醋酸类除冰盐侵蚀沥青混合料机理研究

发布时间：2018-02-28 13:35

本文关键词： 沥青混合料除冰盐机理浸没间接拉伸试验粘度表面张力　出处：《武汉大学学报(工学版)》2015年02期 　论文类型：期刊论文

【摘要】：使用醋酸类除冰盐除冰雪后,沥青路面出现沥青软化、沥青膜剥落、混合料松散等新型病害而导致沥青路面耐久性下降.针对新型除冰盐侵蚀破坏沥青混合料问题,提出了以TSR/D作为技术指标的浸没间接拉伸试验方法(ITT),试验结果表明醋酸类除冰盐侵蚀破坏沥青混合料的程度与除冰盐溶液的浓度呈正相关性.研究同时从沥青软化及除冰盐溶液-沥青界面特性二个角度开展除冰盐溶液侵蚀机理试验分析.采用动力粘度试验研究沥青粘度变化规律,结果表明:沥青经过高浓度除冰盐溶液浸泡后,沥青粘度明显降低,浸泡溶液浓度越高、浸泡时间越长沥青软化现象越显著;采用核磁共振试验研究除冰盐溶液-沥青界面特性,结果表明,随着除冰盐浓度的增加,除冰盐溶液表面张力降低、除冰盐密度增加,除冰盐液滴渗入沥青膜内部的速度明显增加,进而加速沥青路面的损坏.
[Abstract]:After using acetic acid deicing salt to remove ice and snow, asphalt pavement appears new diseases, such as bitumen softening, asphalt film peeling off, mixture loose and so on, which results in the deterioration of asphalt pavement durability. An indirect tensile test method with TSR/D as technical index is proposed. The results show that the degree of acetic acid deicing salt damage asphalt mixture is positively correlated with the concentration of deicing salt solution. The corrosion mechanism of deicing salt solution was analyzed from two angles of deicing salt solution and deicing salt solution interface characteristics. The dynamic viscosity test was used to study the change of asphalt viscosity. The results show that the viscosity of asphalt decreases obviously after immersion in high concentration deicing salt solution. The higher the concentration of soaking solution, the longer the soaking time is, the more obvious the softening phenomenon of asphalt is. The interfacial characteristics of deicing salt solution and asphalt were studied by NMR test. The results showed that the surface tension of deicing salt solution decreased and the deicing salt density increased with the increase of deicing salt concentration. The speed of deicing salt droplets infiltrating into the asphalt membrane increases obviously, which accelerates the damage of asphalt pavement.
【作者单位】：河北工业大学土木工程学院;河北省土木工程技术研究中心;天津市市政工程研究院;
【基金】：国家自然科学基金项目(编号:50908072)
【分类号】：U414

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