1、Designation: C1542/C1542M 02 (Reapproved 2010)Standard Test Method forMeasuring Length of Concrete Cores1This standard is issued under the fixed designation C1542/C1542M; the number immediately following the designation indicates theyear of original adoption or, in the case of revision, the year of
2、last revision. A number in parentheses indicates the year of lastreapproval. A superscript epsilon () indicates an editorial change since the last revision or reapproval.1. Scope1.1 This test method covers the determination of the lengthof a core drilled from a concrete structure when the reason iso
3、ther than measuring dimensional tolerances of concrete ele-ments.1.2 The values stated in either SI units or inch-pound unitsare to be regarded separately as standard. Within the text, theinch-pound units are shown in brackets. The values stated ineach system are not exact equivalents; therefore, ea
4、ch systemshall be used independently of the other.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 r
5、egulatory limitations prior to use.2. Referenced Documents2.1 ASTM Standards:2C42/C42M Test Method for Obtaining and Testing DrilledCores and Sawed Beams of ConcreteC174 Test Method for Measuring Thickness of ConcreteElements Using Drilled Concrete CoresC670 Practice for Preparing Precision and Bias
6、 Statementsfor Test Methods for Construction Materials3. Significance and Use3.1 This test method provides two procedures for determin-ing the length of a core as measured along its axis. This lengthis used in conjunction with length to diameter relationships,condition surveys, absorption, density a
7、nd voids analysis,petrography, cement content analysis, and other applications. Itdoes not meet requirements for determining the distancebetween two parallel surfaces, which represents the thicknessof a structural element often used to establish compliance withdesign specifications as outlined by Te
8、st Method C174.4. Apparatus4.1 Jaw Caliper, depth of jaw 65 mm 2.5 in. Measuringrange 0 to 300 mm 0 to 12 in. Accuracy to 0.03 mm 0.001in.4.2 Ruler, 300 to 380 mm 12 to 15 in. divided into 1 mm116 or 0.1 in. graduations.5. Procedure5.1 Jaw Caliper Procedure:5.1.1 Hold the specimen and place the open
9、 jaws of thecaliper midpoint between the center and edge of the specimen.Measure and record the value to the nearest 0.25 mm 0.01 in.Rotate the specimen 90, 180, and 270 and repeat procedure.Obtain one measurement across the center of the specimen andrecord.5.2 Ruler Procedure:5.2.1 Position core wi
10、th finished or formed face placeddown against flat and level surface. Place ruler on flat surfaceagainst side of core and measure length to nearest 1 mm 116 or0.1 in. and record. Rotate core and repeat measurements atapproximately 90, 180, and 270.NOTE 1This procedure does not intend to include in t
11、he lengthmeasurement adhered pieces of material not part of the original concretemixture.6. Report6.1 Jaw CaliperAverage five measurements and report tonearest 1 mm 0.1 in.6.2 RulerAverage four measurements and report to near-est 1 mm 0.1 in.7. Precision and Bias7.1 Precision:7.1.1 With-and between-
12、lab precision of the jaw caliper andruler procedures was estimated from the results of an inter-laboratory study that included 12 laboratories, each measuringthree times a core from each of three concretes. The length of1This test method is under the jurisdiction of ASTM Committee C09 onConcrete and
13、 Concrete Aggregates and is the direct responsibility of SubcommitteeC09.69 on Miscellaneous Tests.Current edition approved Dec. 1, 2010. Published March 2011. Originallyapproved in 2002. Last previous edition approved in 2002 as C1542/C1542M02.DOI: 10.1520/C1542_C1542M-02R11.2For referenced ASTM st
14、andards, 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.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken
15、, PA 19428-2959, United States.the cores ranged approximately from 64 to 117 mm 2.5 to 4.6in. A report of the results of the interlaboratory study isavailable from ASTM International Headquarters.37.1.2 Jaw Caliper ProcedureThe single-operator coeffi-cient of variation (1S %)4has been found to be 1.
16、02 %,therefore, two measures of the same core should not differ bymore than 2.89 % (D2S %)4of the mean length of the core.The between-laboratory coefficient of variation (1S %)4hasbeen found to be 1.60 %, therefore, two measures of the samecore by two different laboratories should not differ by more
17、than 4.23 % (D2S %)4of the mean length of the core.7.1.3 Ruler ProcedureThe single-operator coefficient ofvariation (1S %)4has been found to be 1.94 %, therefore, twomeasures of the same core should not differ by more than5.43 % (D2S %)4of the mean length of the core. The between-laboratory coeffici
18、ent of variation (1S %)4has been found to be4.35 %, therefore, two measures of the same core by twodifferent laboratories should not differ by more than 12.18 %(D2S %)4of the mean length of the core.7.2 BiasSince there are not acceptable reference coressuitable for determining the bias of these proc
19、edures, nostatement on bias is being made.8. Keywords8.1 concrete; core; jaw caliper; length; rulerASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin this standard. Users of this standard are expressly advised that deter
20、mination of the validity of any such patent rights, and the riskof infringement of such rights, are entirely their own responsibility.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
21、withdrawn. Your comments are invited either for revision of this standard or for additional standardsand should be addressed to ASTM International Headquarters. Your comments will receive careful consideration at a meeting of theresponsible technical committee, which you may attend. If you feel that
22、 your comments have not received a fair hearing you shouldmake your views known to the ASTM Committee on Standards, at the address shown below.This standard is copyrighted by ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959,United States. Individual reprints (
23、single or multiple copies) of this standard may be obtained by contacting ASTM at the aboveaddress or at 610-832-9585 (phone), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org). Permission rights to photocopy the standard may also be secured from the ASTM website (www.astm.org/COPYRIGHT/).3Supporting data have been filed at ASTM International Headquarters and maybe obtained by requesting Research Report RR:C09-1024.4As described in Practice C670.C1542/C1542M 02 (2010)2
