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第9卷第15期2009年8月科学技术与工程Vol19No115Aug.2009167121819(2009)1524554205ScienceTechnologyandEngineeringZ2009Sci1Tech1Engng1交通运输永久性沥青路面沥青稳定基层性能1,212刘福明王端宜孙红燕(华南理工大学土木与交通学院12,广州510640;南昌工程学院土木工程系,南昌330099)摘要对永久性沥青路面的沥青稳定基层及其混合料进行路用性能试验分析研究,试验包括水稳定性试验、车辙试验及疲劳试验等,试验结果表明,富沥青稳定基层的抗水损害、抗疲劳性能好于传统的沥青混合料。关键词沥青稳定基层富沥青永久性沥青路面性能试验中图法分类号U416.217;文献标志码AInrecentyears,thefreewayhavehadrapiddevel2mentisgettingshorterbecausethepavementkeepslos2opmentinChina,andsemi2rigidbasehasbeentheingthestructuralcapacitymainlyduetothecumulativemainpavementstructureinChinaformanyyears.damageoccurredintheasphaltlayer.Thus,iftheex2However,therearemuchsevereearlydistressesinistingpavementhasseriousfatiguecrackinganddeform2someasphaltpavements.Structrualdefectofsemi2rigidation,anoverlaytoextenditslifemightbeineffectivepavamentislikelytobeoneofthereasons.Flexiblefromstructuralandeconomicalpointofview.baseasphaltpavementsareusedwidelyinmanycoun2Toovercomethoseproblems,theconceptofaper2triesduetotheirgoodperformance,butfewinChina.petualpavementproposedbyELLPAG(EuropeanPer2AsphaltpavementsinChinahavebeenusuallyde2petualPavementGroup),anapproachtoprolongthesignedfor152yearlifeexpectancies.but,aftertheservicelivesofasphaltpavements,hasbeenconsidered(3—5)yearsofserviceperiodmanyseriousprematureinthisstudy.Thedefinitionoftheperpetualpavementfailureofasphaltpavementoccurred,thepavementisatypeofpavementwherenosignificantdeteriorationshouldbereconstructedtogainitsoriginalstructuralca2willdevelopinthefoundationsortheroadbaselayerspacity.However,duetothesignificantlyincreasingprovidedthatcorrectsurfacemaintenanceiscarriedout.trafficvolumeandinsufficientbudget,mostofoldpave2ThebasicideaofaperpetualpavementisthatHMAmentsinChinahavebeenpartlyrehabilitatedusingapavementsoveraminimumstrengtharenotlikelytoex2(2—4)cmthickoverlayinsteadofreconstruction.Inhibitstructuraldamageevenwhensubjectedtoveryhightrafficflowsoverlongperiodsoftime.Rather,de2general,theperformanceperiodofanewlyconstructedteriorationseemstoinitiateinthepavementsurfaceaspavementislongerthan10yearsbeforeamajorrehabil2eithertop2downcrackingorrutting.Ifsurface2initiateditationlikeanoverlayaftermilling.However,afterthecrackingandruttingcanbedetectedandremediedbe2firstrehabilitation,theperformanceperiodofthepave2foretheyimpactthestructuralintegrityofthepavement,2009年4月14日收到thepavementdesignlifecouldbegreatlyincreased.第一作者简介:刘福明,男,副教授,博士研究生,研究方向:路面工TheELLPAGdefinitionabovecamefromtheintention程结构与材料性能。E2mail:yancyliufuming@163.com。toavoidlimitingtheconcepttoaspecificlife(e.g.30, 15期刘福明,等:永久性沥青路面沥青稳定基层性能455540or50years),whichhasdoneinsomestudies.Inthispaper,thefunctionaldefinitionofELLPAGhasbeenadopted,whichconsequentlyimpliesthatallpave2mentlayers,exceptthesurfacing,areconsideredaspermanent.Onlyperiodicalrehabilitationforthesurfacelayermightbeneededfortheentiredesignlife.Thatmeansatotalreconstructionofaroadpavementishard2lypossibleorevenimpossible.Thisisoneoftherea2Fig.2Typicalperpetualpavementsonsfordevelopingtheperpetualpavementconcept.Fig.1,Fig.2showsatypicalperpetualpave2ThemajorobjectiveistodevelopthefullasphaltmentandaconventionalasphaltpavementstructureinmixtureapplicabletotheasphalttreatedbaselayerforChina.Ascanbeseeninthisfigure,theasphaltlayerperpetualasphaltpavements.VariouslaboratorytestsoftheperpetualpavementusesathickerHMApave2havebeenconductedtoevaluatetheperformancechar2mentthantheconventionalasphaltpavementoveraacteristicssuchasfatiguecrackingandpermanentde2strongsubbasedesignwiththreelayers.Theasphaltformation.Inadditiontothelaboratorytests,afulllayeroftheperpetualpavementconsistsofarutresist2scaleperformancetestinghasbeenperformedtoevalu2ant,impermeable,andwearresistantsurfacecourse,atethestructuralcapacityandpavementperformanceofarutresistantintermediatecourseandafigureresistantperpetualasphaltpavements.asphalttreatedbase(ATB)layer.Fortheperpetualpavement,Twoapproachescanbeusedtoresistfa21Materialsandmixturedesigntiguecrackinginthebaselayer.First,thetotalpave21.1AsphaltbindertestmentthicknesscanbemadegreatenoughsuchthatthePanjinheavytransportasphaltAH290wasused,tensilestrainatthebottomofthebaselayerisinsignifi2andvariousbindertestswereconductedtoevaluatethecant.Alternatively,theHMAbaselayercouldbephysicalandmechanicalpropertiesofthebinders.Themadeusinganextra2flexibleHMA.ThiscanbemostimportanttestsresultsarepresentedinTable1.easilyaccomplishedbyincreasingtheasphaltcontent.Table1ResultsofAsphaltBinderPropertiesThin2FilmPropertyResultOvenTest(163℃,5h)Penatration(25℃,0.1mm)93SofteningPoint/℃47.6Ductility/cm(25℃)>100>100-3)(25℃)1.0198Density/(g·cmWaxContent/%2.3Fig.1ConventionalasphaltpavementQualityloss/%0.003Therefore,thedevelopmentofahighercontentPenatrationProportion/%65.3binderanddurableATBmix(FullAsphaltMixture)T1.2-17.9shouldbeakeyelementforthesuccessfulimplementationT80048.3ofthedesignconceptoftheperpetualasphaltpavement.Note:CorrelationcoeffientR=0.997inT1.2,T800. 4556科学技术与工程9卷1.2AggregateblowsisappliedtoformMarshallspecimen,andtheLimestoneproducedinGuangdongwasusedasgeometryofthespecimensfortheMarshalltestsare3aggregate,whichdensityis2.7214g/cmandcrushed152.4mmindiameterand95.3mminheight.stonevalue19.2%.MineralfillerwasmadebyTheoptimumasphaltcontentsforthetwomixes3groundinglimestone,whichdensityis2.6897g/cm.were3.8%fortheconventionalgradationmixand4.1.3GradationType85%forthedense2skeletongradationmix,theairvoidToproduceasphaltconcretespecimens,twotypeswere4.9%and3.52%,respectively.ofaggregategradationsforthebaseofperpetualasphaltpavementwereselectedasshowninTable2.Ascan2PropertiestestingbeseeninthisTable2,theconventionalaggregategra2dationofAC225mixtureandadense2skeletongradationThesamplestobeusedinthemoisturesuscepti2ofATB225designedbythecoarseaggregateviodfillingbilitytestswerecompactedusingaMarshallcompac2(CAVF)methodwithanominalmaximumaggregatetor,whereasaSuperpavegyratorycompactorwasusedsizeof25mmwereused.Andtheconventionalaggre2forthecompactionofthesamplestobeusedinthein2gategradation(AC225)wasmostwidelyusedinmanydirecttensilefatiguetests.ThespecimengeometryforlocationsthroughoutChina.thefatiguetestsis150mmindiameterand50mminheight.ThespecimenstobeusedinthewheeltrackingTable2GradationsofAsphaltMixturetestswereproducedinthegeometryof300mm×300AggregategradationPercentagepassing/%mm×50mmusingaslabcompactor.sievesizes/mmConventionalgradationDense2skeletongradationToevaluatethepropertiesofthedense2skeleton31.5100100ATB—25gradationandmix,variouslaboratorytests26.59597.5wereperformed.Thelaboratorytestsforthehigher19.08079contentbinder(FullAsphalt)Mixtureincludethe16.071.565.8moisturesusceptibility,wheeltracking,andindirect13.263.555tensilefatiguetests.9.552.540