1、Designation:C99/C99M15Standard Test Method forModulus of Rupture of Dimension Stone1This standard is issued under the fixed designation C99/C99M;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 pa
2、rentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This test method covers the determination of the modu-lus of rupture of all types of dimension stone except slate.1.2 The values stated in either SI un
3、its 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 p
4、urport 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:2C119
5、 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 inmodulus of rupture bet
6、ween the various dimension stones.Thistest method also provides one element in comparing stones ofthe same type.5.Apparatus5.1 Testing MachineThe accuracy of the testing machineshall be within 1%for the range from 10 to 1000 lbf 50 to5000 N.5.2 Load Application and Support BlocksThe supports forthe
7、specimen shall be of the rocker type(Fig.1)with edges atleast as long as the width of the specimen.The load applicationblock may be of either the rocker or rigid type.The portions ofthe load application and support blocks contacting the stoneshall be rounded,with a nominal radius of12in.13 mm.6.Samp
8、ling6.1 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 th
9、e 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 modulus ofrupture.NOTE1Refer to Guide C1799 for additional informa
10、tion on selecting,preparing,and conditioning test specimens.7.Test Specimens7.1 The specimens shall be 4 by 8 by 214in.100 by 200 by60 mm in size and fabricated to tolerances of 6116in.62mm.They shall be sawed from the sample and finished bygrinding to smooth surfaces.The 4 by 8-in.100 by 200-mmface
11、s shall be as nearly plane and parallel as practicable.Forloading perpendicular to the rift(Note 2)five specimens shallbe prepared with the 4 by 8-in.100 by 200-mm faces parallelto the rift planes(see Fig.1),and for loading parallel to the rift,five specimens shall be prepared with the 4 by 214-in.1
12、00 by60-mm faces parallel to the rift(Note 3).When tests aredesired on the stone in both the wet and dry condition,tenspecimens shall be prepared for each direction of loading;thatis,five for tests dry,perpendicular to the rift,five for tests wet,perpendicular to the rift,etc.NOTE2The term rift is u
13、sed here to designate the direction in whichthe stone splits most easily.In stratified stones it is considered to coincidewith the bedding or stratification.The rift direction should always bemarked on the sample by the quarryman,since it often is not possible todetermine it on a small block.NOTE3An
14、other condition of loading may occur in structures whenthe rift planes are vertical and parallel to the length of the beam.Thestrength of the stone may be obtained for such loading by cutting thespecimens with the 214by 8-in.60 by 200-mm face parallel to the rift.1This test method is under the juris
15、diction 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 1931.Last previous edition approved in 2009 as C9909.DOI:10.1520/C0099_C0099M-15.2For referenced ASTM s
16、tandards,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 The meager data available for this condition of loading indicates that thestrength is at least as high as when the load is applied perpendicular to therift as shown in Fig.1.8.Ma
