老化对沥青的影响

Abstract:Inordertoinvestigatetheeffecthighandlowtemperatureperformanceofdifferentkindsofasphaltincludingcompositemodifiedasphalt(CCR),rubberpowdermodifiedasphalt(CR)andSBSmodifiedasphalt(SBS),usingdynamicshearrheometer(DSR)andbendingbeamrheometer(BBR)respectivelyforthreekindsofasphaltas-is,rotatingthinfilmovenaging(RTFOT)andpressureafteraging(PAV)asphaltspecimentotemperatureandfrequencyscanningtestandbendingbeamrheologicaltest.Basedonanalysistherheologicalparametersofstoragemodulus(G'),lossmodulus(G''),compositemodulus(G*),phaseangle(δ),ruttingfactor(G*/sin)andCreepstiffnessmodulusofSandCreeprateofm,toevaluatethehighandlowtemperatureperformanceofthepolymermodifiedasphaltbeforeandafteraging.Resultsshowthat:DSRtestandBBRtestcancomprehensiveevaluationthechangecharacteristicsofmodifiedasphaltperformance;Theagingdoesnotaffectthechangetrendofrheologicalparameter;Forthehightemperatureperformance,thevaluesoftheparametersafteragingasawholeissmallerthanbeforeaging,showthatthehightemperaturedeformationresistanceabilityofafteragingisimprovedthanbeforeaging;Forthelowtemperatureperformance,thevaluesofSandmhavegreatinfluenceafteraging,Sisincreasedandmisreducedafteraging,indicatesthatthelowtemperaturecrackresistanceofasphaltisreducedandeasytocrack.Andcomparedwiththetemperature,theinfluenceoftemperatureontheSandmisgreatthantheaging.Keywords:polymermodifiedasphalt;aging;hightemperatureperformance;lowtemperatureperformancetemperature;rheologicalparametersAbstract:Inordertoinvestigatetheeffectofshort-termaging(filmovenaging)andtemperatureonanti-deformationofdifferentkindsofasphaltincludingSBSmodifiedasphalt(SMA),rubberpowdermodifiedasphalt(RPMA)andcompositemodifiedasphalt(CMA),repeatcreeprecoverytestwasconductedbythedynamicshearrheometer(DSR),theanti-deformationindex-HL（calculatedbycomplexshearmodulus-G*）andviscouspartofcomplexshearmodulus-GVwasusedtoevaluatetheanti-deformationofthesekindsofasphaltrespectively.Inaddition,scanningelectronmicroscope(SEM)wasusedtoobservethemicrostructuresofthesekindsofasphalt,thereasonswhytherearedifferentperformancesamongthemaboutanti-deformationwereexplainedfrommicroscopicview.Resultsshowthat:GVandHLcanevaluatetheanti-deformationofmodifiedasphaltunderhightemperatureproperly;themicrostructureofmatrixasphaltandmodifierwerechangedaftershort-termaging,sotheiranti-deformationchanged;theinfluenceoftemperatureonanti-deformationofmodifiedasphaltdependsonthetemperaturesensitivityofasphalt,RPMAhasthebestanti-deformationunderhightemperature.Keywords:polymermodifiedasphalt;anti-deformation;RTFOT;temperature利用流变学原理，采用动态剪切流变仪（DSR）对老化前后的聚合物改性沥青进行动态剪切试验和重复蠕变恢复试验，通过对流变参数储存弹性模量G’、损失弹性模量G’’、复合模量G*、相位角δ、车辙因子G*/sinδ以及蠕变劲度的粘性成分Gv的分析，研究三种聚合物改性沥青的流变性能，同时对三种改性沥青的延迟弹性进行分析。利用弯曲梁流变仪（BBR）对聚合物改性沥青低温性能指标蠕变劲度模量S和蠕变速率m进行测定，以此评定老化前后聚合物改性沥青的低温性能。通过对高、低温流变性能的研究，得到老化作用对沥青高低温性能的影响规律。DobeforeandafterageingofpolymermodifiedasphaltbydynamicsheartestandrepeatedcreeprecoverytestbyusingrheologicalprincipleandDynamicshearrheomrter(DSR),basedonanalysistherheologicalparametersofstoragemodulus(G'),lossmodulus(G''),compositemodulus(G*),ruttingfactor(G*/sin),phaseangle(δ)andGV,studytherheologicalpropertiesofthreekindsofpolymermodifiedasphalt,atthesametimedelayedelasticforthreekindsofmodifiedasphaltalsostudy.UsingBendingBeamRheometer(BBR)tomeasurepolymermodifiedasphaltlowtemperatureperformanceindicatorscreepstiffnessmodulus(S)andcreeprate(m)toassesstheperformanceofpolymermodifiedasphaltbeforeandafteraginginlowtemperature.Throughtheresearchonthehighandlowtemperaturerheologicalproperties,gettheinfluencelawaboutagingeffectsinhighandlowtemperature.AgeingofpolymermodifiedasphalthightemperatureandlowtemperatureperformanceparametersTheinfluencelawaboutagingeffectsinhighandlowtemperatureperformanceparameters