ACI 228.1R-95 In-Place Methods to Estimate Concrete Strength

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1、ACI228.1R-95In-PlaceMethodstoEstimateConcreteStrengthReportedbyACICommittee228NicholasJ.Carino*MaryJ.SansaloneChairmanSecretaryFarhadAnsariF.DirkHeidbrinkRobertW.RossJohnA.Bickley†KalR.HindoThomasJ.RoweHermenegildoCaratinRobertoHuykeBryceP.SimonsKiHoChoiRobertS.Jenkins†PatrickJ.S

2、ullivanGerardoG.ClemeñaAlexanderM.LeshchinskyBruceA.SuprenantNeilA.CummingH.S.LewMichaelA.TaylorAllenG.DavisKennethM.LozenGeorgeV.TeodoruRonaldL.DillyV.M.MalhotraHenryT.Thornton,Jr.DonaldE.DixonLarryD.OlsonWoodwardL.VogtBorisDragunskySandorPopovicsAlexanderB.ZoobRichardD.GaynorPa

3、ulH.Read*TaskforceChairman.†Memberoftaskforcethatpreparedrevision.Guidanceisprovidedontheuseofmethodstoestimatethein-placeChapter2—Reviewofmethods,p.228.1R-3strengthofconcreteinnewandexistingconstruction.Themethodsinclude:2.1—Introductionreboundhammer,penetrationresistance,pullou

4、t,break-off,ultrasonic2.2—Reboundnumber(ASTMC805)pulsevelocity,maturity,andcast-in-placecylinders.Theprinciple,inher-entlimitations,andrepeatabilityofeachmethodarereviewed.Procedures2.3—Penetrationresistance(ASTMC803)arepresentedfordevelopingtherelationshipneededtoestimatecompres

5、-2.4—Pullouttest(ASTMC900)sivestrengthfromin-placeresults.Factorstoconsiderinplanningin-place2.5—Break-offtest(ASTMC1150)testsarediscussed,andstatisticaltechniquestointerprettestresultsare2.6—Ultrasonicpulsevelocity(ASTMC597)presented.Theuseofin-placetestsforacceptanceofconcretei

6、sintro-2.7—Maturitymethod(ASTMC1074)duced.Theappendixprovidesinformationonthenumberofstrengthlevelsthatshouldbeusedtodevelopthestrengthrelationshipandexplainsa2.8—Cast-in-placecylinders(ASTMC873)regressionanalysisprocedurethataccountsforerrorintheindependent2.9—Combinedmethodsvar

7、iable.2.10—SummaryKeywords:coefficientofvariation;compressivestrength;concretes;Chapter3—Statisticalcharacteristicsoftests,p.228.1R-construction;nondestructivetests;reviews;safety;sampling;statistical12analysis3.1—Needforstatisticalanalysis3.2—RepeatabilityoftestresultsCONTENTSCh

8、apter4—Developmentofstrengthrelationship