SBS改性沥青现场加工参数优化及性能研究

SBSSBS改性沥青现场施工为研究对象，通过对不同加工参数的填料温度、SBS改性沥青的粘度、搅拌时间和质量等关键参数进行了探SBSThispaperfocusesontheon-siteprocessingandoptimizationofdifferentparametersinSBSmodifiedasphalt,inordertoimprovetheperformanceofasphaltmixtures.Throughperformancetestingoflaboratorypreparedandon-siteinstalledasphaltmixtures,thephysicalandmechanicalpropertiesunderdifferentprocessingparameterswerestudied,andthereasonswereanalyzed.Atthesametime,thispaperdiscussesthekeyparameterssuchasfillertemperature,viscosityofSBSmodifiedasphalt,mixingtimeandqualityduringon-siteconstruction.Theresearchresultsshowthatmoderateadjustmentandoptimizationofprocessingparameterscansignificantlyimprovethephysicalandmechanicalpropertiesofasphaltmixtures,andenhancetheirwaterresistanceanddurability.SBSmodifiedasphalt,asphaltmixture,processingparameters,physicalandmechanicalpropertiesSBS(Styrene-Butadiene-Styrene)modifiedasphaltisawidelyusedasphaltmodifyingagentthatcanenhancetheperformanceoftraditionalasphaltmixtures.ThehighlevelofcompatibilitybetweenSBSandasphaltmakesSBSmodifiedasphaltapopularchoiceforpavementconstruction,especiallyfortheconstructionofhigh-endroadssuchashighways.However,theuseofSBSmodifiedasphaltalsoposeschallengestoon-siteprocessingduetoitshighviscosity,poorfluidityandlowworkability.InordertoobtainsatisfactoryperformanceofSBSmodifiedasphalt,itisnecessarytooptimizetheprocessingparametersinon-siteconstruction.Inthispaper,theon-siteprocessingandoptimizationofSBSmodifiedasphaltwasstudied,andthekeyprocessingparameterswereexploredinordertoimprovetheperformanceofasphaltmixtures.Thephysicalandmechanicalpropertiesofdifferentprocessingparametersweremeasuredtoidentifytheeffectsofdifferentparameters,andtodeterminetheoptimalprocessingparameters.MaterialsandRawTherawmaterialsusedinthisstudyareshowninTable1.Table1RawmaterialsusedinthisstudyMaterialMassfraction(%)50/70#asphalt92.5SBSmodifiedasphalt7.0Filler0.5TheequipmentusedinthisstudyMixingequipment:asphaltmixer,electricmortarLaboratoryequipment:DynamicShearRheometer(DSR),Penetrometer,MarshallStabilityTester,WaterResistanceTester;On-siteconstructionequipment:asphalttruck,paver,roller,andtemperature-controlledequipment.ExperimentalmethodsandParticlesizedistributionTheparticlesizedistributionoffillerwasmeasuredusingaLaserParticleSizeAnalyzer.Theresultsshowedthattheparticlesizedistributionofthefillerwasrelativelyuniform,withamediandiameterof72.34μm.MixingperformanceThemixingperformanceoftheasphaltmixtureswasanalyzedusingadynamicshearrheometer(DSR)andapenetrometer.Thehigh-temperatureperformanceindex(HPI)andlow-temperatureperformanceindex(LPI)werecalculatedaccordingtothetestresults,asshowninTable2.Table2HPIandLPIofdifferentSBSmodifiedasphaltmixturesProcessingparametersHPILPINo.10.79No.20.81No.30.84No.40.90TheresultsshowedthattheHPIandLPIoftheasphaltmixturesincreasedwiththeincreaseofSBScontentandmixingtemperature,indicatingthatthemixingperformanceoftheasphaltmixturewasMarshallstabilityTheMarshallstabilitytestwasperformedontheasphaltmixturesthatmetthespecificationsofthemixingperformanceanalysis.TheresultsshowedthatthestabilityoftheasphaltmixturesincreasedwiththeincreaseofSBScontentandmixingtemperature.ThemaximumstabilitywasachievedwhentheSBScontentwas7.0%andthemixingtemperaturewas160°C.WaterresistanceThewaterresistancetestwasperformedontheasphaltmixturesthatmetthespecificationsoftheMarshallstabilitytest.ThetestresultsshowedthatwiththeincreaseofSBScontentandmixingtemperature,thewaterresistanceoftheasphaltmixturesincreased,andthelossofstabilitydecreased.TheoptimalwaterresistancewasachievedwhentheSBScontentwas7.0%andthemixingtemperaturewas160°C.ThisstudyhasexploredtheoptimalprocessingparametersofSBSmodifiedasphaltinon-siteconstructionandtheeffectsofdifferentprocessingparametersonthephysicalandmechanicalpropertiesofasphaltmixtures.Theresultsshowedthatthemixingperformance,stability,andwaterresistanceoftheasphaltmixturesimprovedwiththeincreaseofSBScontentandmixingtemperature.Theoptimalprocessingparameterswere