1、Designation: C1542/C1542M 16C1542/C1542M 16aStandard 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 la
2、st 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 uni
3、ts 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 o
4、f 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
5、Obtaining and Testing Drilled Cores and Sawed Beams of ConcreteC125 Terminology Relating to Concrete and Concrete AggregatesC174/C174M Test Method for Measuring Thickness of Concrete Elements Using Drilled Concrete CoresC670 Practice for Preparing Precision and Bias Statements for Test Methods for C
6、onstruction 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 the l
7、ength of a core obtained in accordance with either TestMethod C42/C42M or Test Method C1604/C1604M. This length is used in conjunction with condition surveys, density and voidsanalysis, and other applications.4.2 This procedure does not intend to include in the length measurement adhered particles n
8、ot 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 distance apart. The test method measures how muchof t
9、hat distance is not occupied by the core. The length of the core is determined by subtracting the measured distance from the calculation using theknown distance between the two parallel planes.planes and the measured distance from the upper plane to the top of the core.5. Apparatus5.1 Jaw Caliper, m
10、inimum depth of jaw 65 mm 2.5 in. Measuring range 0 to 300 mm 0 to 12 in. Accuracy to 0.02 mm0.001 in. or better.5.1.1 Offset points as part of caliper accessory kit to permit length measurements at points not on the core perimeter.1 This test method is under the jurisdiction of ASTM Committee C09 o
11、n Concrete and Concrete Aggregates and is the direct responsibility of Subcommittee C09.61 onTesting for Strength.Current edition approved Feb. 1, 2016June 1, 2016. Published April 2016June 2016. Originally approved in 2002. Last previous edition approved in 20142016 asC1542/C1542M 14.16. DOI: 10.15
12、20/C1542_C1542M-16.10.1520/C1542_C1542M-16A.2 For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM Customer Service at serviceastm.org. For Annual Book of ASTM Standardsvolume information, refer to the standards Document Summary page on the ASTM website.This document is
13、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 technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropri
14、ate. 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 appears at the end of this standardCopyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States1
15、5.2 Ruler, 300 to 380 mm 12 to 15 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
16、 offset points to caliper jaws and 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. Obtai
17、n onemeasurement along the axis of 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 l
18、evel surface. Place ruler on flat 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 c
19、ore drilled from a pavement or structure 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 fr
20、om the end of the core to the interface 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 par
21、ticles shall not beincluded in any measurement.8. Report8.1 Jaw CaliperReport the five individual measurements to the nearest 0.25 mm 0.01 in. Average five measurements andreport to the nearest 1 mm 0.05 in.8.2 RulerReport the four individual measurements to the nearest 1 mm 116 or 0.05 in. Average
22、four measurements andreport to the nearest 1 mm 0.05 in.9. Precision and Bias9.1 Precision:9.1.1 Single operator and between laboratory precision of the jaw caliper and ruler procedures was estimated from the resultsof an interlaboratory study that included 12 laboratories, each measuring three time
23、s a core from each of three concretes.The lengthof the cores ranged approximately from 64 to 117 mm 2.5 to 4.6 in.Areport of the results of the interlaboratory study is availablefrom ASTM International Headquarters.39.1.2 Jaw Caliper ProcedureThe single-operator coefficient of variation4 has been fo
24、und to be 1.02 %, therefore, twomeasures of the same core should not differ by more than 2.89 % (d2S %)4 of the mean length of the core.9.1.3 The between-laboratory coefficient of variation4 has been found to be 1.60 %, therefore, two measures of the same coreby two different laboratories should not
25、 differ by more than 4.23 % (d2S %)4 of the mean length of the core.9.1.4 Ruler ProcedureThe single-operator coefficient of variation4 has been found to be 1.94 %, therefore, two measures ofthe same core should not differ by more than 5.43 % (d2S %)4 of the mean length of the core. The between-labor
26、atory coefficientof variation4 has been found to be 4.35 %, therefore, two measures of the same core by two different laboratories should not differby more than 12.18 % (d2S %)4 of the mean length of the core.9.2 BiasBecause there are no reference cores suitable for determining the bias of these pro
27、cedures, no statement on bias isbeing made.10. Keywords10.1 concrete; core; jaw caliper; ruler; length measurement3 Supporting data have been filed at ASTM International Headquarters and may be obtained by requesting Research Report RR:C09-1024. Contact ASTM CustomerService at serviceastm.org.4 As d
28、escribed in Practice C670.C1542/C1542M 16a2SUMMARY OF CHANGESCommittee C09 has identified the location of selected changes to this standard since the last issue(C1542/C1542M 16) that may impact the use of this standard. (Approved June 1, 2016.)(1) Rewrote Note 1.SUMMARY OF CHANGESCommittee C09 has i
29、dentified the location of selected changes to this standard since the last issue(C1542/C1542M 1414) that may impact the use of this standard. (Approved Feb. 1, 2016.)(1) Revised Section 4.(2) Added Section 6.(3) Added 7.1.3.(4) Revised 7.2.1 and added Note 2.(5) Added 7.2.2.(6) Revised Section 9.(7)
30、 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 infringement
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