1、Designation: C1245/C1245M 11Standard Test Method forDetermining Bond Strength Between Hardened RollerCompacted Concrete and Other Hardened CementitiousMixtures (Point Load Test)1This standard is issued under the fixed designation C1245/C1245M; the number immediately following the designation indicat
2、es 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 () indicates an editorial change since the last revision or reapproval.1. Scope*1.1 This test method is intended for testing rol
3、ler-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 specimen
4、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 either SI units or inch-pound unitsare to be regarded separately as standard. The values stated ineach system may not be exact equ
5、ivalents; therefore, eachsystem shall be used independently of the other. Combiningvalues from the two systems may result in non-conformancewith the standard.1.3 The text of this standard references notes and footnotes,which provide explanatory material. These notes and footnotes(excluding those in
6、tables and figures) shall not be consideredas requirements of this standard.1.4 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 determi
7、ne the applica-bility of regulatory limitations prior to use.2. Referenced Documents2.1 ASTM Standards:2C39/C39M Test Method for Compressive Strength of Cy-lindrical Concrete SpecimensC42/C42M Test Method for Obtaining and Testing DrilledCores and Sawed Beams of ConcreteC125 Terminology Relating to
8、Concrete and Concrete Ag-gregatesC192/C192M Practice for Making and Curing ConcreteTest Specimens in the LaboratoryC670 Practice for Preparing Precision and Bias Statementsfor Test Methods for Construction MaterialsC1176/C1176M Practice for Making Roller-CompactedConcrete in Cylinder Molds Using a V
9、ibrating TableC1435/C1435M Practice for Molding Roller-CompactedConcrete in Cylinder Molds Using a Vibrating HammerD1557 Test Methods for Laboratory Compaction Charac-teristics of Soil Using Modified Effort (56,000 ft-lbf/ft3(2,700 kN-m/m3)3. Terminology3.1 Refer to Terminology C125 for definitions
10、of terms usedin this test method.4. Significance and Use4.1 This test method is used to measure the effectiveness ofbonding roller-compacted concrete to other roller-compactedconcrete or other hardened cementitious mixtures by using apoint load test at the joint. Bond strength is determined usingdri
11、lled cores or cast cylindrical specimens in which the bondsurface is essentially normal to the longitudinal axis at approxi-mately the mid-length of the specimen.Asplitting tensile stressnormal to the bond surface is produced by applying a pointload at the joint.4.2 This test method may be used eith
12、er for laboratoryinvestigation by casting individual composite cylinders or bycoring prototype structures or assemblies (Test Method C42/C42M).5. Apparatus5.1 Testing MachineThe testing machine shall conform tothe requirements of Test Method C39/C39M.5.2 Testing ApparatusThe testing apparatus shall
13、be con-structed of steel and allow the testing of both 100 and 150-mm4 and 6-in. diameter specimens. The test schematic is given inFig. 1. The testing apparatus shall permit the positioning of aspecimen such that the joint of the bonded surfaces is oriented1This test method is under the jurisdiction
14、 of ASTM Committee C09 onConcrete and Concrete Aggregates and is the direct responsibility of SubcommitteeC09.45 on Roller-Compacted Concrete.Current edition approved April 1, 2011. Published May 2011. Originallyapproved in 1993. Last previous edition approved in 2006 as C1245/C1245M06.DOI: 10.1520/
15、C1245_C1245M-11.2For 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 website.1*A Summary of Changes section appears at the
16、 end of this standard.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.as closely as possible parallel to the direction of loading. Figs.2-5 provide the information necessary to construct the appara-tus for 100 and 150-mm 4 and 6-in. d
17、iameter specimens.Anvil rods (Fig. 2 and Fig. 3) shall have a hardness of not lessthan 55 HRC (Rockwell hardness number of 55 on the C scale)and shall be plane on the bearing surfaces to within 60.025mm 0.001 in. The alignment post shall ensure that the anvilrods are kept parallel to each other in t
18、he vertical plane. Thesystem is easily adaptable to most testing machines.6. Test Specimens6.1 Test specimens shall be cast cylinders or cores. Cylin-ders shall be cast in accordance with Practice C1176/C1176M,Practice C1435/C1435M, or Test Method D1557 and be 100 or150 mm 4 or 6 in. in diameter. Co
19、res shall be obtained inaccordance with Practice C42/C42M and be 100 or 150 mm 4or 6 in in diameter. Cut specimen to ensure that the plane bestdescribing the bond surface is oriented at 90 6 15 to the longaxes of the specimens.6.2 Cure molded test specimens in accordance with PracticeC192/C192M (lab
20、oratory specimens). Drilled cores shall bemoisture conditioned in accordance with Test Method C42/C42M.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 surface undulates grossly, th
21、at is, the surfacehas a local texture exceeding 15 mm 0.5 in. in amplitude, 150-mm 6-in.diameter cores are preferable. No information is available on the relativeresults of 150-mm 6-in. versus 100-mm 4-in. diameter specimens.7. Procedure7.1 MeasurementsDetermine the diameter of the testspecimens by
22、averaging three diameters measured on the bondsurface. Visually identify the bond surface by color, texture, ormaterial contrasts. Measure diameters to the nearest 0.25 mm0.01 in. with calipers, whenever possible, but at least to thenearest 2.5 mm 0.1 in. Determine the length of each sectionFIG. 1 S
