ASTM_C_880_-_C_880M_-_15.pdf

Designation:C880/C880M15Standard Test Method forFlexural Strength of Dimension Stone1This standard is issued under the fixed designation C880/C880M;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.Scope1.1 This test method covers the procedure for determiningthe flexural strength of stone by use of a simple beam usingquarter-point loading.1.2 Stone tests shall be made when pertinent for the situa-tion when the load is perpendicular to the bedding plane andwhen the load is parallel to the bedding plane.1.3 As required,the flexural tests shall also be conductedunder wet conditions.1.4 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.1.5 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:2E4 Practices for Force Verification of Testing MachinesC119 Terminology Relating to Dimension StoneC1799 Guide to Dimension Stone Test Specimen Samplingand Preparation3.Terminology3.1 DefinitionsAll definitions are in accordance with Ter-minology C119.4.Significance and Use4.1 This test method is useful in indicating the differences inflexural strength between the various dimension stones.Thistest method also provides one element in comparing stones ofthe same type.5.Apparatus5.1 Testing Machine(Fig.1),conforming to the require-ments of the applicable sections of Practices E4.The quarter-point loading method shall be used in making flexure tests ofstone employing bearing blocks which will ensure that forcesapplied to the beam will be vertical only and applied withouteccentricity.The apparatus should be capable of maintainingthe span length and distances between load-applying blocksand support blocks constant within 60.05 in.61 mm.Theload should be capable of being applied at a uniform rate andin such a manner as to avoid shock.6.Sampling6.1 Select the sample to represent a true average of the typeor grade of stone under consideration and of the qualitysupplied to the market under the type designation to be tested.The sample may be selected by the purchaser or his authorizedrepresentative from the quarried stone or taken from the naturalledge and shall be of adequate size to permit the preparation ofthe desired number of test specimens.When perceptiblevariations occur,the purchaser may select as many samples asare necessary for determining the variations in flexuralstrength.NOTE1Refer to Guide C1799 for additional information on selecting,preparing,and conditioning test specimens.7.Test Specimen7.1 The test specimens shall measure 4 in.100 mm wideby 1.25 in.30 mm thick by 15 in.350 mm long,with a spanas tested of 12.5 in.300 mm.The sides of the specimen shallbe at right angles with the top and bottom.The specimens shallhave a fine abrasive finish on the planes perpendicular to theload and a fine saw finish on the other four planes.Thedimensions of the specimen shall be measured and recorded tothe nearest 0.01 in.0.1 mm.A minimum of five specimensshall be tested for each condition of test.The average value ofthe test results is reported as the flexural strength of the stone.1This test method is under the jurisdiction of ASTM Committee C18 onDimension Stone and is the direct responsibility of Subcommittee C18.01 on TestMethods.Current edition approved May 1,2015.Published July 2015.Originally approvedin 1978.Last previous edition approved in 2009 as C88009.DOI:10.1520/C0880_C0880M-15.2For 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.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 7.2 Where this test method is specified in the physicalrequirements of an ASTM C18 Standard Specification for adimension stone,the test specimens shall meet the require-ments under 7.1.7.3 Where the job thickness has been set(for example,thethickness of the stone panels for the project has beenestablished),it is often requested to perform flexure tests at thejob thickness.The following shall govern the specimen sizewhere it is requested to test at the job thickness and the jobthickness is other than 1.25 in.30 mm.The span as testedshall be 10 times the thi