微胶囊相变调温剂与沥青混合料比热容测定分析

发布时间：2018-05-02 19:49

本文选题：微胶囊型相变调温剂 + 沥青混合料　；参考：《长安大学》2014年硕士论文

【摘要】：沥青路面受温度影响较为明显，低温环境下的结霜、开裂，高温环境下的车辙等与温度相关的病害严重影响了沥青路面的使用性能，改善和提高沥青路面低温抗裂性和高温稳定性，一直是国内外学者长期研究的问题。项目组在前期研究中研制了公路用微胶囊型相变调温剂（Micro-encapsulated phase change thermoregulation agent，简写为MEPCTA），研究表明相变调温剂掺入沥青混合料可以利用其相变潜热特性，起到主动调控沥青混合料温度变化、改善沥青路面温度场的作用，从而提高沥青路面应对不利的温度变化的能力。研究进一步发现，比热容是相变调温剂和沥青混合料的主要热性质参数之一，也是调温效果分析必需的材料参数之一，但相关研究较少。本研究在小容量试样比热容测试方法的基础上，根据大体积复合材料的特点，从控制保温效果和修正系统热量散失出发，，提出了大容量试样比热容测定设备与方法，并对微胶囊相变调温剂和沥青混合料的比热容进行了测试分析。测试分析得出：在升温过程中，微胶囊相变调温剂在相变温度域内的升温速率会有不同程度的减小，其比热容会随着温度的变化而变化，尤其是在相变温度域内会产生明显的峰值；通过分段的方程回归得出相变调温剂的比热容——温度推荐方程，进而对该方程求积分得到调温剂的相变焓和潜热；掺加相变调温剂的沥青混合料在升温过程中温度曲线没有明显的拐点，升温速率没有明显变化，比热容同样会随着温度变化，通过分段回归曲线推荐出沥青混合料的比热容——温度方程；在满足路用性能要求的前提下，微胶囊相变调温剂的掺量改变不会对影响沥青混合料的比热容产生显著影响。
[Abstract]:The influence of temperature on asphalt pavement is obvious. Frosting, cracking, rutting and other temperature-related diseases in low temperature environment seriously affect the performance of asphalt pavement. Improving and improving the low temperature crack resistance and high temperature stability of asphalt pavement has been a long-term problem studied by scholars at home and abroad. In the previous research, the project group developed the micro-encapsulated phase-change temperature-adjuster (phase change thermoregulation agent,) for highway. The research shows that the mixing of the phase-change thermostat into the asphalt mixture can take the advantage of its latent heat property of phase change and play an active role in regulating the temperature change of the asphalt mixture. The function of temperature field of asphalt pavement is improved, and the ability of asphalt pavement to deal with unfavorable temperature change is improved. It is further found that specific heat capacity is one of the main thermal property parameters of phase change adjuster and asphalt mixture, and is also one of the necessary material parameters for the analysis of temperature regulation effect, but there are few related studies. Based on the measurement method of specific heat capacity of small volume samples and according to the characteristics of large volume composite materials, the equipment and method for measuring specific heat capacity of large capacity samples are put forward in this paper in order to control the heat preservation effect and correct the heat loss of the system. The specific heat capacity of microencapsulated phase change thermostat and asphalt mixture was tested and analyzed. The test results show that the heating rate of the microencapsulated phase change adjuster in the phase change temperature domain will decrease in varying degrees, and its specific heat capacity will change with the change of temperature. The specific heat volume-temperature recommendation equation of the phase change adjuster is obtained by the piecewise equation regression, and the phase change enthalpy and latent heat of the thermostat can be obtained by integrating the equation. There is no obvious inflection point in the temperature curve of asphalt mixture mixed with phase change temperature-adjuster, and the specific heat capacity will also change with the temperature. The specific heat volume-temperature equation of asphalt mixture is recommended by the piecewise regression curve, and the specific heat capacity of asphalt mixture will not be significantly affected by the change of the content of microencapsulated phase change thermostat on the premise of satisfying the requirements of road performance.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U414

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