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1、基于动态老化过程的沥青抗老化性能对比研究纪小平1，许辉2，谭学章3，郑南翔11.长安大学公路学院，陕西西安710064；2.甘肃省公路管理局，甘肃兰州730030;3.甘肃省高等级公路建设开发有限公司，甘肃兰州730030；摘要：旨在运用动态表征模型评价沥青的老化过程，并采用多指标评价方法对比不同沥青的优劣。对4种沥青进行不同时间的RTFOT老化试验，采用动态表征模型拟合，得到沥青针入度、延度、软化点和粘度的老化参数和老化方程；采用灰色关联决策评价方法，以沥青针入度、延度、软化点和粘度的老化参数L和r为评价指标，综合对比不同沥青的抗老化性能。研究结果表明：沥青针入度、软化点、延度和粘度与老
2、化时间存在非线性关系，在开始时刻，老化速率大，后期随着时间的推移，老化速率趋于缓慢，最后达到平衡；沥青的老化过程可用动态模型表征，参数L和r能很好地表征沥青老化过程的老化度和老化速率，不同沥青的不同指标的老化参数排序不一致；采用灰色关联决策评价四种沥青的抗老化性能排序为：室内制备改性沥青优于90号A级基质沥青优于成品改性沥青优于70号A级基质沥青。关键词：沥青；老化；老化方程；灰色关联ComparativeStudyonAnti-agingPerformanceofAsphaltBasedonDynamicAgingProcessJIXiao-ping1,XUHui2,TanXue-zha
3、ng3,ZHENGNan-xiang11.HighwayCollege,Chang’anUniversity,Xi’an710064,Shaanxi,China;2.GansuProvinceAdministrationBureauofHighway,Lanzhou30030,Gansu,China;3.GansuHighwayConstruction＆DevelopmentCo.,Ltd.inGansuProvince,Lanzhou30030,Gansu,ChinaAbstract:Thepurposeofthispaperistousedynamiccharacterizationm
4、odeltoevaluatethedynamicprocessofasphaltagingandcomparetheprosandconsofdifferentasphalt.First,theRTFOTagingtestsatdifferentagingtimeforfourkindsofasphaltarecarriedoutandtheagingtestdataarefittedwithdynamiccharacterizationmodel.Asaresult,theagingparametersandagingequationofpenetration,ductility,sof
5、teningpointandviscosityofdifferentasphaltaredetermined.Then,greyrelationalevaluationmethodisusedtoevaluatetheanti-agingperformanceofdifferentasphalt,whichsettingtheagingparametersLandrofpenetration,ductility,softeningpointandviscosityastheevaluationindexes.Theresultsshowthat:theagingrateofpenetrat
6、ion,softeningpoint,ductilityofasphaltreachesthepeakatthebeginningandbecomessmallerasthevariationofagingtimeandbalancesatlast;TheagingprocessofasphaltcanbedescribedaccuratelybydynamiccharacterizationmodeandparametersLandrcanbeagoodcharacterizationofagingdegreeandagingrate;Thesortofanti-agingpropert
7、iesofthefourasphaltisdeterminedasfollowing:theindoormodifiedasphaltisbetterthanmatrix90asphaltandbetterthanSBSmodifiedasphaltandbetterthanmatrix70asphalt.Keywords:Asphalt;Aging;Agingequation;Greymodeling0引言作者简介:纪
