1、Designation: C99/C99M 09C99/C99M 15Standard 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 revisio
2、n. A number in parentheses 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 modulus of rupture of all types of dimension stone except slate.1.2 UnitsThe valu
3、es stated in either SI units or inch-pound units are to be regarded separately as standard. The values statedin each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining valuesfrom the two systems may result in non-conformance with the stand
4、ard.1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibilityof the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatorylimitations prior to use.2. Referenced
5、 Documents2.1 ASTM Standards:2C119 Terminology Relating to Dimension StoneC1799 Guide to Dimension Stone Test Specimen Sampling and Preparation3. Terminology3.1 DefinitionsAll definitions are in accordance with Terminology C119.4. Significance and Use4.1 This test method is useful in indicating the
6、differences in modulus of rupture between the various dimension stones. Thistest method also provides one element in comparing stones of the same type.5. Apparatus5.1 Testing MachineThe accuracy of the testing machine shall be within 1 % for the range from 10 to 1000 lbf 50 to 5000N.5.2 Load Applica
7、tion and Support BlocksThe supports for the specimen shall be of the rocker type (Fig. 1) with edges at leastas long as the width of the specimen. The load application block may be of either the rocker or rigid type. The portions of the loadapplication and support blocks contacting the stone shall b
8、e rounded, with a nominal radius of 12 in. 13 mm.6. Sampling6.1 Select the sample to represent a true average of the type or grade of stone under consideration and of the quality suppliedto the market under the type designation to be tested. The sample may be selected by the purchaser or his authori
9、zed representativefrom the quarried stone or taken from the natural ledge and shall be of adequate size to permit the preparation of the desired numberof test specimens. When perceptible variations occur, the purchaser may select as many samples as are necessary for determiningthe variations in modu
10、lus of rupture.NOTE 1Refer to Guide C1799 for additional information on selecting, preparing, and conditioning test specimens.7. Test Specimens7.1 The specimens shall be 4 by 8 by 214 in. 100 by 200 by 60 mm in size and fabricated to tolerances of 6116 in. 62 mm.They shall be sawed from the sample a
11、nd finished by grinding to smooth surfaces. The 4 by 8-in. 100 by 200-mm faces shall1 This test method is under the jurisdiction of ASTM Committee C18 on Dimension Stone and is the direct responsibility of Subcommittee C18.01 on Test Methods.Current edition approved April 1, 2009May 1, 2015. Publish
12、ed April 2009July 2015. Originally approved in 1931. Last previous edition approved in 20082009 asC9908.09. DOI: 10.1520/C0099_C0099M-09.10.1520/C0099_C0099M-15.2 For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM Customer Service at serviceastm.org. For Annual Book of
13、 ASTM Standardsvolume information, refer to the standards Document Summary page on the ASTM website.This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Becauseit may not be technicall
14、y possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current versionof the standard as published by ASTM is to be considered the official document.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C7
15、00, West Conshohocken, PA 19428-2959. United States1be as nearly plane and parallel as practicable. For loading perpendicular to the rift (Note 12) five specimens shall be prepared withthe 4 by 8-in. 100 by 200-mm faces parallel to the rift planes (see Fig. 1), and for loading parallel to the rift,
16、five specimens shallbe prepared with the 4 by 214-in. 100 by 60-mm faces parallel to the rift (Note 23). When tests are desired on the stone in boththe wet and dry condition, ten specimens shall be prepared for each direction of loading; that is, five for tests dry, perpendicularto the rift, five fo
17、r tests wet, perpendicular to the rift, etc.NOTE 2The term rift is used here to designate the direction in which the stone splits most easily. In stratified stones it is considered to coincide withthe bedding or stratification. The rift direction should always be marked on the sample by the quarryma
18、n, since it often is not possible to determine iton a small block.NOTE 3Another condition of loading may occur in structures when the rift planes are vertical and parallel to the length of the beam. The strengthof the stone may be obtained for such loading by cutting the specimens with the 214 by 8-
19、in. 60 by 200-mm face parallel to the rift. The meager dataavailable for this condition of loading indicates that the strength is at least as high as when the load is applied perpendicular to the rift as shown in Fig.1.SI Unit Equivalents214 in. 60 mm312 in. 90 mm4 in. 100 mm8 in. 200 mmFIG. 1 Speci
