沥青公路抗高温相变改性沥青的性能研究

Performance of High Temperature Resistant Phase Change Modified Asphalt for Asphalt Highway

针对沥青路面的高温病害问题,研究了沥青路面抗高温相变微胶囊及改性沥青的性能.利用DSC、TG、FTIR、SEM和激光粒度的分析手段,研究了相变微胶囊的储热特征等性能;进而利用三大指标、RTFOT、DSR的试验分析手段,研究了相变改性沥青的高温特性等性能.通过相变微胶囊性能测试得到了相变微胶囊的相变温度和相变潜热、失重曲线、红外光谱图、扫描电镜图,颗粒分布;相变改性沥青的性能试验得到了随微胶囊掺量变化的三大指标、老化指标、高温流变指标.实验结果表明,相变微胶囊拥有良好的储热性能,其热稳定性、化学稳定性良好,颗粒粒径均匀,包裹性好,综合使用性能良好.高速剪切制备的相变改性沥青随微胶囊掺量的增加,抗高温性能明显提升,且在控制掺量的基础上,针入度、延度、老化指标都满足要求,适用于沥青公路路面.

This study investigated the performance of high temperature resistant phase change microcapsules and modified asphalt for coastal asphalt pavement.DSC,TG,FTIR,SEM,and laser particle size analysis were employed to study the heat storage characteristics and other properties of phase change microcapsules.Then the three major indicators,RTFOT,and DSR test analysis were employed to study the high temperature characteristics of phase change modified asphalt.The phase change temperature and phase change latent heat of the phase change microcapsule,weight loss curve,infrared spectrum,scanning electron microscope image,and particle distribution can be obtained from the phase change microcapsule performance test.The three major indicators of change,aging indicators and high-temperature rheological indicators are analyzed through the experiment.Phase change microcapsules have good heat storage performance,good thermal and chemical stability,uniform particle size,good encapsulation,and good comprehensive performance.The high temperature performance of phase change modified asphalt prepared by high-speed shearing increases with the increase of the microcapsule content.On the basis of controlling the content,the penetration,ductility,and aging indicators of the modified asphalt all meet the requirements.It is suitable for asphalt roads pavement.