PerformanceInvestigationofLabandPlantFoamedRecycledAsphaltPavementMixtures.pdf
Theproducingprocessofasphaltmixtureinanasphaltplantgenerallyaveragelyemitsover20tonsofemissioneachyearinUnitedStates.Therefore,itisverynecessarytoreducetheemissionsfromasphaltplants.Thefoamingprocessgenerallyproducestinysteambubblesinsidetheasphaltbinder,leadingtoincreasedwettabilityofthebinderandlowerhighshearviscosities,andthussignificantlyreducestheemission.Inaddition,therecyclingofexistingasphaltpavementmaterialsproducesnewpavementswithconsiderablesavingsinmaterial,money,andenergy,provingtobebotheconomicalandeffectiveinprotectingtheenvironment.Theobjectiveofthisstudyistoexploretheperformancecharacteristicsoflaboratoryandplantfoamedmixturescontainingacertaincontentofrecycledasphaltpavement(RAP).TheusedmaterialswereapprovedbySouthCarolinaDepartmentofTransportation(SCDOT).Inthisstudy,sixRAPconcentrations(0#,20#,and30#fromlaband10#,15#and25#fromplant)fromfoursourceswereemployed.Somerheologicaltestsincludingviscosityandperformancegradevaluesofasphaltbindersatvirginandrollingthinfilmovenagedstatesaswellasextractedstatewereperformed.Inaddition,performancetestssuchascompactioneffort,indirecttensilestrength,ruttingresistance,resilientmodulus,andfatiguewerecompletedtoinvestigatetheinfluenceoffoamingtechnologyandRAPconcentrationonlaboratoryandasphaltplant.Thetestresultsillustratedthat,asexpected,ahigherRAPcontentresultedinahigherviscosityandachievedhighermixingandcompactiontemperatures.Additionally,ahigherfailuretemperatureandalowerphaseanglecouldbefoundwhenusedagreaterpercentageofRAP.Themixdesignresultsindicatedthatlaboratoryfoamedmixturehadaloweroptimumasphaltbindercontentcomparedtoplantmixdesign(withoutfoamingtechnology).However,theplantfoamedmixtureshadrelativelyhigherITSandfatiguevalues,lowerrutdepthsandresilientmodulusvaluesingeneral;mostwereRAPsourcedependent.Moreover,itwasfoundthatthefoamingtechnologywasworkingverywelltoproducethemixturesinthelabandplant,whichsatisfiedtherequirementsofallmixtypessetbySCDOT.
作者：FeipengXiao SerjiN.Amirkhanian LijunSun
作者单位：KeyLaboratoryofRoadandTrafficEngineeringoftheMinistryofEducation,TongjiUniversity,Shanghai,ChinaDepartmentofCivil,Construction,andEnvironmentalEngineering,UniversityofAlabama,Tuscaloosa,AL,USA
母体文献：第七届中国公路科技创新高层论坛论文集
会议名称：第七届中国公路科技创新高层论坛
会议时间：2015年4月22日
会议地点：上海
主办单位：中国公路学会
语种：chi
分类号：
关键词：Foaming RAP MixDesign ITS Rutting Fatigue
在线出版日期：2018年8月28日
基金项目：
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