ASTM_C_39_-_C_39M_-_17b.pdf

Designation:C39/C39M17bStandard Test Method forCompressive Strength of Cylindrical Concrete Specimens1This standard is issued under the fixed designation C39/C39M;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.This standard has been approved for use by agencies of the U.S.Department of Defense.1.Scope*1.1 This test method covers determination of compressivestrength of cylindrical concrete specimens such as moldedcylinders and drilled cores.It is limited to concrete having adensity in excess of 800 kg/m350 lb/ft3.1.2 The values stated in either SI units or inch-pound unitsare to be regarded separately as standard.The inch-pound unitsare shown in brackets.The values stated in each system maynot be exact equivalents;therefore,each system shall be usedindependently of the other.Combining values from the twosystems may result in non-conformance with the standard.1.3 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.(WarningMeansshould be provided to contain concrete fragments duringsudden rupture of specimens.Tendency for sudden ruptureincreases with increasing concrete strength and it is more likelywhen the testing machine is relatively flexible.The safetyprecautions given in the Manual are recommended.)1.4 The text of this standard references notes which provideexplanatory material.These notes shall not be considered asrequirements of the standard.1.5 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:2C31/C31M Practice for Making and Curing Concrete TestSpecimens in the FieldC42/C42M Test Method for Obtaining and Testing DrilledCores and Sawed Beams of ConcreteC125 Terminology Relating to Concrete and Concrete Ag-gregatesC192/C192M Practice for Making and Curing Concrete TestSpecimens in the LaboratoryC617/C617M Practice for Capping Cylindrical ConcreteSpecimensC670 Practice for Preparing Precision and Bias Statementsfor Test Methods for Construction MaterialsC873/C873M Test Method for Compressive Strength ofConcrete Cylinders Cast in Place in Cylindrical MoldsC1077 Practice for Agencies Testing Concrete and ConcreteAggregates for Use in Construction and Criteria forTesting Agency EvaluationC1176/C1176M Practice for Making Roller-CompactedConcrete in Cylinder Molds Using a Vibrating TableC1231/C1231M Practice for Use of Unbonded Caps inDetermination of Compressive Strength of Hardened Cy-lindrical Concrete SpecimensC1435/C1435M Practice for Molding Roller-CompactedConcrete in Cylinder Molds Using a Vibrating HammerC1604/C1604M Test Method for Obtaining and TestingDrilled Cores of ShotcreteE4 Practices for Force Verification of Testing MachinesE18 Test Methods for Rockwell Hardness of Metallic Ma-terialsE74 Practice of Calibration of Force-Measuring Instrumentsfor Verifying the Force Indication of Testing MachinesManual of Aggregate and Concrete Testing1This test method is under the jurisdiction of ASTM Committee C09 onConcrete and Concrete Aggregates and is the direct responsibility of SubcommitteeC09.61 on Testing for Strength.Current edition approved Aug.1,2017.Published August 2017.Originallyapproved in 1921.Last previous edition approved in 2017 as C39/C39M 17a.DOI:10.1520/C0039_C0039M-17B.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.*A Summary of Changes section appears at the end of this standardCopyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade(TBT)Committee.1 3.Terminology3.1 DefinitionsFor definitions of terms used in thispractice,refer to Terminology C125.3.2 Definitions of Terms Specific to This Standard:3.2.1 bearing block,nsteel piece to distribute the loadfrom the testing machine to the specimen.3.2.2 lower bearing block,nsteel piece placed under thespecimen to distribute the load from the testi