摘要
将十四烷微胶囊相变调温剂(MEPCTA)以0.3%掺量掺入沥青混合料中,制成沥青混合料室外调温模型,通过实时监测调温模型内部不同位置温度,分析调温模型内部温度场变化情况.进一步提出分析调温模型内部温度的新方法——特征温度界面,研究调温过程中模型内部MEPCTA的调温状态.结果表明:掺加MEPCTA的沥青混合料室外调温模型整体升降温速率与幅度均低于普通沥青混合料模型,最大温差1.7℃;模型内调温剂完成相变是由外而内逐步进行;升温阶段,环境最高温度越高,相变调温剂越早开始潜热调温,可较大程度发挥调温作用;降温阶段,环境温度越低,调温剂越早开始释放热量.沥青混合料中MEPCTA的掺入,可降低其温度敏感性,延缓温度峰值出现,并降低峰值温度.
Tetradecane microcapsule phase change temperature regulator(MEPCTA)was added into asphalt mixture at 0.3%,and the outdoor temperature regulation model of asphalt mixture was made.By real-time monitoring the temperature at different positions inside the temperature control model,the change of temperature field inside the temperature control model was analyzed.Furthermore,a new method-characteristic temperature interface was proposed to analyze the internal temperature of the temperature adjustment model,and the temperature adjustment state of MEPCTA in the model during temperature adjustment was studied.The results show that the overall heating and cooling rate and amplitude of the outdoor temperature control model of asphalt mixture with MEPCTA are lower than those of ordinary asphalt mixture model,and the maximum temperature difference is 1.7℃.In the model,the phase change of temperature regulator is gradually carried out from outside to inside.In the heating stage,the higher the maximum temperature of the environment,the earlier the phase-change temperature regulator starts latent heat temperature regulation,which can play the role of temperature regulation to a greater extent.In the cooling stage,the lower the ambient temperature,the earlier the temperature regulator starts to release heat.Adding MEPCTA into asphalt mixture can reduce its temperature sensitivity,delay the appearance of temperature peak and reduce the peak temperature.
作者
王小庆
马骉
刘丰玮
WANG Xiaoqing;MA Biao;LIU Fengwei(School of Highway,Chang’an University,Xi’an 710064,China;Shandong Provincial Communications Planning and Design Institute,Jinan 250031,China)
出处
《武汉理工大学学报（交通科学与工程版）》
2020年第6期1020-1026,共7页
Journal of Wuhan University of Technology（Transportation Science & Engineering）
基金
交通部高层次技术人才培养项目资助(2018-019)。
关键词
沥青混合料
微胶囊相变调温剂
温度场
特征温度界面
asphalt mixture
micro-encapsulated phase change thermoregulation agent
temperature field
characteristic temperature interface
