1、Designation: C1542/C1542M 14Standard 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 last revision. A n
2、umber in parentheses indicates the year of lastreapproval. A superscript epsilon () indicates an editorial change since the last revision or reapproval.1. Scope*1.1 This test method is used to determine the length of acore drilled from concrete.1.2 The values stated in either SI units or inch-pound
3、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, each systemshall be used independently of the other.1.3 This standard does not purport to address all of thesafety concern
4、s, 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:2C42/C42M Test Method for Obtaining and Tes
5、ting DrilledCores and Sawed Beams of ConcreteC125 Terminology Relating to Concrete and Concrete Ag-gregatesC174 Test Method for Measuring Thickness of ConcreteElements Using Drilled Concrete CoresC670 Practice for Preparing Precision and Bias Statementsfor Test Methods for Construction Materials3. T
6、erminology3.1 Definitions:3.1.1 For definitions of terms used in this test method, referto Terminology C125.4. Significance and Use4.1 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
7、relationships,condition surveys, absorption, density and 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
8、compliance withdesign specifications as outlined by Test Method C174.5. Apparatus5.1 Jaw Caliper, minimum depth of jaw 65 mm 2.5 in.Measuring range 0 to 300 mm 0 to 12 in. Accuracy to 0.03mm 0.001 in.5.1.1 Offset points as part of caliper accessory kit to permitlength measurements at points not on t
9、he core perimeter.5.2 Ruler, 300 to 380 mm 12 to 15 in. divided into 1 mm116 or 0.1 in. graduations.6. Procedure6.1 Jaw Caliper Procedure:6.1.1 Attach offset points to caliper jaws and initialize zeroreading.6.1.2 Hold the specimen and place the open jaws of thecaliper midpoint between the center an
10、d 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 along the axis of the specimen andrecord.6.2 Ruler Procedure:6.2.1 Position core with finished or formed face placeddown against flat an
11、d level surface. Place ruler on flat surfaceagainst side of core and measure length to nearest 1 mm 116 or0.05 in. and record. Rotate core and repeat measurements atapproximately 90, 180, and 270.NOTE 1This procedure does not intend to include in the lengthmeasurement adhered pieces of material not
12、part of the original concretemixture.7. Report7.1 Jaw CaliperAverage five measurements and report tonearest 1 mm 0.05 in.7.2 RulerAverage four measurements and report to near-est 1 mm 0.05 in.1This test method is under the jurisdiction of ASTM Committee C09 onConcrete and Concrete Aggregates and is
13、the direct responsibility of SubcommitteeC09.69 on Miscellaneous Tests.Current edition approved July 1, 2014. Published July 2014. Originally approvedin 2002. Last previous edition approved in 2010 as C1542/C1542M 02 (2010).DOI: 10.1520/C1542_C1542M-14.2For referenced ASTM standards, visit the ASTM
14、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.*A Summary of Changes section appears at the end of this standardCopyright ASTM International, 100 Barr Harb
15、or Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States18. Precision and Bias8.1 Precision:8.1.1 With-and between-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
16、 core from each of three concretes. The length ofthe 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.38.1.2 Jaw Caliper ProcedureThe single-operator coeffi-cient of variation (1S %)4has b
17、een found to be 1.02 %,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
18、not differ by morethan 4.23 % (D2S %)4of the mean length of the core.8.1.3 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-l
19、aboratory coefficient 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.8.2 BiasSince there are not acceptable reference coressuitable for determining the
20、bias of these procedures, nostatement on bias is being made.9. Keywords9.1 concrete; core; jaw caliper; length; rulerSUMMARY OF CHANGESCommittee C09 has identified the location of selected changes to this standard since the last issue(C1542/C1542M 02 (2010) that may impact the use of this standard.
21、Approved July 1, 2014.)(1) Revised Sections 4, 5, and 6. Added use of offset points oncalipers.(2) Revised Section 1 and added Section 3.ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin this standard. Users of this st
22、andard are expressly advised that determination 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 a
23、ndif not revised, either reapproved or 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,
24、 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 shown below.This standard is copyrighted by ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-29
25、59,United States. Individual reprints (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 standar
26、d may also be secured from the Copyright Clearance Center, 222Rosewood Drive, Danvers, MA 01923, Tel: (978) 646-2600; http:/ data have been filed at ASTM International Headquarters and maybe obtained by requesting Research Report RR:C09-1024. ContactASTM CustomerService at serviceastm.org.4As described in Practice C670.C1542/C1542M 142
