纳米TiO2/TLA复合改性沥青及混合料性能研究

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LIU Hai

（Henan Jiaotou Zhengping Highway Co.，Ltd.， Zhengzhou 45OOOO，China）

Abstract： In order to study the effect of nano and TLA on the performance of SBS modified asphalt and its mixture，and determinetheoptimalcombinationscheme，theconventionalperformanceandhighandlowtemperaturerheologicalpropertiesof composite modifiedasphalt were studiedbyusing penetration，softening point，ductility，viscosity，shearheologyandbending rheology tests，andtheroad performanceofcompositemodifiedasphalt mixture was evaluatedandanalyzed.Theresults show that the incorporation of TLA or nano - will reduce the penetration and ductility of SBS modified asphalt，and increase the softeningpoint and viscosity．Among them，TLA has agreatinfluence，andthe contentof TLA should not be more than 25% ： Nano-TiOcanimprovethe high temperature shear deformationresistance of asphaltbinder，but atthe same timereduce the low temperature rheological properties of asphalt binder，and its content should not exceed 2% ．TLA andnano - TiO2 have significantefectsonimproving thehightemperaturerutingresistanceandwaterdamageresistanceofaspalt mixture，butatthe same time，TLA will significantly reduce its low temperature performance，and nano - TiO has little effect. Considering the comprehensive performance，the combination of 2% nano -TiO and 25% TLA is recommended as the optimal solution.

Keywords ： nano ；lake asphalt（TLA）；SBS modified asphalt；asphalt mixture；road performance

0 引言

目前，高等级道路大多采用沥青路面，主要在于沥青路面具有行车舒适度高、噪音小、通车时间快和维修简单等优点，但随着道路上车流量不断增长和重载超载车辆的增加，很多沥青路面在经历第一个夏季和冬季后便出现了不同程度的车辙、裂缝等病害。（剩余4916字）