界面结构紧密,随着养生时间的增加,界面过渡区宽度逐渐减小。激活作用下养生7 d的界面过渡区宽度与未激活状态下相比减小了77.8%。激活作用下旧沥青中的轻质组分可以得到有效补充,同时,激活剂中的苯乙烯-丁二烯-苯乙烯嵌段共聚物(styrence-butadiene-styrence,SBS)可以扩散到旧沥青中进行改性,从而促进了新旧沥青的融合。
Abstract
To investigate the mechanism of strength enhancement of emulsified asphalt cold-recycled mixture under activation,firstly,the evolution of its pavement performance under the influence of activation was studied. Subsequently,the morphological changes in the interfacial transition zone(ITZ) under activation were analyzed using scanning electron microscopy(SEM),energy dispersive spectroscopy(EDS),and atomic force microscopy(AFM). The relationship between mixture strength and ITZ morphology was also explored. Results show that the addition of the activator significantly improves the high-temperature performance,low-temperature performance,and water stability of the emulsified asphalt cold-recycled mixtures. The splitting strength of the activated mixture at 15 ℃ increases by 16.3% to 30.8% compared to the non-activated mixture. The interfacial structure of the activated mixture is more compact,with the ITZ width decreasing over curing time. After 7 days of curing,the ITZ width is reduced by 77.8% under activation compared to the non-activated state. Under activation,the light components in the old asphalt binder are effectively replenished,and the styrence-butadiene-styrence(SBS)in the activator could diffuse into the old binder to modify it,thereby promoting the integration of new and old binder.
DONG Yuan-shuai, XUE Zhong-jun, TIAN Jia-lei, WEI Peng-cheng, WANG Jia-ni, LI Bao-feng.
Mechanism of Strength Enhancement of Emulsified Asphalt Cold Recycled Mixture under Effect of Activator[J].
Science Technology and Engineering, 2026, 26(4): 1654-1664 DOI:10.12404/j.issn.1671-1815.2500666
乳化沥青冷再生混合料的强度是由RAP料之间的内摩阻力和嵌挤力,以及乳化沥青胶浆的黏结力共同构成的。冷再生混合料中胶结性能的发挥依赖于连续沥青膜的形成,沥青膜的形成经历了一系列的理化反应变化,包括水分蒸发、絮凝破乳、矿物骨料与乳化沥青的浸润黏附等[7-8]。为提升乳化沥青冷再生混合料的路用性能,复合再生剂、废油类再生剂、石油类再生剂是较为常见的再生剂/还原剂,主要成分为芳香族油分[9-14]。Li等[15]研究发现,再生剂的使用,降低了再生混合料的最佳用水量和最佳乳化沥青用量。与未加入冷再生剂的再生混合料进行比较分析发现,加入冷再生剂后,低温性能、抗开裂性能、抗剥落性能、抗冻融破坏性能均有一定提升,但其对于混合料性能的增强机理未有明确解释。研究发现,沥青再生剂具有极易挥发、稳定性差等缺点,此类材料虽能够使旧沥青部分性能得到恢复,但对于再生混合料整体路用性能的提升效果并不明显。Lin等[16]向沥青混合料中添加了废植物油,结果表明,与未再生的沥青混合料水稳定性相比,二者在同等水平。沥青与RAP料的界面黏结性能会显著影响混合料的整体强度[17-19]。基于复合材料细观力学的界面相模型假设沥青与集料发生物理化学反应之后,生成了具有一定厚度的界面过渡区,由于该区域位于沥青与集料之间,性能与二者相异,故将界面过渡区当成中间层[20]。随着扫描电子显微镜(scanning electron microscope,SEM)[21]、原子力显微镜(atomic force microscope,AFM)、纳米压痕(nano-indentation,NI)[22]等微纳观表征技术的发展,使黏附机理的研究从宏观尺度推进到了微纳观尺度。Zhu等[23]利用能量色散谱仪(energy dispersive spectroscopy,EDS)等纳米尺度测量技术,证实了界面过渡区的存在。目前,对界面过渡区的研究多以热拌沥青混合料为主,乳化沥青冷再生混合料中界面黏结强度的形成机制依然不清。
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