ASTM_C_469_-_C_469M_-_14.pdf

Designation:C469/C469M14Standard Test Method forStatic Modulus of Elasticity and Poissons Ratio of Concretein Compression1This standard is issued under the fixed designation C469/C469M;the number immediately following the designation indicates the yearof original adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.A superscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope*1.1 This test method covers determination of(1)chordmodulus of elasticity(Youngs)and(2)Poissons ratio ofmolded concrete cylinders and diamond-drilled concrete coreswhen under longitudinal compressive stress.Chord modulus ofelasticity and Poissons ratio are defined in Terminology E6.1.2 The values stated in either SI units or inch-pound unitsare to be regarded separately as standard.The values stated ineach system may not be exact equivalents;therefore,eachsystem shall be used independently of the other.Combiningvalues from the two systems may result in non-conformancewith 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.2.Referenced Documents2.1 ASTM Standards:2C31/C31M Practice for Making and Curing Concrete TestSpecimens in the FieldC39/C39M Test Method for Compressive Strength of Cylin-drical Concrete SpecimensC42/C42M Test Method for Obtaining and Testing DrilledCores and Sawed Beams of ConcreteC174/C174M Test Method for Measuring Thickness of Con-crete Elements Using Drilled Concrete CoresC192/C192M Practice for Making and Curing Concrete TestSpecimens in the LaboratoryC617 Practice for Capping Cylindrical Concrete SpecimensE4 Practices for Force Verification of Testing MachinesE6 Terminology Relating to Methods of Mechanical TestingE83 Practice for Verification and Classification of Exten-someter SystemsE177 Practice for Use of the Terms Precision and Bias inASTM Test Methods2.2 ASTM Adjuncts:Compressometers(two drawings)and Extensometers(twodrawings)33.Significance and Use3.1 This test method provides a stress to strain ratio valueand a ratio of lateral to longitudinal strain for hardenedconcrete at whatever age and curing conditions may bedesignated.3.2 The modulus of elasticity and Poissons ratio values,applicable within the customary working stress range(0 to40%of ultimate concrete strength),are used in sizing ofreinforced and nonreinforced structural members,establishingthe quantity of reinforcement,and computing stress for ob-served strains.3.3 The modulus of elasticity values obtained will usuallybe less than moduli derived under rapid load application(dynamic or seismic rates,for example),and will usually begreater than values under slow load application or extendedload duration,given other test conditions being the same.4.Apparatus4.1 Testing MachineUse a testing machine capable ofimposing a load at the rate and of the magnitude prescribed in6.4.The machine shall conform to the requirements of Prac-tices E4(Constant-Rate of-Traverse CRT-Type Testing Ma-chines section).The spherical head and bearing blocks shallconform to the Apparatus Section of Test Method C39/C39M.4.2 Compressometer3For determining the modulus ofelasticity use a bonded(Note 1)or unbonded sensing devicethat measures to the nearest 5 millionths the average deforma-tion of two diametrically opposite gauge lines,each parallel tothe axis,and each centered about midheight of the specimen.1This 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 March 1,2014.Published April 2014.Originallyapproved in 1961.Last previous edition approved in 2010 as C46910.DOI:10.1520/C0469_C0469M-14.2For 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 ASTM International Headquarters.Order Adjunct No.ADJC0469.*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 States1 The effective length of each gauge line shall be not less thanthree times the maximum size of the aggregate in the concretenor more than two thirds the height of the specimen;thepreferred length of the gauge line is one half the height of thespecimen.Either use gauge points embedded in or cemented tothe specimen,and read deformation of the two lines indepen-dently;or use a compressometer(such as is shown in Fig.1)consisting of two yokes,one of which(see B,Fig.1)is rigidlyattached to the specimen and the other(see C,Fi