1、Designation: C 1245/C 1245M 06Standard Test Method forDetermining Bond Strength Between Hardened RollerCompacted Concrete and Other Hardened CementitiousMixtures (Point Load Test)1This standard is issued under the fixed designation C 1245/C 1245M; the number immediately following the designation ind
2、icates theyear of original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of lastreapproval. A superscript epsilon (e) indicates an editorial change since the last revision or reapproval.1. Scope*1.1 This test method is intended for testin
3、g roller-compactedconcrete specimens and covers determination of the relativebond between layers of roller-compacted concrete or otherhardened concrete in multiple-lift forms of construction. It isapplicable to all types of layered concrete where the total depthis sufficient to meet the minimum spec
4、imen length and diam-eter requirements of this test method. This test method is notintended to provide tensile strength results of the materialtested.1.2 The values stated in SI units, shown in brackets, orinch-pound units are to be regarded separately as standard. Thevalues stated in each system ma
5、y not be exact equivalents;therefore, each system shall be used independently of the other,without combining values in any way. Combining values fromthe two systems may result in non-conformance with thestandard.1.3 This standard does not purport to address all of thesafety concerns, if any, associa
6、ted 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:2C 39/C 39M Test Method for Compressive Strength of Cy-lindri
7、cal Concrete SpecimensC 42/C 42M Test Method for Obtaining and Testing DrilledCores and Sawed Beams of ConcreteC 125 Terminology Relating to Concrete and ConcreteAggregatesC 192/C 192M Practice for Making and Curing ConcreteTest Specimens in the LaboratoryC 670 Practice for Preparing Precision and B
8、ias Statementsfor Test Methods for Construction MaterialsC 1176 Practice for Making Roller-Compacted Concrete inCylinder Molds Using a Vibrating TableC 1435/C 1435M Practice for Molding Roller-CompactedConcrete in Cylinder Molds Using a Vibrating HammerD 1557 Test Methods for Laboratory Compaction C
9、harac-teristics of Soil Using Modified Effort (56,000 ft-lbf/ft3(2,700 kN-m/m3)3. Terminology3.1 Refer to Terminology C 125 for definitions of termsused in this test method.4. Significance and Use4.1 This test method is used to measure the effectiveness ofbonding roller-compacted concrete to other r
10、oller-compactedconcrete or other hardened cementitious mixtures by using apoint load test at the joint. Bond strength is determined usingdrilled cores or cast cylindrical specimens in which the bondsurface is essentially normal to the longitudinal axis at approxi-mately the mid-length of the specime
11、n.Asplitting tensile stressnormal to the bond surface is produced by applying a pointload at the joint.4.2 This test method may be used either for laboratoryinvestigation by casting individual composite cylinders or bycoring prototype structures or assemblies (Test Method C 42/C 42M).5. Apparatus5.1
12、 Testing MachineThe testing machine shall conform tothe requirements of Test Method C 39/C 39M.5.2 Testing ApparatusThe testing apparatus shall be con-structed of steel and allow the testing of both 4 and 6-in. 100and 150-mm diameter specimens. The test schematic is givenin Fig. 1. The testing appar
13、atus shall permit the positioning ofa specimen such that the joint of the bonded surfaces isoriented as closely as possible parallel to the direction ofloading. Figs. 2-9 provide the information necessary to con-struct the apparatus for 4 and 6-in. 100 and 150-mm diameterspecimens. Anvil rods (Fig.
