氯盐融雪剂浓度对沥青及沥青混合料性能影响研究

发布时间：2019-01-11 18:46

【摘要】：我国北方地区在冬季经常出现沥青路面积雪结冰的情况,为了保证交通顺畅和安全,常采用撒布氯盐类融雪剂的方式融冰除雪,缓解交通压力。但氯盐类融雪剂在融雪除冰的同时会对沥青路面造成破坏。特别是融雪剂撒布不均时,部分路面会因承受高浓度融雪剂侵蚀路用性能显著降低。本文通过室内试验研究了清水、7%、14%、21%、28%四种浓度氯化钠溶液对沥青及沥青混合料性能的影响,主要结论有:(1)氯盐溶液的融雪化冰能力随着氯盐溶液浓度的增大先提高后降低,在氯盐溶液浓度为23%时融雪化冰能力最强。(2)随着氯盐溶液浓度的上升,沥青的感温性能和高温性能越来越好,低温性能、沥青与集料的黏附性越来越差;浓度大于18%的氯盐溶液浸泡后的沥青10℃延度不能满足规范要求;浓度大于14%的氯盐溶液浸泡后的沥青与玄武岩集料的黏附性等级不能满足规范要求。(3)以不同浓度的氯盐类融雪剂浸泡后的沥青混合料为研究对象,进行了低温劈裂试验、单轴静载压缩蠕变试验和冻融劈裂试验,并应用黏弹性原理对沥青混合料蠕变试验做了分析。试验结果表明,随着氯盐融雪剂浓度上升,沥青混合料的高温性能、低温性能和水稳定性能越来越差。(4)综合考虑了氯盐融雪剂浓度对沥青及沥青混合料性能的影响,推荐除雪工程中融雪剂撒布到路面上的浓度不要超过14%。综上所述,氯盐类融雪剂浓度对沥青及沥青混合料的性能有着显著影响。在实际除雪工作中,应根据降雪量和道路结冰情况在推荐值基础上酌情增减,撒布时要注意均匀铺洒,这样可以有效地减轻融雪剂对道路的危害。
[Abstract]:In the northern part of China, snow icing often occurs on asphalt pavement in winter. In order to ensure smooth and safe traffic, it is often used to melt ice and snow with the method of dispersal chlorine salt snowmelt agent to relieve traffic pressure. But the chlorine salt snow melting agent will destroy the asphalt pavement at the same time of melting snow and deicing. Especially when the snow melting agent is distributed unevenly, the road performance of some pavement will be significantly reduced due to the erosion of high concentration snow melt agent. In this paper, the effects of clear water and 28% sodium chloride solution on the performance of asphalt and asphalt mixture were studied. The main conclusions are as follows: (1) the ice melting ability of chloride solution increases first and then decreases with the increase of chloride solution concentration, and the ice melting ability of chlorine salt solution increases with the concentration of 23 chloride salt solution, and (2) with the increase of chlorine salt solution concentration, The temperature sensing and high temperature properties of asphalt are getting better and better, and the low temperature performance and the adhesion between asphalt and aggregate are becoming worse and worse. The ductility of bitumen after immersion in chloride solution with concentration of more than 18% can not meet the requirements of specifications. The degree of adhesion between asphalt and basalt aggregate after immersion in chloride solution with concentration of more than 14% can not meet the requirements of the specification. (3) the bituminous mixture soaked with different concentrations of chlorine salt snowmelt agent is taken as the research object. The low temperature splitting test, uniaxial static compression creep test and freeze-thaw splitting test were carried out, and the creep test of asphalt mixture was analyzed by viscoelastic principle. The experimental results show that the high temperature, low temperature and water stability properties of asphalt mixture become worse and worse with the increase of chloride snow melting agent concentration. (4) the influence of chlorine salt snow melting agent concentration on asphalt and asphalt mixture performance is considered synthetically. It is recommended that the concentration of snow melting agent spread to the road should not exceed 14% in the snow removal project. To sum up, the concentration of chlorine salt snow melting agent has a significant effect on the performance of asphalt and asphalt mixture. In the actual snow removal work, it is necessary to increase or decrease according to the amount of snow falling and the ice formation on the road on the basis of the recommended value, and pay attention to spreading evenly when spreading, so as to effectively reduce the harm of the snowmelt agent to the road.
【学位授予单位】：吉林大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U414

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