.74.753824.92.1Moisturesusceptibilitytest2.362821.9Themoisturesusceptibilityoftheasphaltmixtures1.1821.515.9wasevaluatedaccordingtothetestproceduredescribed0.615.212.7inChineseprofessionalcriterion(JTJ052-2000).0.310.59.1Freeze2thawsplittingtestoftheconventionalACgra20.158.27.6dationanddense2skeletonATBgradationmixwere0.0754.06.0used,andtestresultsaresummarizedinTable3.AndCombiningthetwoaggregategradationdescribedasshowninTable3,theTSRvaluesobtainedfromtheabove,twodifferenttypesofasphaltmixtures,conven2bothmixesaregreaterthan75%thatsatisfiesthemixtionalAC225gradationanddense2skeletonATB225designspecification.However,theTSRvalueofthegradation,wereproducedforthelaboratorytesting.Thedense2skeletonATBgradationmix(97.32%)isaboutoptimumasphaltcontentsweredeterminedaccordingto10%greaterthanthatoftheconventionalACmixthebigMarshallmixdesignmethod.Double2side112(87.69%). 15期刘福明,等:永久性沥青路面沥青稳定基层性能4557Table3Freeze2thawsplittingexperimentalresultstheperpetualasphaltpavements.ConventionalDense2skeleton2.4FullscalepropertytestIndexgradationmixgradationmixTwoasphaltpavementstructuresections(dense2Bituminouscontent/%3.84.85skeletonATB—25andconventionalACpavement)forNon2frostthawing/MPa0.9751.121fullscaleacceleratedpavementtestingareconstructed.Frostthawing/MPa0.8551.091designmethod.ThethicknessofATBandconventionalTSR/%87.6997.32ACforthetwostructuresectionswere12cm.2.2WheeltrackingtestInordertosimulatethelargeamountofloadinginThewheeltrackingtestswereconductedattheashortperiod,theacceleratedpavementtester(APT)60℃oftemperaturetoevaluatethepermanentdeform2isusedinthisstudy,itisavitaltoolforpavementationcharacteristicsofasphaltmixtures.Thedynamicperformanceevaluation.TheAPTcanbedrivenback2stabilityvalueofthedense2skeletonATB—25mixiswardsandforwardsover12.5mlengthofpavement.It1566times/mmandtheconventionalACmixcanapplythe11tonmaximumwheelloadatspeedof1238times/mm.Itcanbeconcludedfromthecompari2upto17km/htoacceleratethepavementdistress.Itsonthatthedense2skeletonATB—25mixhaveabetterisalsopossibletosimulatethelateralwanderingofrealperformancetoreducethepermanentdeformation.traffic.Theinstrumentationandcontrolsystemisin22.3FatiguepropertytesttendedtocontroltheAPToperationsystematically,Fatiguetestingwasperformedusingaservo2hy2collectalltheinformationrelatingtooperation(speed,draulicclosedlooptestingequipmentmanufacturedbylocation,loadlevel),andmanagethedatasuchasMTS2810.Allthetestswereconductedintheindirecttemperature,deformation,stress,andstraingatheredtensilemode.Thenumberofloadrepetitionsatwhichfromthedifferenttypesofsensor.thecurrentstiffnessdecreasesto50%oftheinitialval2Tomeasurethetensilestrainvalues,straingaugesueisdefinedasthefatiguelifeofspecimen.(ProducedbyCTL)wereinstalledatthebottomoftheTable4ResultsofFatiguetestasphaltlayerduringtheconstruction.ThetensilestrainFatigueLifeFatiguecoefficientvaluesweremeasuredatthe500samplingratefor60sMixture(0.5P)/timesabR2duringtheloadingtestsusingadynamicdatalogger.Conventionalgradationmix30185×10-18-5.1460.998ThetensilestrainsatthebottomoftheasphaltlayerDense2skeletongradationmix43561×10-21-6.1860.793weremeasuredtoevaluatethestructuralcapacityoftheTable4showsthefatiguetestresultsofthetwotwopavementsections.Table5showsthetensilemixtures.Itcanbeseenfromtheresultsthattheresist2strainsmeasuredundervariousloadlevelsforthetwoancetofatiguecrackingofthedense