骨料级配对相变沥青混合料性能的影响

Effect of Gradation on the Performance of Phase Change Asphalt Mixture

相变沥青混合料是一种可以调节沥青混凝土路面温度的新型功能性路面材料,其中,沥青混合料骨料级配对相变沥青混合料的路用性能和调温性能的影响值得深入研究。选择两种复合定型相变材料(composite-shaped phase change materials,CPCM)石蜡/膨胀石墨/高密度聚乙烯(paraffin/expanded graphite/high-density polyethylene,PHDP)和DTC道路温度调节材料,首先利用傅里叶变换红外光谱仪(Fourier transform infrared spectrometer,FTIR)试验,对CPCMs与沥青之间的反应进行了定性分析。其次,分别制备级配类型为AC-16与AC-20的相变沥青混合料,通过路用性能试验和调温试验评价不同骨料级配对相变沥青混合料路用性能与调温效果的影响。结果表明,两种CPCM与沥青之间均为物理反应;相比级配类型AC-16,AC-20可以显著提高含PHDP的相变沥青混合料的路用性能与调温效果,但是对于含DTC道路温度调节材料的相变沥青混合料的改善效果不显著。

Phase change asphalt mixture is a new functional pavement material that can regulate the temperature of asphalt concrete pavement.Two composite-shaped phase change materials(CPCM)of paraffin/expanded graphite/high-density polyethylene(PHDP)and DTC road temperature regulating material were selected.Firstly,Fourier transform infrared spectroscopy(FTIR)was used for testing,and qualitative analysis was conducted on the reaction between CPCMs and asphalt.Secondly,phase change asphalt mixtures with grading types AC-16 and AC-20 were prepared,and the impact of different aggregate grading on the road performance and temperature control effect of phase change asphalt mixtures were evaluated through road performance tests and temperature control tests.The results indicate that there is a physical reaction between both types of CPCM and asphalt.Compared to the grading type AC-16,AC-20 can significantly improve the road performance and temperature control effect of phase change asphalt mixtures containing PHDP,but the improvement effect on phase change asphalt mixtures containing DTC is not significant.