ASTM_C_1245_-_C_1245M_-_12.pdf

Designation:C1245/C1245M12Standard Test Method forDetermining Relative Bond Strength Between HardenedRoller Compacted Concrete Lifts(Point Load Test)1This standard is issued under the fixed designation C1245/C1245M;the number immediately following the designation indicates 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 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 roller-compacted concretewhere the total depth is sufficient to meet the minimumspecimen length and diameter requirements of this test method.This test method is not intended to provide tensile strengthresults of the material tested.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 equivalents;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 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 determine the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2C39/C39M Test Method for Compressive Strength of Cylin-drical Concrete SpecimensC42/C42M Test Method for Obtaining and Testing DrilledCores and Sawed Beams of ConcreteC125 Terminology Relating to Concrete and Concrete Ag-gregatesC192/C192M Practice for Making and Curing Concrete TestSpecimens 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 Vibrating TableC1435/C1435M Practice for Molding Roller-CompactedConcrete in Cylinder Molds Using a Vibrating HammerD1557 Test Methods for Laboratory Compaction Character-istics of Soil Using Modified Effort(56,000 ft-lbf/ft3(2,700 kN-m/m3)3.Terminology3.1 Refer to Terminology C125 for definitions of terms usedin this test method.4.Significance and Use4.1 This test method is used to measure the relative bondstrength of roller-compacted concrete to other roller-compacted concrete by using a point load test at the joint(seeNote 1).Relative bond strength is determined using drilledcores or cast cylindrical specimens in which the bond surfaceis essentially normal to the longitudinal axis at approximatelythe mid-length of the specimen.A splitting tensile stressnormal to the bond surface is produced by applying a pointload at the joint.4.2 The test results in a value that can be compared to thatobtained by testing other specimens which are made from thesame materials and by the same process.Results can be usedfor the purpose of comparing the relative bond strength ofvarious joint conditions,joint treatments,or bonding materialsapplied to the joint.4.3 The test results are not to be taken as a true bondstrength.Values of cohesion or tensile strength shall bedetermined by methods other than this test method.4.4 This test method may be used either for laboratoryinvestigation by casting individual composite cylinders or bycoring prototype structures or assemblies(Test Method C42/C42M).NOTE1This test may be used for testing the relative bond of other1This 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 April 1,2012.Published May 2012.Originallyapproved in 1993.Last previous edition approved in 2011 as C1245/C1245M 11.DOI:10.1520/C1245_C1245M-12.2For 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.*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 hardened hydraulic cement-based materials other than RCC.5.Apparatus5.1 Testing MachineThe testing machine shall conform tothe requirements of Test Method C39/C39M.5.2 Testing ApparatusThe testing apparatus shall be con-structed of steel and allow the testing of both 100 and 150-mm4 and 6-in.diameter sp