本文選題：瀝青路面　切入點：融冰劑　出處：《武漢理工大學》2015年碩士論文　論文類型：學位論文

【摘要】：瀝青路面在冬季易積雪結冰,極易引發(fā)交通事故的發(fā)生。摻加氯鹽類融冰劑的蓄鹽瀝青混凝土作為一種主動融雪化冰方法,得到了越來越多的關注。然而,氯鹽融冰劑的摻入會影響瀝青混凝土的路用性能,同時隨著氯鹽融冰劑的溶解析出也會降低瀝青路面的融雪化冰性能。如何降低氯鹽融冰劑對瀝青混凝土性能的影響,并延長其融雪除冰效果,對于蓄鹽瀝青混凝土的發(fā)展與應用具有重要意義。本文采用有機包覆的方法制備了包覆氯鹽融冰劑,對包覆氯鹽融冰劑的結構進行了表征,研究了不同類型有機物包覆氯鹽融冰劑對瀝青混凝土的路用性能、融冰性能及其長效性。主要結論如下:(1)將不同類型包覆劑對氯化鈉或氯化鈣進行包覆處理,制備出了包覆氯鹽融冰劑。掃描電鏡測試表明,包覆劑可以較好地包覆在氯鹽顆粒的表面,包覆劑用量越多,包覆程度越好。包覆劑C1、C2制備的融冰劑包覆層較厚,而包覆劑C3則在氯化鈉顆粒表面呈現(xiàn)較薄的包覆層;溶液冰點測試表明,采用氯化鈉作為融冰鹽制備的融冰劑氯離子釋放更為緩慢,包覆劑C1制備的融冰劑溶液冰點較高,緩釋性能更好,而隨著包覆劑摻量的增大,溶液冰點逐漸升高,緩釋性能也逐漸增強。(2)包覆氯鹽融冰劑對蓄鹽瀝青混凝土的高溫、低溫性能影響不大,而摻加純氯鹽的瀝青混凝土高溫性能和低溫性能則明顯降低,表明氯鹽對瀝青混凝土高溫、低溫性能的影響可以通過包覆來改善。有機物的包覆作用可以極大地降低氯鹽對瀝青混凝土水穩(wěn)定性能的負面影響,其中采用有機物C1氯鹽制備的蓄鹽瀝青混凝土的水穩(wěn)定性能最優(yōu)。(3)與純氯鹽相比,包覆氯鹽融冰劑降低了蓄鹽瀝青混凝土的短期融冰性能。采用低熔點的C3作為包覆劑,蓄鹽瀝青混凝土的短期融冰性能較好,且隨著包覆劑摻量的增大,短期融冰性能逐漸降低。融冰劑摻量的增大會提升蓄鹽瀝青混凝土的短期融冰能力,選用鈣作為融冰鹽短期融冰能力更強。(4)包覆氯鹽融冰劑的組成與結構對蓄鹽瀝青混凝土的長期融冰性能影響較大。采用包覆劑C1制備的蓄鹽瀝青混凝土浸泡12h后鹽析出速率大,冰點粘附力低,長效性較好;隨著包覆劑摻量的增大,蓄鹽瀝青混凝土的長期融冰性能逐漸增強,但包覆劑摻量增大至A3后,繼續(xù)增大包覆劑用量對長期融冰性能影響不大;采用氯化鈉作為融冰鹽,融冰劑摻量為5%時,長期融冰性能最佳。(5)室外融雪實驗表明,包覆氯鹽融冰劑制備的蓄鹽瀝青混凝土,在浸泡12h后仍具有一定程度的融雪能力,而摻加純氯鹽的瀝青混凝土在浸泡12h后則幾乎不具備融雪效果,這表明對氯鹽進行包覆提高了蓄鹽瀝青混凝土的長效性。
[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.
【學位授予單位】：武漢理工大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：U418.41

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