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1、....KarumaHydropowerPlantandAssociatedTransmissionLineWorksManualForConcreteDefectsRepairingOfTRTLiningRef:M-GE-GE-005(Revision0)THEEMPLOYER:THEEPCCONTRACTOR:THEGOVERNMENTOFREPUBLICOFUGANDA,SINOHYDROCORPORATIONLIMITEDREPRESENTEDBYTHEMINISTRYOFENERGYAND
2、MINERALDEVELOPEMENTOctober,2016...CONTENT1.Purpose12.MainDefectsofConcreteWorks13.MajorTechinicalMeasuresForRepairing13.1Dislocation13.2GroutLeakage23.3HoneyComb23.4PittedSurface23.5Cavity23.6LocalDepressionandGroove33.7ReinforcementExposure33.8Crackan
3、dColdjoint43.9ProtrudedReinforcementEnd54.QualityControl5...1.PurposeToinsureconcretequalityshallmeetstandardandcontractrequirementsafterconcreterepairingprocedures.2.MainDefectsofConcreteWorksCommondefectsmaybeoccurinconcreteworksmainlyincludedislocat
4、ion,groutleakage,honeycomb,pittedsurface,cavity,localdepressionandgroove,reinforcementexposure,coldjoint,cracks,protrudedreinforcementendandsoon.3.MajorTechinicalMeasuresForRepairingOncethetypeofthedefectisidentified,relativespecial-assignedpersonnelwi
5、llbearrangedtotreatthevariousdefectsoccurindifferentconstructionpositions.3.1DislocationRepairmethodsfordislocationmainlyincludechiselingandpolishing,thenbackfilledwithequivelentstrenthastheconcrete.Differentmethodswillbeadoptedaccordingtodifferentsitu
6、ation.1)Ifthedislocationisnotmorethan20mm,grindingmachineshallbeusedforpolishingthesurfacetoformaslopeof1:10.2)Ifthedislocationismorethan20mm,pneumaticpickshallbeusedtotrimthesurfacetoformaslopeof1:10.3)Ifonlyappearancerequirement,fineaggregateconcrete
7、ormortarwhichisonegradehigherthantheoriginalconcreteshallbeusedforcompactingandlevelingthesurface....1.1GroutLeakageTheleakedgroutshallbecleanedaway.Ifinsomepositions,it’shardtoremovethegroutingartificially.Insuchportions,grindingmachinewillbeusedforpo
8、lishingandtrimingthesurfaceandthenusehighpressurewatertoflushthesurface.1.2HoneyCombTochipawaytheloosematerialinthehoneycombartificiallyorbypneumaticpick,andthenusehighpressurewaterflushthesurface.Fineconcreteormortar,onegradehigherthan
