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1、沥青论文之针入度指数AsphaltBindersandAsphaltMixturesCoursePaperPenetrationIndexofasphaltbindersName:StudentNumber:Class:2015-01-08Abstract:Atfirst,abriefreviewaboutpenetrationindex(PI)isgiven.PenetrationIndex(PI)valueregressedbasedonthepenetrationresultswithdifferenttemperatureaccordingtoChines
2、espec讦ication.ItisfoundthatthePIvalueissensitivetothepenetrationerror,tothedeterminingnumberoftemperature-penetrationforPI,tothetemperaturescopeforPI.AndthePlvalueisaffectedbymanyfaetersratherthanasphaltitself.Keywords:asphalt;temperaturesusceptibility;penetrationindex;Influencefactor
3、THEORIGINOFPIIn1889,Browendesignedthepenetrationtestmethod.Itissimpleandfast,soithasbeenuseduntilnow.In1936,Pfeifferproposedthelinearrelationshipbetweenthelogarithmofneedlepenetrationandthecorrespondingtemperature.Itcanbemeasuredby2differenttemperaturestoobtainthepenetrationpenetratio
4、nindexPI.PfeifferandVandoormaalalsofoundthatwhentestingsofteningpointtemperaturethoughEPRuK‘mostasphaltpenetrationisabout800(0.1mm),SoPfeifferandVandoormaalusedthepenetrationofsofteningpointtemperature800(0.1)insteadofcomputingPI;becauseofthepenetrationof25degreescentigradewasaregular
5、index,generallytakingpenetrationof25°Casanothertemperaturepenetration’infact,throughthepenetrationandsofteningpointof25°CcandirectlyworkoutP-thecurrentinternationaloftenusethismethodtocomputeP.PENETRATIONTESTMETHODPenetrationisawaytoexpresstheconsistencyofasphalt,reflectingtheasphaltr
6、heologicalproperties.ThedeterminationmethodcarriesonaccordingtoGB/T45091998?expressedinthedepthwiththestandardneedleinacertainload,temperature,timeverticallypenetratingtheasphaltspecimen.Unlessotherwisestated,thetotalweightofstandardneedle,needleconnectingrodandadditionalbalancingweig
7、htis(100+0.05)g,temperatureis(25+0.1)C,timeis5s.InGB/T45091998,theconditionsofspecimenpreparationisstipulated:gentlycoverthesampledish,coolingforl.O^lhin15・30Catroomtemperature(asmalltestsampledish)or1.5-2h(alargespecimendish),thenputtwosampledishesandflatglassdishtogetherinaconstantt
8、emper