2skeletonATBmixpavementsections,respectively.Ascanbeseenintheisbetterthanthatofconventionalmix.Thehighcon2table,thefatiguelifeofthedense2skeletongradationtentbinderandlargeamountofasphaltmortarintheATBmixpavementwillbemuchlongerthanthecon2dense2skeletonATBmixfilledtheaggregatevoidsandventionalmixbecauseofthesmallertensilestrainsinpercentairvoidsisthelow.Thisdecidesthatthethedense2skeletongradationATBmixpavement.Itisdense2skeletonATBmixhasgoodflexibility.Itcanbealsoknownfromthisthatthetensilestrainvaluesatthesaidthatthefatigueresistanceofthedense2skeletonbottomoftheasphaltlayerfortheATBsectionswereATBmixisbetterthanthatoftheconventionalmixforlowwhentheasphaltlayerthicknessesoftheATBsec2 4558科学技术与工程9卷tionswerenotthickerthanthoseoftheconventionallayeroftheperpetualasphaltpavements.Itcanavoidsections.Allthetensilestrainvaluesmeasuredfromstructuraldamageofpavement,andthepavementde2thetestsectionsarewithinthefatigueendurancelimitsignlifecouldbegreatlyincreased.of70microstrain.ReferencesTable5Tensilestrainwithchangeofdualwheelload1Chineseprofessionalcriterion.TechnicalspecificationsforconstructionTensilestrain(με)Dualwheelload/tofhighwayasphaltpavements(JTGF40—2004).Beijing:TheDense2skeletonATBConventionalsectionsPeoplepsCommunicationsPress,20044.353.860.22Chineseprofessionalcriterion.Standardtestmethodsofbitumenand5.259.665.9bituminousmixturesforhighwayengineering(JTJ052—2000).Bei26.264.670.1jing:ThePeoplepsCommunicationsPress,20003Chineseprofessionalcriterion.Specificationsfordesignofhighwayas2phaltpavement(JTGD50—2006).Beijing:ThePeoplepsCommuni23ConclusionscationsPress,20064ShaQinglin.TheearlydestroyofasphaltpavementofhighwayandAsfarasdense2skeletonATBgradationandmixpreventions.Beijing:PeopleCommunicationsPress,2001forthebaselayeroftheperpetualasphaltpavementsis5CarpenterSH,GhuzlanKA,ShenS.Fatigueendurancelimitsforhighwayandairportpavements.In:TransportationResearchRecordconcerned,Themoisturesusceptibility,indirecttensile1832.Washington(DC):TRB,NationalResearchCouncil,2003fatigue,wheeltrackingtestsandfullscaleaccelerated6NewcombDE,BuncherM,HuddlestonIJ.Conceptsofperpetualpavementtestwereperformedtoevaluatetheperform2pavements.TransportationResearchCircularNo.503.Washingtonancecharacteristicsofthedense2skeletonATBmix2(DC):TRB,NationalResearchCouncil,2001ture.Andcomparedwithconventionalone,thedense27EuropeanAsphaltPavementAssociation.Long2LifeAsphaltPavementsskeletonATBmixturebeinghighcontentasphaltbinder–Technicalversion.Belgium:2007(FullAsphaltMixture)hasgoodpropertyasabaseStudyonPropertiesofAsphaltTreatedBaseforPerpetualAsphaltPavements1LIUFu2ming,WANGDuan2Yi,SUNHong2yan(DepartmentofCivilandTransportation,SouthChinaUniversityofTechnology,Guangzhou,China510640,P.R.China;1DepartmentofCivilEngineering,NanchangInstituteofTechnology,Nanchang330099,P.R.China)[Abstract]Theresultsoflaboratoryandperformancetestsforaasphalttreatedbase(ATB)andmixesdevel2opedinthisstudyforperpetualasphaltpavements.VarioustestswerefirstconductedontheATB.Laboratorytestsforthemixesincludedmoisturesusceptibility,wheeltrackingandfatiguetests.Theresultsofperformancetestindi2catedthattheresistancesofthehighasphaltcontent(Fullasphaltmixture)ATBagainstmoistureandfatiguedam2agewerebetterthanthoseoftheconventionalACmixture.[Keywords]asphalttreatedbasehighasphaltcontentperpetualasphaltpavementperformancetests