14、3 and Fig. 5) shall have a hardness1This test method is under the jurisdiction of ASTM Committee C09 onConcrete and Concrete Aggregates and is the direct responsibility of SubcommitteeC09.45 on Roller Compacted Concrete.Current edition approved July 1, 2006. Published August 2006. Originallyapproved
15、 in 1993. Last previous edition approved in 2003 as C 1245/C 1245M 03.2For referenced ASTM standards, 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
16、 website.1*A Summary of Changes section appears at the end of this standard.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.of not less than 55 HRC (Rockwell hardness number of 55 onthe C scale) and shall be plane on the bearing surfa
17、ces to within60.001 in. 0.025 mm. The alignment post shall ensure thatthe anvil rods are kept parallel to each other in the verticalplane. The system is easily adaptable to most testing machines.6. Test Specimens6.1 Test specimens shall be cores or cast cylinders 4 or 6 60.25 in. 100 or 150 6 5 mm i
18、n diameter. Cast cylinders inaccordance with Practice C 1176, Practice C 1435, or TestMethod D 1557. Cut each core and cast each cylinder to ensurethat the plane best describing the bond surface is oriented at 906 15 to the long axes of the specimens.6.2 Cure molded test specimens in accordance with
19、 PracticeC 192/C 192M (laboratory specimens). Drilled cores shall bemoisture conditioned in accordance with Test Method C 42/C 42M.NOTE 1Test results are not affected significantly by specimen surfacesobtained with normal coring operations. The ends of cores need not betrimmed.NOTE 2Where the bond s
20、urface undulates grossly, that is, the surfacehas a local texture exceeding 0.5 in. 13 mm in amplitude, 6-in. 150-mmdiameter cores are preferable. No information is available on the relativeresults of 6-in. 150-mm versus 4-in. 100-mm diameter specimens.7. Procedure7.1 MeasurementsDetermine the diame
21、ter of the testspecimens by averaging three diameters measured on the bondsurface. Visually identify the bond surface by color, texture, ormaterial contrasts. Measure diameters to the nearest 0.01 in.0.25 mm with calipers, whenever possible, but at least to thenearest 0.1 in. 2.5 mm. Determine the l
22、ength of each sectionof the bonded specimens to the nearest 0.1 in. 2.5 mm, anduse these lengths to determine the section length-to-diameterratios. Specimens must have a minimum length-to-diameterratio of 1.2 if the bond plane is at mid-length (within 60.25 in.6 mm) of the specimen. If the bond plan
23、e is not at mid-lengthFIG. 1 Schematic of Loading MethodC 1245/C 1245M 062of the specimen, the section on each side of the bond planeshall be of a length at least 0.6 the diameter. Where the bondsurface is irregular or undulating, mark on the specimen a linerepresenting a plane extending through and
24、 along the approxi-mate average bearing of the bond surface, and measure thelength from this line.NOTE 3Many drilled cores will not be smooth enough to justify themeasurement of diameters closer than to the nearest 0.1 in. 2.5 mm.7.2 PositioningAssemble and position the apparatus inthe testing machi
25、ne. Place the specimen on the bottom platewith the joint in contact with the anvil rods (see Fig. 1). Thelonger anvil rods (Fig. 3a and Fig. 5a) and the longer alignmentpost (Fig. 9) are used to test 6-in. 150-mm diameter speci-mens. The shorter anvil rods (Fig. 3b and Fig. 5b) and theshorter alignm
26、ent post (Fig. 8) are used to test 4-in. 100-mmdiameter specimens.7.2.1 Zero the load-indicating mechanism. Position thespecimen so that the bond surface is parallel to the upper andlower anvil rods (see Fig. 1). This is best accomplished bypositioning the specimen by hand while gently bringing the
27、topanvil into contact with the specimen. Alternatively, the speci-men may be supported with modeling clay or pieces ofpolystyrene. Where the bond surface is irregular or undulating,align the anvil rods along the approximate average bearing ofthe bond surface. Bring the anvil rods in contact with the
28、 bondsurface at the contact point on the circumference of thespecimen.FIG. 2 Base Platea. Rod for 6-in. 150-mm Diameter Specimensb. Rod for 4-in. 100-mm Diameter SpecimensFIG. 3 Bottom Anvil RodsFIG. 4 Top PlateC 1245/C 1245M 0637.3 LoadingDo not preload the specimen. Apply the loadat a uniform rate
29、 within the range of 150 to 200 psi/min 1 to1.4 MPa/min until the specimen fails. Record the maximumload applied.8. Calculation8.1 Calculate the strength of the bond as follows:ftb5PD2where:ftb= bond strength, psi MPa,P = maximum applied load, lbf N, andD = average specimen diameter at bond surface,
30、 in. mm.9. Report9.1 Report the following information:9.1.1 Date of testing.9.1.2 Specimen identification and if cored, the location ofthe core.9.1.3 Details of the materials comprising the specimens,such as the following:9.1.3.1 Mixture proportions of the concretes and mortars;9.1.3.2 Details of fa
