ASTM_D_8121_-_D_8121M_-_19.pdf

Designation:D8121/D8121M19Standard Test Method forApproximating the Shear Strength of Cohesive Soils by theHandheld Vane Shear Device1This standard is issued under the fixed designation D8121/D8121M;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.Scope1.1This test method describes approximating the shearstrength of cohesive soils using a handheld(pocket)vane sheardevice.1.2 The device allows for a simple and portable method formeasuring the approximate undrained shear strength ofsaturated,fine-grained,cohesive soils.The test method can beused in the field or in the laboratory,on the ends of sampletubes,on the surface of block samples or excavations,or on thesurface of other test specimens with rigid confinement.1.3 UnitsThe values stated in either inch-pound units orSI units given in brackets are to be regarded separately asstandard.The values stated in each system may not be exactequivalents;therefore,each system shall be used independentlyof the other.Combining values from the two systems mayresult in non-conformance with the standard.Tables of criticaldimensions and tolerances of the described vanes are providedin separate units of inches and mm.NOTE1The original shear vane device was developed when shearstrength was often reported in tons per square foot(TSF)or kilograms persquare centimeter(kg/cm2)which are approximately equivalent.Theseunits have prevailed within the industry and are adopted herein.1.4 All observed and calculated values shall conform to theguidelines for significant digits and rounding established inPractice D6026,unless superseded by this test method.1.4.1 The procedures used to specify how data are collected,recorded,and calculated in this standard are regarded as theindustry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 test method to consider significant digits used inanalysis methods for engineering design.1.5 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,health,and environmental practices and deter-mine the applicability of regulatory limitations prior to use.1.6 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:2D653 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 ConstructionD4648 Test Methods for Laboratory Miniature Vane ShearTest for SaturatedFine-Grained Clayey SoilD6026 Practice for Using Significant Digits in GeotechnicalData3.Terminology3.1 Definitions:3.1.1 For common definitions of technical terms used in thistest method,refer to Terminology D653.3.2 Definitions of Terms Specific to This Standard:3.2.1 vane multiplier(VM),na multiplier to correct thevanes dial reading based on the standard(mid-size)vane to thelarger or smaller vane(4.2).1This test method is under the jurisdiction ofASTM Committee D18 on Soil andRock and is the direct responsibility of Subcommittee D18.05 on Strength andCompressibility of Soils.Current edition approved May 1,2019.Published June 2019.Originallyapproved in 2018.Last previous edition approved in 2018 as D8121/D8121M 18.DOI:10.1520/D8121_D8121M-192For 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.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade(TBT)Committee.1 3.2.2 calibration factor(CF),ncorrection to the vanesdial reading