ASTM_C_1604_-_C_1604M_-_05_2012.pdf

Designation:C1604/C1604M05(Reapproved 2012)Standard Test Method forObtaining and Testing Drilled Cores of Shotcrete1This standard is issued under the fixed designation C1604/C1604M;the number immediately following the designation indicates theyear of original adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of lastreapproval.A superscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This test method covers obtaining,preparing,and test-ing cores drilled from shotcrete for length,compressivestrength,or splitting tensile strength determinations.1.2 The values stated in either inch-pound units or SI unitsshall be regarded separately as standard.SI units are shown inbrackets.The values stated in each system may not be exactequivalents;therefore,each system must be used indepen-dently of the other.Combining values from the two systemsmay result in nonconformance with the standard.1.3 The text of this standard references notes and footnotesthat provide explanatory material.These notes and footnotes(excluding those in tables and figures)shall not be consideredas requirements of the standard.1.4 This standard does not purport to address the safetyconcerns,if any,associated with its use.It is the responsibilityof the user of this standard to establish appropriate safety andhealth practices and determine the applicability of regulatorylimitations prior to use.2.Referenced Documents2.1 ASTM Standards:2C39/C39M Test Method for Compressive Strength of Cylin-drical Concrete SpecimensC42/C42M Test Method for Obtaining and Testing DrilledCores and Sawed Beams of ConcreteC125 Terminology Relating to Concrete and Concrete Ag-gregatesC174/C174M Test Method for Measuring Thickness of Con-crete Elements Using Drilled Concrete CoresC496/C496M Test Method for Splitting Tensile Strength ofCylindrical Concrete SpecimensC617 Practice for Capping Cylindrical Concrete SpecimensC670 Practice for Preparing Precision and Bias Statementsfor Test Methods for Construction MaterialsC823 Practice for Examination and Sampling of HardenedConcrete in ConstructionsC1140 Practice for Preparing and Testing Specimens fromShotcrete Test PanelsC1231/C1231M Practice for Use of Unbonded Caps inDetermination of Compressive Strength of Hardened Con-crete Cylinders2.2 ACI Standards:3318 Building Code Requirements for Structural Concrete506.2 Specification for Shotcreting506.4R Guide for the Evaluation of Shotcrete3.Terminology3.1 For definitions of terms used in this standard,refer toTerminology C125.4.Significance and Use4.1 This test method provides standardized procedures forobtaining cored specimens to determine the compressivestrength and splitting tensile strength of shotcrete duringpre-construction,during construction,and from older shotcretestructures.4.2 Generally,test specimens are obtained in situ whendoubt exists about the in-place shotcrete quality due either tolow strength test results during construction or signs of distressin the structure.Other uses of this method are to providespecimens for acceptance testing,construction control and toassess the condition,quality and uniformity of the shotcrete inaccordance with Practice C823(see Note 1).4.3 Specimens obtained by this method are used to verifythe thickness of shotcrete and aid in the visual assessment ofthe shotcrete quality,workmanship,defects,shotcrete-to-substrate bond and the condition of any reinforcement used inthe shotcrete.41This test method is under the jurisdiction of ASTM Committee C09 onConcrete and Concrete Aggregates and is the direct responsibility of SubcommitteeC09.46 on Shotcrete.Current edition approved April 1,2012.Published November 2012.Originallyapproved in 2005.Last previous edition approved in 2005 as C1604/C1604M05.DOI:10.1520/C1604_C1604M-05R12.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.3Available from American Concrete Institute(ACI),P.O.Box 9094,FarmingtonHills,MI 48333-9094,http:/www.concrete.org.4Bartlett,F.M.,and MacGregor,J.G.,“Effect of Core Diameter on ConcreteCore Strengths,”ACI Materials Journal,Vol 91,No.5,SeptemberOctober 1994,pp.460470.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 4.4 Shotcrete strength is affected by the location of theshotcrete in a structure.Vertical,sub-horizontal and overheadelements of the shotcrete structure may show variability.Corestrength is affected by core orientation relative to direction ofshotcrete application.These factors shall be considered inplanning the locations for obtaining shotcrete samples and ininterpreting strength test results.4.5 Shotcrete is applied in single or multiple layers,as plainshotcrete,reinforced shotcrete,or fiber-reinforced shotcrete.Core sampl