31、brication including the practice or testmethod used to cast or mold cylinders;9.1.3.3 Details of bonding techniques;9.1.3.4 Age, when tested;9.1.3.5 Specimen size including diameter and length of eachlayer material and whether a cast cylinder or drilled core wasused; and9.1.3.6 Any other information
32、 necessary to describe theproduction or features of the specimens.9.1.4 Record of curing and moisture condition of the speci-mens at the time of test.9.1.5 Any special treatment or prior testing performed onthe specimens.9.1.6 Strength of the bond to the nearest 10 psi 0.1 MPa.9.1.7 Mode of failure:
33、9.1.7.1 Whether bond failure or aggregate failure, or both,were observed in the plane of failure;9.1.7.2 Should the fracture occur along the original bondsurface, the nature of the surface such as texture (smooth orrough), appearance (glossy or dull, undulating or flat), anddetailed descriptions of
34、discoloration, foreign objects or mate-rials, loose or dusty material in voids, and the suspectedpresence and condition, or absence, of any bonding improve-ment agent;9.1.7.3 Alternatively, should the plane of fracture occurpartially or totally within the concrete layers adjacent to thebond surface,
35、 the percentage of the total area subjected to thistype of failure versus the percentage area where failureoccurred at the bond surface; and9.1.7.4 Any unexpected features.a. Rod for 6-in. 150-mm Diameter Specimensb. Rod for 4-in. 101-mm Diameter SpecimensFIG. 5 Top Anvil RodsFIG. 6 Threaded Rod for
36、 Attachment of Top PlateFIG. 7 Washer for Threaded RodFIG. 8 Alignment Post for 4-in. 100-mm Diameter SpecimensC 1245/C 1245M 06410. Precision and Bias10.1 PrecisionPrecision of this test method was calcu-lated from results published in Saucier,3which comparedtensile strength of bonds and unbonded c
37、oncrete for fivemixtures of varying proportions. These data only representwithin laboratory data for a single laboratory. A report of thisanalysis is on file at ASTM International Headquarters, asResearch Report RR: C09-1025.410.1.1 The single-laboratory single-batch standard devia-tion for splittin
38、g tensile strength of unbonded concrete coreshas been found to be 23 psi 0.16 MPa5in 95 % of the cases.Therefore, results of tests on two cores taken from the samebatch of concrete should differ by no more than 106 psi0.73MPa5in 95 % of cases.10.1.2 The single-laboratory single-batch standard devia-
39、tion for splitting tensile bond strength of cores obtained from alayered specimen has been found to be 38 psi 0.26 MPa5in95 % of the cases. Therefore, results of tests on two cores takenfrom the same batch of concrete should differ by no more than106 psi 07.3 MPa in 95 % of cases.10.2 BiasThis test
40、method has no bias because there is nostandard material on which to estimate this property.11. Keywords11.1 bond strength; bonding agents; concrete bonding;roller-compacted concretes3Saucier, K. L. “No-Slump Roller Compacted Concrete (RCC) for Use in MassConcrete Construction,” Technical Report SL-8
41、4-17, U.S. Army Research andDevelopment Center, 3909 Halls Ferry Rd., Vicksburg, MS 39180, 1984.4Supporting data have been filed at ASTM International Headquarters and maybe obtained by requesting Research Report RR: C09-1025.5These numbers represent, respectively, the (ls) and (d2s) limits as descr
42、ibed inPractice C 670.FIG. 9 Alignment Post for 6-in. 150-mm Diameter SpecimensC 1245/C 1245M 065SUMMARY OF CHANGESCommittee C09 has identified the location of selected changes to this test method since the last issue,C 1245/C 1245M 03, that may impact the use of this test method. (Approved July 1,
43、2006)(1) Replaced Fig. 1 with a new schematic.(2) Deleted Fig. 2, a photo entitled “Test Specimen in TestingMachine” and renumbered all subsequent figures.ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin this standard.
44、 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 subject to revision at any time by the responsible technical committee and must be reviewed e
45、very 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 Headquarters. Your comments will receive careful consideration at a meeting of theresponsible tec
46、hnical 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 is copyrighted by ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshoho
47、cken, 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).TABLE 1 Metric Equivalent
48、for Figs. 2-9in. mm0.031 0.80.062 1.60.125 3.20.156 4.00.187 4.70.25 6.40.281 7.10.343 8.70.375 9.50.437 110.50 130.562 140.625 160.687 170.75 190.875 221.0 251.25 321.375 351.437 361.50 381.75 441.937 492.25 572.375 602.50 652.75 703.0 753.375 853.43 873.50 903.687 943.75 953.937 1004.375 1104.50 1154.75 1205.437 1385.50 1405.75 1456.50 1658.0 2008.25 205C 1245/C 1245M 066