23、chematic of Loading MethodC1245/C1245M 112of the bonded specimens to the nearest 2.5 mm 0.1 in., 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 65mm0.25 in.) of the specim
24、en. If the bond plane is not atmid-length of the specimen, the section on each side of theNOTEDimensions are shown in mm, refer to Table 1 for values ininches.NOTEx =L275!2, where L is the length of the anvil rod or diameterof the top plate.FIG. 2 Top Plate and Anvil RodC1245/C1245M 113bond plane sh
25、all be of a length at least 0.6 the diameter. Wherethe bond surface is irregular or undulating, mark on thespecimen a line representing a plane extending through andNOTEDimensions are shown in mm, refer to Table 1 for values ininches.FIG. 3 Base Plate and Anvil RodC1245/C1245M 114along the approxima
26、te average bearing of the bond surface, andmeasure the length from this line.NOTE 3Many drilled cores will not be smooth enough to justify themeasurement of diameters closer than to the nearest 2.5 mm 0.1 in.7.2 PositioningAssemble and position the apparatus inthe testing machine. Place the specimen
27、 on the bottom platewith the joint in contact with the anvil rods (see Fig. 1). Thelonger anvil rods (Fig. 2 and Fig. 3) and the longer alignmentpost (Fig. 5) are used to test 150-mm 6-in. diameter speci-mens. The shorter anvil rods (Fig. 2 and Fig. 3) and the shorteralignment post (Fig. 4) are used
28、 to test 100-mm 4-in.diameter 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 topanvil into contact with
29、 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 bondsurface at the contac
30、t point on the circumference of thespecimen.7.3 LoadingDo not preload the specimen. Apply the loadat a uniform rate within the range of 1 to 1.4 MPa/min 150 to200 psi/min until the specimen fails. Record the maximumload applied.8. Calculation8.1 Calculate the strength of the bond as follows:ftb5PD2N
31、OTEDimensions are shown in mm, refer to Table 1 for values ininches.FIG. 4 Alignment Post for 100 mm 4 in Diameter SpecimensC1245/C1245M 115where:ftb= bond strength, MPa psi,P = maximum applied load, N lbf, andD = average specimen diameter at bond surface, mm in.9. Report9.1 Report the following inf
32、ormation: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 fabrication including the practice or testmetho
33、d 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 necessary to describe theproduction or featu
34、res 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 0.1 MPa 10 psi.9.1.7 Mode of failure:9.1.7.1 Whether bond failure or aggregate fai
35、lure, 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), andNOTEDimensions are shown in mm, refer to Table 1 for values ininches.F
36、IG. 5 Alignment Post for 150 mm 6 in Diameter SpecimensC1245/C1245M 116detailed descriptions of 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 pla
37、ne of fracture occurpartially or totally within the concrete layers adjacent to thebond surface, 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.10. Precision and Bias10.1 Preci
38、sionPrecision of this test method was calcu-lated from results published in Saucier,3which comparedtensile strength of bonds and unbonded concrete for fivemixtures of varying proportions. These data only representwithin laboratory data for a single laboratory. A report of thisanalysis is on file at
39、ASTM International Headquarters, asResearch Report RR:C09-1025.410.1.1 The single-laboratory single-batch standard devia-tion for splitting tensile strength of unbonded concrete coreshas been found to be 0.16 MPa 23 psi5in 95 % of the cases.Therefore, results of tests on two cores taken from the sam
40、ebatch of concrete should differ by no more than 0.44 MPa 64psi5in 95 % of cases.10.1.2 The single-laboratory single-batch standard devia-tion for splitting tensile bond strength of cores obtained from alayered specimen has been found to be 0.26 MPa 38 psi5in95 % of the cases. Therefore, results of
41、tests on two cores takenfrom the same batch of concrete should differ by no more than0.73 MPa 106 psi in 95 % of cases.10.2 BiasThis test 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
42、-compacted concretesSUMMARY OF CHANGESCommittee C09 has identified the location of selected changes to this test method since the last issue,C1245/C1245M06, that may impact the use of this test method. (Approved April 1, 2011)(1) Reordered all units so that SI units appear first.(2) Replaced old Fig
43、ures 2-9 with new Figs. 2-5.(3) Replaced old Table 1 with new Table 1 showing rational-ized units with SI units listed first.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 ex
44、pressly 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 andif not revi
45、sed, 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, which you ma
46、y 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 19428-2959,United Sta
47、tes. 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 standard may also be
48、 secured from the ASTM website (www.astm.org/COPYRIGHT/).3Saucier, K. L. “No-Slump Roller Compacted Concrete (RCC) for Use in MassConcrete Construction,” Technical Report SL-84-17, U.S. Army Research andDevelopment Center, 3909 Halls Ferry Rd., Vicksburg, MS 39180, 1984.4Supporting data have been fi
49、led at ASTM International Headquarters and maybe obtained by requesting Research Report RR:C09-1025.5These numbers represent, respectively, the (ls) and (d2s) limits as described inPractice C670.TABLE 1 Inch-Pound Equivalents for Figs. 2-5mm in.1 0.0392 0.0794 0.1576 0.2368 0.31511 0.43313 0.51214 0.55115 0.59116 0.63017 0.66925 0.98429 1.14240 1.57545 1.77265 2.55970 2.75675 2.95390 3.54395 3.740100 3.937115 4.528120 4.724130 5.118140 5.512145 5.709150 5.906165 6.496C1245/C1245M 117
