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沥青路面早期病害及处置措施（Earlydiseaseanddisposalmeasuresofasphaltpavement）----------------------------------------------------------------------------------------------------------------------------------------------------Withtheincreaseofroadtrafficcapacity,theincreaseofautomobileaxleloadandimprovementofdrivingspeedonhigh-gradehighway,accordingtothetraditionalasphaltstandardroadsappearedserioustheearlydamagephenomenaoftheearlydamageofasphaltpavementcommonphenomenon:flushing,waves,package,cracksandpotholes,loose,etc.Basedonthis,theauthorputsforwardsomemeasurestopreventandcontrolthemeasures.I.causesofearlydamagetotheroadsurface(1)design(1)theactualsituationofdesignandroadsectionisdifferent,andthedesignstructureisnotreasonable.Theasphaltpavementstructureisnotsuitable,themixturetypeisnotreasonable,theasphaltmixtureisnotaccurate.(2)theroadpavementdesignthicknessofstrengthobviouslycannotmeettherequirementofthetraffic,transportationdevelopingrapidly,theroadrebounddeflectionvalueincreasesgradually,can'tsatisfythetrafficdemandrapidgrowthandmotorloadareincreased,theprematurefatiguedamageofasphaltpavement,roadnetcrackwithlongitudinalcrackanddeformation.(3)routedesignwithoutcarefulconsiderationofroadsurfacedrainagesystem,theroadatthebottomoftheconcavecurveshouldbedesignedintheculvert,andjetgrooveissetontheslope,ultra-highavoidincuttingarea,inprincipletoconsiderdeependitches.(2)constructionofsubgrade(1)thereisalargeamountofwaterinthesubgrade,whichcausescracksintheroadsurfaceundertheactionoffrostheave.(2)thesubgraderollerisnotuniform,andthepartialuncompactionofthefillingsoilorthecompactionofbothsidesisnotenough,whichcausesthesubgradetosinkintodifferentdegreesandformcracks.(3)whentheoldroadiswidened,theconnectionoftheoldandnewroadbedcannotmeettherequirementsofthetechnicalspecifications.Thenewsubgradecompactionisnotenough,resultinginunevensubsidenceorlandslideoftheroadbed,andtheformationofcracks.(4)theconstructionoftheroadbedintheabutmentandthefillingareaofthebridgeisnotrequiredaccordingtothespecification,anditiseasytocausenaturalsettlement,anditiseasytoformcracksthroughlongdriving.(iii)maintenancemanagement(1)maintenanceisnottimely.Theasphaltpavementundertheactionofasmallareaofloose,individualpit,nottimelymaintenance.Earlymaintenanceismoreimportant.(2)impropermaintenancemethods,somemaintenancepersonnelonbituminousconcretepavementadoptartificialoilspraying,artificialsprayingmethodsformaintenance.(4)basicconstruction(1)atpresent,thehighgradehighwaypavementstructureisbasicallythestructureofthesemi-rigidbaselayer,therearealotoftroublewithsuchstructure,semi-rigidbaseiseasycraze,thereflectiontothesurface,surfacewater,anditisdifficulttodischarge,easytocausetheroadboundaryconditionandstresschanges.(2)cleaningofgrassroots,baseandsurfacesurfaces.Beforepavingastructurelayer,ifthepavementstructurelayerandaggradation,floatingash,floatingonthesurfaceoftheroadbedsandremovalisnotclean,undertheeffectofrainwater,thefloatingoilcausedbythedrivingextrusionissoftlayerofhighpressurewaterscouringintopulp,andspreadtothesurfaceofasphaltroadsurface.(3)becauseofthepoorconstructionquality,theinorganicbindingmaterialstabilizesthebaseorbottomlayerwithoutmixingandthebottomlayerisnotmixed,andthebottomlayerofsoiliswellkept,whichcausestheroadsurfacetocrackundertherepeatedactionofthedriving.(4)secondarysupplementarylayercausedbylooseandloosecoefficientcontrol.(5)intheprocessofgrass-rootsconstruction,cracksarefoundintheupperandlowertransversejointsofthestablesoilduetooverlaporlap.(6)thebottomlevelcompactionisnotsufficient,andinthecaseofthemaximumdrydensity,thelevelofcompactionofthebaseiscloselyrelatedtotheproportionofcoarseandfineaggregateinthemixture,especiallythecontentofcoarseaggregate.(5)roadconstruction(1)compositionofasphaltmixture.Mineralaggregategradation,asphaltcontent,aggregatespeciesdonotconformtotherequirementsofthedesignspecification,inspectionforrawmaterialsislax,themixtureratiocontroloftheasphaltmixtureisnotenough,especiallythedosageofmineralpowderandasphalt,theasphaltpavementearlypush,wrapped,loose,sexuallyexplicit,pitslot,cracks,etc.(2)whentheporosityoftheasphaltsurfaceislarger,thepermeabilityoftheasphaltsurfaceincreases,andtheexternalwateriseasytopenetrateintothestructure.(3)constructionprocessandproceduresarenotcarriedoutinaccordancewiththeconstructionprocess,andpartialwaterseepagecanbecausedbysegregationandunevendistributionofpartialroadsurface.(4)insufficientcompactioninconstruction,andcannotbecompactedintimewhenthetemperatureishigh,notusingahigh-tonnagetyreroller.(5)theconstructionmachineryequipmentisoldandunmatched,whichmakesthemixmixratiomeasurement,mixinguniformity,compactnessdegree,flatnessandsoon.(6)asphaltmixtureheatingtemperatureistoohigh,asphaltandmineralmixturesaremixed,andthebitumenisscorchedbythehightemperatureoftheore,whichcausestheasphalttoageandthepavementstrengthisinsufficient,resultinginloose,pitandotherdiseases.2.Environmentalimpact(1)agingandenvironmentalfactorsIntheharshwinter,theasphaltmaterialisthemostfragile,itsstrengthwillb