ASTM_D_4123_-_82_1995.pdf

Designation:D 4123 82(Reapproved 1995)Standard Test Method forIndirect Tension Test for Resilient Modulus of BituminousMixtures1This standard is issued under the fixed designation D 4123;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon(e)indicates an editorial change since the last revision or reapproval.1.Scope1.1 This test method covers procedures for preparing andtesting laboratory-fabricated or field-recovered cores of bitu-minous mixtures to determine resilient modulus values usingthe repeated-load indirect tension test.The procedure describedcovers a range of temperatures,loads,loading frequencies,andload durations.The recommended test series consists of testingat 41,77(Note 1),and 104F(5,25(Note 1),and 40C)at oneor more loading frequencies,for example,at 0.33,0.5,and 1.0Hz for each temperature.This recommended series will resultin nine test values for one specimen which can be used toevaluate the overall resilient behavior of the mixture.NOTE1Ambient laboratory temperature may be substituted as appro-priate.1.2 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:D 1559 Test Method for Resistance to Plastic Flow ofBituminous Mixture Using Marshall Apparatus2D 1561 Practice for Preparation of Bituminous Mixture TestSpecimens by Means of California Kneading Compactor2D 3387 Test Method for Compaction and Shear Propertiesof Bituminous Mixtures by Means of the U.S.Corps ofEngineers Gyratory Testing Machine(GTM)2D 3496 Method for Preparation of Bituminous MixtureSpecimens for Dynamic Modulus Testing2D 3515 Specification for Hot-Mixed,Hot-Laid BituminousPaving Mixtures23.Summary of Test Method3.1 The repeated-load indirect tension test for determiningresilient modulus of bituminous mixtures is conducted byapplying compressive loads with a haversine or other suitablewaveform.The load is applied vertically in the verticaldiametral plane of a cylindrical specimen of asphalt concrete(Fig.1).The resulting horizontal deformation of the specimenis measured and,with an assumed Poissons ratio,is used tocalculate a resilient modulus.A resilient Poissons ratio canalso be calculated using the measured recoverable vertical andhorizontal deformations.3.2 Interpretation of the deformation data(Fig.2)hasresulted in two resilient modulus values being used.Theinstantaneous resilient modulus is calculated using the recov-erable deformation that occurs instantaneously during theunloading portion of one cycle.The total resilient modulus iscalculated using the total recoverable deformation whichincludes both the instantaneous recoverable and the time-dependent continuing recoverable deformation during the un-loading and rest-period portion of one cycle.4.Significance and Use4.1 The values of resilient modulus can be used to evaluatethe relative quality of materials as well as to generate input forpavement design or pavement evaluation and analysis.The testcan be used to study effects of temperature,loading rate,restperiods,etc.Since the procedure is nondestructive,tests can berepeated on a specimen to evaluate conditioning as withtemperature or moisture.This test method is not intended foruse in specifications.5.Apparatus5.1 Testing MachineThe testing machine should have thecapability of applying a load pulse over a range of frequencies,load durations,and load levels.NOTE2An electrohydraulic testing machine with a function generatorcapable of producing the desired wave form has been shown to be suitablefor use in repeated-load indirect tension testing.Other commerciallyavailable or laboratory constructed testing machines such as those usingpneumatic repeated loading can also be used.However,these lattermachines may not have the load capability to handle larger specimens atthe colder testing temperatures.5.2 Temperature-Control SystemThe temperature-controlsystem should be capable of control over a temperature rangefrom 41 to 104F(5 to 40C)and within 62F(61.1C)of thespecified temperature within the range.The system shouldinclude a temperature-controlled cabinet large enough to holdat least three specimens for a period of 24 h prior to testing.1This test method is under the jurisdiction of ASTM Committee D-4 on Roadand Paving Materials and is the direct responsibility of Subcommittee D04.26 onFundamental/Mechanistic Tests.Current edition approved April 30,1982.Published June 1982.2Annual Book of ASTM Standards,Vol 04.03.1AMERICAN SOCIETY FOR TESTING AND MATERIALS100 Barr Harbor Dr.,West Conshohocken,PA 19428Reprinted from the Annual Book of ASTM Standards.Copyright ASTM5.3 Measurement and Recordin