1、Designation: C 1542/C 1542M 02Standard Test Method forMeasuring Length of Concrete Cores1This standard is issued under the fixed designation C 1542/C 1542M; the number immediately following the designation indicates theyear of original adoption or, in the case of revision, the year of last revision.
2、 A number in parentheses indicates the year of lastreapproval. A superscript epsilon (e) 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 isother than mea
3、suring 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, each systemshal
4、l 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 regulatory lim
5、itations prior to use.2. Referenced Documents2.1 ASTM Standards:C 42/C 42M Test Method for Obtaining and Testing DrilledCores and Sawed Beams of Concrete2C 174 Test Method for Measuring Thickness of ConcreteElements Using Drilled Concrete Cores2C 670 Practice for Preparing Precision and Bias Stateme
6、ntsfor Test Methods for Construction Materials23. 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 and void
7、s 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 Test Meth
8、od C 174.4. 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 jaws
9、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 with fin
10、ished 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 the len
11、gthmeasurement 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-lab pr
12、ecision 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 ofthe cores ranged approximately from 64 to 117 mm 2.5 to 4.6in. A report of the results
13、 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 1.02 %,therefore, two measures of the same core should not differ by1This test method is under the jurisdiction of ASTM
14、 Committee C09 onConcrete and Concrete Aggregates and is the direct responsibility of SubcommitteeC09.69 on Miscellaneous Tests.Current edition approved Aug. 10, 2002. Published October 2002.2Annual Book of ASTM Standards, Vol 04.02.3Supporting data have been filed at ASTM International Headquarters
15、 and maybe obtained by requesting Research Report RR: C09-1024.4As described in Practice C 670.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.more than 2.89 % (D2S %)4of the mean length of the core.The between-laboratory coefficient
16、 of variation (1S %)4hasbeen found to be 1.60 %, therefore, two measures of the samecore by two different laboratories should not differ by morethan 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 %, ther
17、efore, twomeasures of the same core should not differ by more than5.43 % (D2S %)4of the mean length of the core. The between-laboratory 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、18 %(D2S %)4of the mean length of the core.7.2 BiasSince there are not acceptable reference coressuitable for determining the bias of these procedures, nostatement on bias is being made.8. Keywords8.1 concrete; core; jaw caliper; length; rulerASTM International takes no position respecting the valid
19、ity 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 responsibility.This standard is subje
20、ct 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 ASTM International Headquart
21、ers. 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 shown below.This standard
22、 is copyrighted by ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959,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).C 1542/C 1542M 022
