ACI 304.2R-1996 PLACING CONCRETE BY PUMPING METHODS

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1、ACI304.2R-96PlacingConcretebyPumpingMethodsReportedbyACICommittee304NeilR.Guptill,ChairmanDavidJ.AkersRobertA.Kelsey*JamesS.PierceCasimirBognacki*JohnC.KingPaulE.Reinhart†JamesL.CopeWilliamC.KrellRoyceJ.Rhoads*MichaelGardnerGaryR.MassKennethL.SaucierDanielJ.Green*Pat

2、rickMcDowellPaulR.StodolaTerenceC.HollandDipakT.ParekhWilliamX.Sypher*ThomasA.Johnson*RogerJ.Phares*RobertE.Tobin*SamuelA.KalatKevinWolf*Memberofsubcommitteethatpreparedthisreport.†Chairmanofsubcommitteethatpreparedthisreport.Thisreportdescribespumpsfortransportingan

3、dplacingconcrete.Rigid2.3—Trailerpumpsandflexiblepipelinesarediscussedandcouplingsandotheraccessories2.4—Truck-mountedconcretepumpsdescribed.Recommendationsforproportioningpumpableconcretesuggest2.5—Placingboomsoptimumgradationofaggregates;outlinewater,cement,andadmi

4、xture2.6—Specializedequipmentrequirements;andemphasizetheneedforevaluationoftrialmixesforpumpability.Theimportanceofsaturatinglightweightaggregatesis2.7—Safetystressed.Suggestionsaregivenforlayoutoflines;formaintaininguniformdeliveryrate,aswellasuniformqualityofconcr

5、eteattheendoftheline;Chapter3—Pipelineandaccessories,p.304.2R-5andforcleaningoutpipelines.3.1—GeneraldescriptionThisreportdoesnotcovershotcretingorpumpingofnonstructuralinsu-3.2—Systempressurecapacitylatingorcellularconcrete.3.3—Rigidplacingline—Straightsections,bend

6、s,andelbowsKeywords:admixtures;aggregategradation;aggregates;cementcontent;3.4—Systemconnectioncoarseaggregates;concreteconstruction;concretes;conveying;couplings;fineaggregates;finenessmodulus;lightweightaggregateconcrete;light-3.5—Flexiblesystem—Hosetypesandapplica

7、tionsweightaggregates;mixproportioning;pipeline;placing;placingboom;3.6—Concreteplacingsystemaccessoriespozzolans;pumpedconcrete;pumps;qualitycontrol;watercontent.Chapter4—Proportioningpumpableconcrete,p.CONTENTS304.2R-104.1—BasicconsiderationsChapter1—Introduction,p

8、.304.2R-24.2—Normalweightaggregate4.3—LightweightaggregateconcreteChapter2—Pumpingequipment,p.304.2R-24.4—Waterandslump2.1—Pistonpu