1、Designation: C1542/C1542M 14C1542/C1542M 16Standard 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 las
2、t revision. A number 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 a core drilled from concrete.1.2 The values stated in either SI unit
3、s or inch-pound units are to be regarded separately as standard. Within the text, theinch-pound units are shown in brackets. The values stated in each system are not exact equivalents; therefore, each system shallbe used independently of the other.1.3 This standard does not purport to address all of
4、 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 Documents2.1 ASTM Standards:2C42/C42M Test Method for O
5、btaining and Testing Drilled Cores and Sawed Beams of ConcreteC125 Terminology Relating to Concrete and Concrete AggregatesC174C174/C174M Test Method for Measuring Thickness of Concrete Elements Using Drilled Concrete CoresC670 Practice for Preparing Precision and Bias Statements for Test Methods fo
6、r Construction MaterialsC1604/C1604M Test Method for Obtaining and Testing Drilled Cores of Shotcrete3. Terminology3.1 Definitions:3.1.1 For definitions of terms used in this test method, refer to Terminology C125.4. Significance and Use4.1 This test method provides two procedures for determining th
7、e length of a core as measured along its axis. obtained inaccordance with either Test Method C42/C42M or Test Method C1604/C1604M. This length is used in conjunction with lengthto diameter relationships, condition surveys, absorption, density and voids analysis, petrography, cement content analysis,
8、 andother applications. It does not meet requirements for determining the distance between two parallel surfaces, which represents thethickness of a structural element often used to establish compliance with design specifications as outlined by Test Method C174.4.2 This procedure does not intend to
9、include in the length measurement adhered particles not part of the concrete mixture.4.3 Test Method C174/C174M also determines the length of concrete cores using a different measuring apparatus andprocedure.NOTE 1Test Method C174/C174M uses an apparatus that establishes two parallel planes a known
10、distance apart. The test method measures how muchof that distance is not occupied by the core. The length of the core is determined by subtracting the measured distance from the known distance betweenthe two parallel planes.5. Apparatus5.1 Jaw Caliper, minimum depth of jaw 65 mm 2.5 in. Measuring ra
11、nge 0 to 300 mm 0 to 12 in.Accuracy to 0.030.02 mm0.001 in.in. or better.1 This test method is under the jurisdiction of ASTM Committee C09 on Concrete and Concrete Aggregates and is the direct responsibility of Subcommittee C09.61 onTesting for Strength.Current edition approved July 1, 2014Feb. 1,
12、2016. Published July 2014April 2016. Originally approved in 2002. Last previous edition approved in 20102014 asC1542/C1542M 02 (2010). 14. DOI: 10.1520/C1542_C1542M-14.10.1520/C1542_C1542M-16.2 For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM Customer Service at serv
13、iceastm.org. For Annual Book of 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.
14、Becauseit may not be technically 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.*A Summary of Changes section a
15、ppears at the end of this standardCopyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States15.1.1 Offset points as part of caliper accessory kit to permit length measurements at points not on the core perimeter.5.2 Ruler, 300 to 380 mm 12 to 15
16、 in. divided into 1 mm 116 or 0.1 in. graduations.6. Test Specimens6.1 Cores shall be obtained in accordance with Test Method C42/C42M or Test Method C1604/C1604M.6.2 Cores shall be intact and be free of any coatings.7. Procedure7.1 Jaw Caliper Procedure:7.1.1 Attach offset points to caliper jaws an
17、d initialize zero reading.7.1.2 Hold the specimen and place the open jaws of the caliper midpoint between the center and edge of the specimen. Measureand record the value to the nearest 0.25 mm 0.01 in. Rotate the specimen 90, 180, and 270 and repeat procedure. Obtain onemeasurement along the axis o
18、f the specimen and record.7.1.3 Re-zero the calipers. If the zero reading has changed by more than 0.25 mm 0.01 in. take a new set of measurementsas described in 7.1.2.7.2 Ruler Procedure:7.2.1 Position core with finished or formed face placed down against flat and level surface. Place ruler on flat
