换热管道对太阳能集热沥青路面性能的影响研究

发布时间：2018-01-18 12:38

  本文关键词：换热管道对太阳能集热沥青路面性能的影响研究　出处：《武汉理工大学》2015年硕士论文　论文类型：学位论文

  更多相关文章： 换热管道 导热沥青混凝土 粘结性能 冻融循环 路用性能

【摘要】：太阳能具有取之不尽用之不竭、对环境影响小等优点,迅速成为各国竞相关注和发展的重点。沥青路面太阳能集热技术是太阳能热利用的一种,具有集热面积巨大的优势,采用在沥青路面中铺设换热管道,通过换热介质将路面中的热能进行收集利用,这对调控沥青路面的服役温度和缓解目前紧张的能源形势具有十分重要的意义。针对以往的研究主要侧重于其功能性研究和路面集热性能影响因素的分析,而对换热管道引起的沥青路面性能的变化缺乏认识这一现状,本文开展了冻融循环次数对换热管道与沥青混凝土粘结性能以及换热管道对沥青混凝土路用性能影响规律的研究,探索了改善其界面粘结性能的方法。首先,利用石墨代替矿粉制备出导热性能良好的沥青混凝土,采用固定管道轮碾的方法制备出埋管沥青混凝土,通过中心拔出实验研究了冻融循环对换热管道与沥青混凝土粘结性能的影响规律。结果表明,换热管道与沥青混凝土之间的粘结强度和有效粘结长度有关,随着冻融次数的增加,换热管道与沥青混凝土的平均粘结强度大幅降低,并可以通过分段的线性函数来表示;第二,采用乳化沥青、环氧树脂和环氧沥青三种粘结材料对换热管道表面进行处理,改善了换热管道与沥青混凝土粘结性能,其粘结强度分别提高了1.37倍、1.31倍和3.01倍;第三,车辙实验和蠕变实验结果表明,换热管道的埋入能提高沥青混凝土的高温性能;低温三点弯曲实验可以发现,在0℃时,埋管沥青混凝土的最大弯拉应变和开裂能比普通沥青混凝土降低了42.84%和31.5%,然而埋管沥青混凝土在低温极限工作温度0℃条件下的最大弯拉应变和开裂能与普通沥青混凝土在-10℃时的值接近;最后,采用四点弯曲疲劳实验研究了换热管道对沥青混凝土疲劳性能的影响,结果表明,换热管道的埋入对沥青混凝土的疲劳寿命降低明显,通过换热管道表面处理可以提高埋管沥青混凝土的疲劳性能。
[Abstract]:Solar energy has the advantages of inexhaustible and small impact on the environment and has become the focus of attention and development in many countries. Solar energy collection technology of asphalt pavement is a kind of solar energy thermal utilization. With the advantage of huge heat collection area, the heat transfer pipe is laid in the asphalt pavement, and the heat energy in the road surface is collected and utilized by heat transfer medium. This is of great significance for regulating the service temperature of asphalt pavement and alleviating the current energy situation. In view of the previous studies, it is mainly focused on the functional research and the analysis of the influencing factors of pavement heat collection performance. However, there is a lack of understanding of the performance change of asphalt pavement caused by heat transfer pipeline. In this paper, the influence of freezing and thawing cycle times on the adhesion between heat transfer pipeline and asphalt concrete and the influence of heat transfer pipe on pavement performance of asphalt concrete are studied, and the methods to improve the interface bond performance of asphalt concrete are explored. The bituminous concrete with good thermal conductivity was prepared by using graphite instead of ore powder, and the buried pipe asphalt concrete was prepared by the method of fixed pipe wheel mill. The effect of freeze-thaw cycle on the bond performance between asphalt concrete and freeze-thaw heat transfer pipe was studied by central pull-out experiment. The results show that the bond strength and effective bond length between heat transfer pipe and asphalt concrete are related. With the increase of freezing and thawing times, the average bond strength between heat transfer pipe and asphalt concrete decreases significantly, and can be expressed by piecewise linear function. Secondly, the surface of heat transfer pipe is treated with emulsified asphalt, epoxy resin and epoxy asphalt, which improves the bond performance between heat transfer pipe and asphalt concrete. The bond strength increased by 1.37 times, 1.31 times and 3.01 times, respectively. Thirdly, the results of rutting test and creep test show that the high temperature performance of asphalt concrete can be improved by embedding heat transfer pipe. At 0 鈩，

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