20、mens and Preferred Type of Load Application and Support Blocks for Determining the Modulus of Rupture of BuildingStoneC99/C99M 1528. Marking and Measuring Specimens8.1 On the 4 by 8-in. 100 by 200-mm face draw the center line perpendicular to one edge (8 by 214-in. 60 by 200-mm face)and extend down
21、both edges perpendicular to the 4 by 8-in. 100 by 200-mm face. At a distance of 312 in. 90 mm each wayfrom the center line, draw two similar sets of lines (span lines in Fig. 1). Mark each specimen to indicate the direction of the riftand label with suitable numbers or letters for identification in
22、measuring and testing.8.2 Measure the dimensions of the cross section on the center line. Measure the width to the nearest 0.01 in. 0.1 mm and takethe thickness as the average of three measurements to the nearest 0.01 in. 0.1 mm, one taken at the center and one near each edge.9. Conditioning9.1 Befo
23、re testing the specimens in a dry condition, dry them for 48 h at 140 6 4F 60 6 2C. At the 46th, 47th and 48thhour, weigh the specimens to ensure that the weight is the same. If the weight continues to drop, continue to dry the specimensuntil there are three successive hourly readings with the same
24、weight. After removing the specimens from the oven, cool them toroom temperature in a desiccator before testing them.9.2 Before testing the specimens in a wet condition, immerse them in water for 48 h at 72 6 4F 22 6 2C. Test themimmediately upon removal from the bath, wiping the specimens free of s
25、urface water.10. Procedure10.1 Lay the specimen flatwise on the support blocks, spaced 7 in. 180 mm apart and equidistant from the load applicationblock (Note 34), with all three load application and support blocks parallel. When a load of 10 lbf 50 N has been applied, stopthe loading and make all l
26、oad application and support blocks coincide with the marks on the specimen by centering the specimenunder the load application block and moving the support blocks under the span marks. Apply the loading at a rate not exceeding1000 lbf/min 5000 N/min until failure of the specimen.NOTE 4When all three
27、 load application and support blocks are of the rocker type, care must be taken to adjust all three until the top face of thespecimen is horizontal when loaded.11. Calculation11.1 Calculate the modulus of rupture of each specimen as follows:R 53Wl/2bd2 (1)where:R = modulus of rupture, psi MPa,W = br
28、eaking load, lbf N,l = length of span, in. mm,b = width of specimen, in. mm, andd = thickness of specimen, in. mm.12. Report12.1 Report the average of all values of modulus of rupture for test specimens loaded perpendicular to the rift as the modulusof rupture perpendicular to the rift, and report t
29、he average for all test specimens loaded parallel to the rift as the modulus of ruptureparallel to the rift. In case any specimen gives a value of as much as 20 % under the average it shall be examined for defects and,if the low value appears to be due to a flaw or faulty test piece, report the aver
30、age of the remaining specimens of the group as themodulus of rupture of the sample for the condition of loading under consideration. Report all determinations as information.12.2 Report the following additional information:12.2.1 Identification of the sample, including the name and location of the q
31、uarry, name and position of the ledge, date whensample was taken, and trade name or grade of the stone,12.2.2 Size and shape of specimens used in the test, and12.2.3 A description of the way in which the specimens were prepared.13. Precision and Bias13.1 Individual variations in a natural product ma
32、y result in deviation from accepted values. A precision section will be addedwhen sufficient data are available to indicate acceptable tolerances in repeatability and reproducibility.C99/C99M 15314. Keywords14.1 dimension stone; flexure; modulus of rupture; stone; testASTM International takes no pos
33、ition respecting the validity of any patent rights asserted in connection with any item mentionedin this standard. Users of this standard are expressly advised that determination of the validity of any such patent rights, and the riskof infringement of such rights, are entirely their own responsibil
34、ity.This standard is subject to revision at any time by the responsible technical committee and must be reviewed every five years andif not revised, either reapproved or withdrawn.Your comments are invited either for revision of this standard or for additional standardsand should be addressed to AST
35、M International Headquarters. Your comments will receive careful consideration at a meeting of theresponsible technical committee, which you may attend. If you feel that your comments have not received a fair hearing you shouldmake your views known to the ASTM Committee on Standards, at the address
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