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1、RESEARCHONTHEPROPERTIESOFROADBUILDINGMATERIALSTREATEDWITHFOAMEDBITUMENINCHINA12Z.HeandW.Lu1ShanghaiPudongRoadandBridgeConstructionCo.Ltd.2TongjiUniversity.1.INTRODUCTIONstAsweenterthe21century,manyofChina’sroadsgointostagesofmaintenanceandrehabilitation;twelveperce
2、ntofitsroadsneedheavyrepair,producingaround2.2milliontonsofasphaltpavementwaste.Thequestionarisesashowtorecyclethesewastedmaterialsandmakefulluseoftheminnewpavementconstructionandrehabilitationworks.Themosteffectivewaytoprotecttheenvironmentandsavecosts,especiallyi
3、nthewestofChina,isbecominganurgenttaskforroadengineers.Thispaperhastwoobjectives.ThefirstistoreportonthefoamingcharacteristicsofaselectionofbitumentypescommonlyusedinroadconstructioninChina.Foamingcharacteristicsaredescribedintermsof“expansionratio”and“half-life”.T
4、hesecondistoevaluatethephysicalperformanceofoneoftheseofthesetypesofbitumen,asabinderinbotharecycledbituminouspavingmixtureandanewgravelmixture.2.FOAMINGCHARACTERISTICSOFBITUMEN“Expansionratio”and“halflife”havebecomefairlywellknowntermsforcharacterizingfoamedbitume
5、n.Inthisresearchfourtypesofbitumen,KoreaAH-70,ShellAH-70,ZhenhaiAH-70,andEssoAH-70werecharacterizedusingWirtgenWLB10foamedbitumentestingequipment.TheTable1showspenetration,softeningpoint,ductilityandwaxcontentofthefourbitumentypes.Table1.Propertiesofthefourtypesofb
6、itumenintest.PenetrationSofteningDuctibilityWaxpoint(oC)ocontent(%)(0.1mm)(15C)KoreaAH-706948.5>200cm1.9ShellAH-706847.3>200cm1.8Zhenhai7748.0>200cm2.6AH-70EssoAH-708546.0>200cm1.9oTestingforfoamcharacteristicswasperformedat25Cwithoutsignificantvariationsinambientt
7、emperatureorhumidity.Thefoamcharacteristicswereinvestigatedwithbitumentemperatures,oooorespectively,of140C,150C,160Cand170C.Thequantityofwateraddedtoproducethefoamwasalsovariedateachofthesetemperatures,withtestsbeingcarriedoutusing1%,2%,3%,4%and5%bymassofwater.Expa
8、nsionratioandhalf-lifewereestablishedinthiswayforeachofthefourtypesofbitumen.thProceedingsofthe8ConferenceonAsphaltPavementsforSouthernAfrica(CAP
