ACI(美国混凝土学会234委员会标准)硅粉在混凝土中应用指南

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1、ACI234R-06GuidefortheUseofSilicaFumeinConcreteReportedbyACICommittee234PerFidjestolAnthonyN.KojundicChairSecretaryJamesM.AldredTerenceC.HollandDudleyR.MorganDellaM.RoyMarkA.BuryR.DougHootonJanOlekMarcoJ.ScaliRachelJ.DetwilerTarifM.JaberH.CelikOzyildirim

2、MichaelD.A.ThomasFouadH.FouadKamalH.KhayatMichaelF.PistilliJohnT.WolsieferWilliamHalczakV.M.MalhotraJean-ClaudeRoumainMin-HongZhangThisreportdescribesthephysicalandchemicalpropertiesofsilicafume;2.4—Fineness,particleshape,andoversizematerialhowsilicafum

3、einteractswithportlandcement;theeffectsofsilicafumeon2.5—Chemicalcompositionthepropertiesoffreshandhardenedconcrete;recenttypicalapplications2.6—Crystallinityofsilica-fumeconcrete;howsilica-fumeconcreteisproportioned,specified,andhandledinthefield;andar

4、easwhereadditionalresearchisneeded.2.7—Variability2.8—Relatingphysicalandchemicalpropertiestoperfor-Keywords:curing;durability;high-rangewater-reducingadmixture;high-manceinconcretestrengthconcrete;placing;plastic-shrinkagecracking;silicafume;timeof2.9—

5、Qualitycontrolsetting;water-reducingadmixture;workability.Chapter3—MechanismsbywhichsilicafumeCONTENTSmodifiescementpaste,mortar,andconcrete,Chapter1—Introduction,p.234R-2p.234R-91.1—General3.1—General1.2—Whatissilicafume?3.2—Physicaleffects1.3—Silicafu

6、meversusotherformsofsilica3.3—Chemicaleffects1.4—Usingsilicafumeinconcrete3.4—Microstructuremodifications1.5—Usingsilicafumeinblendedcements3.5—Self-desiccationandwaterofhydration3.6—Autogenousshrinkage(volumechange)1.6—Worldwideavailabilityofsilicafume

7、3.7—Chemicalcompositionofporefluid1.7—Typesofsilicafumeproductsavailable3.8—Reactionsincombinationwithflyashorground-1.8—Healthhazardsgranulatedblast-furnaceslag1.9—Environmentalimpact3.9—Reactionswithdifferenttypesofportlandcements3.10—HeatofhydrationC

8、hapter2—Physicalpropertiesandchemical3.11—Reactionswithchemicaladmixturescompositionofsilicafume,p.234R-62.1—Color2.2—SpecificgravityChapter4—Effectsofsilicafumeonpropertiesoffreshconcrete,p.234R-172.3—Bulkdensity4.1—Waterdemand4