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1、ThemiddlerouteofthesouthtoNorthWaterTransfetProjectisanimportsntinfrastructureprojecttooptimizetheallocationofwaterresourcesandsolvethewatershortageinthenorthofChina.Itplaysastrategicroleinrealizingthesustainabledevelopmentofthenorthernregion・Theprojectis1273.4km,Chinaisfollowi
2、ngtheYangtzeRiverThreeGorgesProjectafteranotherlargewaterconservancyproject,projectoflargescale,complexgeologicalconditions,thestructureofbuildingcomplex,thenewpumpingstations,channels,largeaqueduct,invertedsiphonconcretebuildingengineeringmorethan1000.Thehugevolumeofconcrete,c
3、oncretetechnicalrequirementsfordifferentkindsofbuildings,concretestrengthgrade,fromCIOtoC60thelowestlayerofconcrete,prestressedconcretePCCPpipelineproject,fromnormalconcretetothepump,selfcompactingconcrete,thesetechnicalrequirementsneeddifferenttypesandvarietiesofadditives,inor
4、dertomeettheneedsofdesignandconstructionthe・Therefore,howtoselectandapplytheadmixturereasonably,improvethedurabilityofconcreteandguaranteetheconstruct!onqualityoftheprojectwilldirectlyaffectthesafeoperationandservicelifeofthemiddlerouteproject・Thispaperbrieflyintroducestheappli
5、cationofpolycarboxylatesuperplasticizerinthePCCPprojectofthemiddlerouteofSouthtoNorthWaterDiversionProject,andprovidesreferenceandreferenceforsimilarprojects・PCCPpipelineengineering1.projectbriefintroduction:theBeijingsectionoftheMiddleRouteProjectofthesouthtoNorthWaterTransfer
6、Projecthasatotallengthof80.4km,ofwhichthetotallengthofthePCCPprojectis56.359km,andthedoublerowDN4000prestressedsteelcylinderconcretepipe(PCCP)isusedforcarryingwater・Themaximumworkingpressureofthepipelinedesignis0.8MPa,themaximumdesignsoildepthis10m,andthecoreconcretestrengthdes
7、igngradeisC50toC60,whichbelongstohighstrengthandhighperformanceconcrete,andthetotalconcreteamountisabout420thousandm3.PCCP(PrestressedConcreteCylinderPipe)istheabbreviationofEnglishprestressedconcretecylinderpipe,isinthecoreofprestressedsteelwirewindingsteeldrumconcretepipe,wat
8、erpipeandspraytheprotectivelayerofcementmortarmade・Iti