19、 surface againstside of core and measure length to nearest 1 mm 116 or 0.05 in. (Note 2) and record. Rotate core and repeat measurements atapproximately 90, 180, and 270.NOTE 2If using a ruler with 0.1 in. divisions, estimate to the nearest half division.7.2.2 If a core drilled from a pavement or st
20、ructure placed on an aggregate base course includes particles of the base coursebonded to the bottom surface of the concrete, the bonded material shall not be included in any measurements. Use the rulerprocedure when measuring cores with adhering material. Measure from the end of the core to the int
21、erface of the concrete withany adhering material. If the concrete is placed on an open-graded aggregate base course, the mortar in the concrete may penetrateinto the base and partially surround some particles. The penetrating mortar shall be measured but adhering particles shall not beincluded in an
22、y measurement.NOTE 1This procedure does not intend to include in the length measurement adhered pieces of material not part of the original concrete mixture.8. Report8.1 Jaw CaliperReport the five individual measurements to the nearest 0.25 mm 0.01 in. Average five measurements andreport to the near
23、est 1 mm 0.05 in.8.2 RulerReport the four individual measurements to the nearest 1 mm 116 or 0.05 in. Average four measurements andreport to the nearest 1 mm 0.05 in.9. Precision and Bias9.1 Precision:9.1.1 With-and between-lab Single operator and between laboratory precision of the jaw caliper and
24、ruler procedures wasestimated from the results of an interlaboratory study that included 12 laboratories, each measuring three times a core from eachof three concretes. The length of the cores ranged approximately from 64 to 117 mm 2.5 to 4.6 in. A report of the results of theinterlaboratory study i
25、s available from ASTM International Headquarters.39.1.2 Jaw Caliper ProcedureThe single-operator coefficient of variation (1S %)4 has been found to be 1.02 %, therefore, twomeasures of the same core should not differ by more than 2.89 % (D2S %)(d2S %)4 of the mean length of the core. Thebetween-labo
26、ratory coefficient of variation (1S %) has been found to be 1.60 %, therefore, two measures of the same core by twodifferent laboratories should not differ by more than 4.23 % (D2S %) of the mean length of the core.9.1.3 The between-laboratory coefficient of variation4 has been found to be 1.60 %, t
27、herefore, two measures of the same coreby two different laboratories should not differ by more than 4.23 % (d2S %)4 of the mean length of the core.9.1.4 Ruler ProcedureThe single-operator coefficient of variation (1S %)4 has been found to be 1.94 %, therefore, twomeasures of the same core should not
28、 differ by more than 5.43 % (D2S %)(d2S %)4 of the mean length of the core. Thebetween-laboratory coefficient of variation (1S %)4 has been found to be 4.35 %, therefore, two measures of the same core by twodifferent laboratories should not differ by more than 12.18 % (D2S %)(d2S %)4 of the mean len
29、gth of the core.9.2 BiasSinceBecause there are not acceptable no reference cores suitable for determining the bias of these procedures, nostatement on bias is being made.3 Supporting data have been filed at ASTM International Headquarters and may be obtained by requesting Research Report RR:C09-1024
30、. Contact ASTM CustomerService at serviceastm.org.4 As described in Practice C670.C1542/C1542M 16210. Keywords10.1 concrete; core; jaw caliper; length;ruler; rulerlength measurementSUMMARY OF CHANGESCommittee C09 has identified the location of selected changes to this standard since the last issue(C
31、1542/C1542M 02 (2010) 14 that may impact the use of this standard. (Approved Feb. 1, 2016July 1,2014.).)(1) Revised SectionsSection 45, 6, and 7. Added use of offset points on calipers(2) Added Section 6.(3) Added 7.1.3.(4) Revised Section7.2.1 1 and added Note 2Section 3(5) Added 7.2.2.(6) Revised
32、Section 9.(7) Revised Section 10.ASTM 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 determination of the validity of any such patent rights, and the riskof
33、 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 withdrawn.Your comments are invited either for revision of this st
34、andard 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 your comments have not received a fair hearing you shouldmake your
35、 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 (single or multiple copies) of this standard may be obtained by cont
36、acting 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 Copyright Clearance Center, 222Rosewood Drive, Danvers, MA 01923, Tel: (978) 646-2600; http:/ 163
