通过溶胶-凝胶法制备出聚乙二醇/TiO₂/石墨烯复合相变材料,对其进行FT-IR、XRD、DSC、TG等测试表征,并将其作为改性剂添加到沥青中,研究不同掺量的改性剂对改性沥青常规指标、高温流变性能及耐老化性能的影响。实验结果表明:复合相变材料的结晶性能良好,各组分间只是物理作用,并未产生化学反应;复合相变材料的相变潜热较高,热稳定性好,适用于沥青工程;随着改性剂掺量的增加,改性沥青的软化点上升,针入度与延度均出现了下降;改性沥青的车辙因子增大,相位角降低,表明改性剂中的聚乙二醇起到了显著的储热作用,明显地改善了沥青的高温稳定性能;通过旋转薄膜烘箱老化实验发现,老化后的改性沥青的低温残留延度及残留针入度比均高于老化后的基质沥青,表明改性剂的掺入能有效改善沥青的耐老化性能。

A novel composite phase change material (PCMs) of PEG/TiO₂/graphene nanoplates was prepared by sol-gel method,FT-IR,XRD,DSC,TG were utilized to test the performance of PCMs.PCMs were added into asphalt as modifying agent,for purpose of investigating the impact of dosage of modifying agent on the regular indices,high temperature rheology and aging resistant performance.The results showed that there was only physical interaction among the components,PCMs exhibited good enthalpy and thermal stability and can be applied to asphalt road.With the increase of the content of modifying agent,the softening point increased,while the penetration and ductility decreased.The rutting factor increased,the phase angle of modified asphalt decreased,indicating that the PEG in modifying agent played a remarkable role in heat storing,as a result,the high temperature stability of modified asphalt significantly improved.The resistance aging test of modified asphalt were explored by means of RTFOT,results proved that the addition of modifying agent can significantly improve the aging resistant performance of asphalt.