ASTM_D_5873_-_14.pdf

Designation:D587314Standard Test Method forDetermination of Rock Hardness by Rebound HammerMethod1This standard is issued under the fixed designation D5873;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()indicates an editorial change since the last revision or reapproval.1.Scope*1.1 This test method covers the testing apparatus,sampling,test specimen preparation,and testing procedures for determin-ing the rebound hardness number of rock material using aspring-driven steel hammer,referred to variously as a reboundhammer,impact test hammer,or concrete test hammer.1.2 This test method is best suited for rock material withuniaxial compressive strengths ranging between approximately1 and 100 MPa.Test Method D7012 provides more informa-tion on compressive strength of rock.1.3 The portable testing apparatus may be used in thelaboratory or field to provide a means of rapid assessment ofrock hardness or to serve as an indicator of rock hardness.1.4 Rebound hammers are available from their originalmanufacturers in several different energy ranges.For a givenplunger tip diameter and radius of curvature,the impact energyof the rebound hammer determines its range of applicability.Accordingly,this limitation should be kept in mind whenselecting a hammer type.Earlier recommendations for rockmechanics applications were only for hammers with an impactenergy of 0.735 Nm,especially on smaller core samples andweaker rocks(see also Brown 19812).This test method appliesonly to hammers with an impact energy not to exceed 0.735Nm.Hammers with energies above 0.735 Nm tend to breakthe rock and are not recommended.1.5 Rocks exhibiting vesicular texture may be beyond thescope of this test.Care should be taken when testing such rocksand conglomerates as the rebound values will vary betweentesting a large piece of aggregate versus softer matrix of theconglomerate.1.6 All observed and calculated values shall conform to theguidelines for significant digits and rounding established inPractice D6026.1.6.1 The procedures used to specify how data are collected/recorded or calculated,in this standard are regarded as theindustry standard.In addition,they are representative of thesignificant digits that generally should be retained.The proce-dures used do not consider material variation,purpose forobtaining the data,special purpose studies,or any consider-ations for the users objectives;and it is common practice toincrease or reduce significant digits of reported data to becommensurate with these considerations.It is beyond the scopeof this standard to consider significant digits used in analyticalmethods for engineering design.1.7 For determining the rebound number of concrete,seeTest Method C805/C805M.1.8 UnitsThe values stated in SI units are to be regardedas standard.No other units of measurement are included in thisstandard.1.9 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:3C805/C805M Test Method for Rebound Number of Hard-ened ConcreteD653 Terminology Relating to Soil,Rock,and ContainedFluidsD2216 Test Methods for Laboratory Determination of Water(Moisture)Content of Soil and Rock by MassD3740 Practice for Minimum Requirements for AgenciesEngaged in Testing and/or Inspection of Soil and Rock asUsed in Engineering Design and ConstructionD4543 Practices for Preparing Rock Core as Cylindrical TestSpecimens and Verifying Conformance to Dimensionaland Shape Tolerances1This test method is under the jurisdiction ofASTM Committee D18 on Soil andRock and is the direct responsibility of Subcommittee D18.12 on Rock Mechanics.Current edition approved Feb.1,2014.Published February 2014.Originallyapproved in 1995.Last previous edition approved in 2013 as D5873 13.DOI:10.1520/D5873-14.2Brown,E.T.,ed.,Suggested Methods:Rock Characterization,Testing,andMonitoring,International Society of Rock Mechanics(ISRM):Pergamon Press,London,1981.3For 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 D4879 Guide for Geotechnical Mapping of Large Under-ground Openings in RockD6026 Practice for Using Significant Digits in GeotechnicalDataD7012 Test Methods for Compressive Strength and ElasticModuli of Intact Rock Core Specimens under VaryingStates of Stress and Temperatures3.Termino