PEG/SiO_2相变颗粒对沥青混合料储热及高温性能的影响  

Effect of PEG/SiO_2 Phase Change Particles on Heat Storage and High Temperature Performance of Asphalt Mixture

作　　者：李文虎[1] 何丽红[1,2] 朱洪洲[1,2] 佟禹 

机构地区：[1]重庆交通大学土木建筑学院,重庆400074 [2]重庆交通大学交通土建工程材料国家地方联合工程实验室,重庆400074

出　　处：《公路交通科技》2015年第4期16-20,共5页Journal of Highway and Transportation Research and Development

基　　金：国家自然科学基金项目(51178491);交通运输部科技项目(2012-319-814-200);广西省交通运输厅科技计划项目(桂交科2013-11)

摘　　要：利用相变材料物相转变时吸收或释放大量热量而本身温度保持不变的特性,用溶胶-凝胶法制备PEG/Si O2相变颗粒,并将其以等体积替代法替代粒径小于0.6 mm的细集料应用于沥青混合料中。考察了PEG/Si O2相变颗粒对4种不同级配的沥青混合料温度敏感性及高温稳定性的影响。结果表明,PEG/Si O2相变颗粒的掺入可降低沥青混合料的温度敏感性,并且掺量越大效果越明显,当其掺量达到5%时,可在自然光照条件下降温5℃以上,而级配对沥青混合料的温度敏感性影响不明显。PEG/Si O2相变颗粒对沥青混合料的高温稳定性影响与相变颗粒的掺量及沥青混合料的级配类型有关。相变颗粒的掺入在降低沥青混合料最高温度的同时,可降低沥青混合料发生高温车辙病害的可能性。Owing to the feature of PCM that could absorb or release a large amount of heat and keep temperature constant during phase transition, the PEG/SiO2 phase change particles prepared by Sol-Gel method are added into Hot Mix Asphalt （HMA） mixture to replace the fine aggregate less than 0. 6 mm by the equal-volume method. The influence of PEG/SiO2 phase change particles on the temperature sensibility and high temperature stability of 4 graded HMA are studied. The result shows that （ 1 ） the addition of PEG/ SiO2 phase change particles could reduce the temperature sensibility of HMA, the effect is more obvious with the increase of the content, the maximum cooling of HMA adding 5% PEG/SiO2 phase change particles is over 5 ℃ under natural light, and the influence of different graduations on temperature sensibility of HMA are not obvious; （2） the influence of the phase change particles on the high temperature stability of HMA is related to the amount of phase change particles and the graduation type of HMA; the addition of the phase change particles could reduce the peak temperature of HMA, and could alleviate the rutting disease of asphalt pavement at high temperature.

关 键 词：道路工程 沥青混合料 等体积取代 相变材料 高温稳定性 

分 类 号：U414[交通运输工程—道路与铁道工程]