包覆氯盐融冰剂对沥青混凝土融冰和路用性能的影响研究

发布时间：2018-03-07 21:36

本文选题：沥青路面　切入点：融冰剂　出处：《武汉理工大学》2015年硕士论文　论文类型：学位论文

【摘要】：沥青路面在冬季易积雪结冰,极易引发交通事故的发生。掺加氯盐类融冰剂的蓄盐沥青混凝土作为一种主动融雪化冰方法,得到了越来越多的关注。然而,氯盐融冰剂的掺入会影响沥青混凝土的路用性能,同时随着氯盐融冰剂的溶解析出也会降低沥青路面的融雪化冰性能。如何降低氯盐融冰剂对沥青混凝土性能的影响,并延长其融雪除冰效果,对于蓄盐沥青混凝土的发展与应用具有重要意义。本文采用有机包覆的方法制备了包覆氯盐融冰剂,对包覆氯盐融冰剂的结构进行了表征,研究了不同类型有机物包覆氯盐融冰剂对沥青混凝土的路用性能、融冰性能及其长效性。主要结论如下:(1)将不同类型包覆剂对氯化钠或氯化钙进行包覆处理,制备出了包覆氯盐融冰剂。扫描电镜测试表明,包覆剂可以较好地包覆在氯盐颗粒的表面,包覆剂用量越多,包覆程度越好。包覆剂C1、C2制备的融冰剂包覆层较厚,而包覆剂C3则在氯化钠颗粒表面呈现较薄的包覆层;溶液冰点测试表明,采用氯化钠作为融冰盐制备的融冰剂氯离子释放更为缓慢,包覆剂C1制备的融冰剂溶液冰点较高,缓释性能更好,而随着包覆剂掺量的增大,溶液冰点逐渐升高,缓释性能也逐渐增强。(2)包覆氯盐融冰剂对蓄盐沥青混凝土的高温、低温性能影响不大,而掺加纯氯盐的沥青混凝土高温性能和低温性能则明显降低,表明氯盐对沥青混凝土高温、低温性能的影响可以通过包覆来改善。有机物的包覆作用可以极大地降低氯盐对沥青混凝土水稳定性能的负面影响,其中采用有机物C1氯盐制备的蓄盐沥青混凝土的水稳定性能最优。(3)与纯氯盐相比,包覆氯盐融冰剂降低了蓄盐沥青混凝土的短期融冰性能。采用低熔点的C3作为包覆剂,蓄盐沥青混凝土的短期融冰性能较好,且随着包覆剂掺量的增大,短期融冰性能逐渐降低。融冰剂掺量的增大会提升蓄盐沥青混凝土的短期融冰能力,选用钙作为融冰盐短期融冰能力更强。(4)包覆氯盐融冰剂的组成与结构对蓄盐沥青混凝土的长期融冰性能影响较大。采用包覆剂C1制备的蓄盐沥青混凝土浸泡12h后盐析出速率大,冰点粘附力低,长效性较好;随着包覆剂掺量的增大,蓄盐沥青混凝土的长期融冰性能逐渐增强,但包覆剂掺量增大至A3后,继续增大包覆剂用量对长期融冰性能影响不大;采用氯化钠作为融冰盐,融冰剂掺量为5%时,长期融冰性能最佳。(5)室外融雪实验表明,包覆氯盐融冰剂制备的蓄盐沥青混凝土,在浸泡12h后仍具有一定程度的融雪能力,而掺加纯氯盐的沥青混凝土在浸泡12h后则几乎不具备融雪效果,这表明对氯盐进行包覆提高了蓄盐沥青混凝土的长效性。
[Abstract]:Bituminous pavement is prone to snow and ice in winter, which can easily lead to traffic accidents. As a method of active snow melting and ice melting, bituminous concrete with chlorine salt and ice melting agent has been paid more and more attention. The mixing of chlorine salt ice melting agent will affect the pavement performance of asphalt concrete, and with the dissolution and precipitation of chlorine salt melting ice agent, it will also reduce the snowmelt ice performance of asphalt pavement. How to reduce the influence of chlorine salt melting ice agent on asphalt concrete performance, It is of great significance for the development and application of salt storage asphalt concrete to prolong the effect of snow melting and deicing. In this paper, the coating chlorine salt melting agent is prepared by organic coating method, and the structure of the coating chlorine salt melting agent is characterized. The road performance, ice melting performance and long-term effect of different organic compounds coated with chlorine salt ice melting agent on asphalt concrete were studied. The main conclusions are as follows: 1) the different types of coating agents are coated with sodium chloride or calcium chloride. The results of SEM show that the coating agent can be coated on the surface of chloride particles, and the more the amount of coating agent is, the better the coating degree is, and the thicker the coating layer is, the thicker the coating layer is. On the other hand, the coating agent C3 showed a thin coating layer on the surface of sodium chloride particles, and the solution freezing point test showed that the release of chlorine ion from the ice-melting agent prepared with sodium chloride as the melting salt was slower, and the freezing point of the solution prepared by coating agent C1 was higher than that of the solution prepared by the coating agent C1. With the increase of the content of the coating agent, the freezing point of the solution increases gradually, and the slow release property of the solution increases gradually, and the slow release property of the solution increases gradually with the increase of the content of the coating agent. (2) the coating of chloride salt melt ice agent has little effect on the high temperature and low temperature performance of the salt storage asphalt concrete. However, the high temperature and low temperature properties of asphalt concrete mixed with pure chlorine salt are obviously decreased, which indicates that chlorine salt has high temperature effect on asphalt concrete. The influence of low temperature performance can be improved by coating. The coating of organic compounds can greatly reduce the negative effect of chloride on the water stability of asphalt concrete. The water stability of salt storage asphalt concrete prepared by organic Cl chloride salt is the best. 3) compared with pure chlorine salt, the coating chloride melt ice agent reduces the short term ice melting performance of salt storage asphalt concrete. The low melting point C 3 is used as the coating agent, and the low melting point C 3 is used as the coating agent, and the low melting point C 3 is used as the coating agent. The short-term ice melting performance of salt storage asphalt concrete is better than that of salt storage asphalt concrete, and with the increase of coating agent content, the short-term ice melting performance of salt storage asphalt concrete decreases gradually, and the short term ice melting ability of salt storage asphalt concrete will be improved with the increase of the content of ice storage agent. The composition and structure of the coating chloride melting agent have great influence on the long-term ice melting performance of the salt storage asphalt concrete, and the salt storage asphalt concrete prepared by the coating agent C1 has a high salting-out rate after 12 hours of immersion. With the increase of the amount of coating agent, the long-term ice melting performance of salt storage asphalt concrete is gradually enhanced, but when the amount of coating agent increases to A3, the further increase of the amount of coating agent has little effect on the long-term ice melting performance. The results of outdoor snow melting experiment with sodium chloride as ice melting salt and the content of ice thawing agent being 5 show that the asphalt concrete coated with chlorine salt melting agent still has a certain degree of snow melting ability after being soaked for 12 hours. However, the asphalt concrete with pure chlorine salt has almost no snow melting effect after being soaked for 12 hours, which indicates that the long-term effect of salt storage asphalt concrete can be improved by coating chlorine salt.
【学位授予单位】：武汉理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U418.41

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