ASTM_D_6528_-_17.pdf

Designation:D652817Standard Test Method forConsolidated Undrained Direct Simple Shear Testing of FineGrain Soils1This standard is issued under the fixed designation D6528;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 defines equipment specifications andtesting procedures for the measurement of constant volumestrength and stress-strain characteristics of cohesive soils afterone-dimensional consolidation using a constant rate of simpleshear deformation mode of loading.The constant volumecondition is equivalent to the undrained condition for saturatedspecimens.1.2 This test method is written specifically for devices thattest rectangular parallelepiped or cylindrical specimens.Othermore general devices,such as the torsional shear hollowcylinder,may be used to perform consolidated constant volumesimple shear tests but are beyond the scope of this test method.1.3 This test method is applicable to testing intact,labora-tory reconstituted,and compacted soils,however,it does notinclude specific guidance for reconstituting or compacting testspecimens.1.4 It shall be the responsibility of the agency requestingthis test to specify the magnitude of the vertical consolidationstress prior to constant volume shear and,when appropriate,the maximum vertical consolidation stress,which will result inan overconsolidated specimen.1.5 UnitsThe values stated in SI units are to be regardedas the standard.No other units of measurement are included inthis standard.Reporting of test results in units other than SIshall not be regarded as nonconformance with this test method.1.5.1 In the engineering profession it is customary practiceto use,interchangeably,units representing both mass and force,unless dynamic calculations(F=Ma)are involved.This implic-itly combines two separate systems of units,that is,theabsolute system and the gravimetric system.It is scientificallyundesirable to combine two separate systems within a singlestandard.This test method has been written using SI units;however,inch-pound conversions are given in the gravimetricsystem,where the pound(lbf)represents a unit of force(weight).The use of balances or scales recording pounds ofmass(lbm),or the recording of density in lb/ft3should not beregarded as nonconformance with this test method.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 test standard are regarded as theindustry standard.In addition,they are representative of thesignificant digits that should generally 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;it is common practice toincrease or reduce significant digits of reported data to becommensurate with these considerations.It is beyond the scopeof this test standard to consider significant digits used inanalysis methods for engineering design.1.6.2 Measurements made to more significant digits orbetter sensitivity than specified in this standard shall not beregarded a nonconformance with this standard.1.7 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.1.8 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 ContainedFluids1This 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 Aug.1,2017.Published September 2017.Originallyapproved in 2000.Last previous edition approved in 2007 as D6528 07,which waswithdrawn January 2016 and reinstated in August 2017.DOI:10.1520/D6528-17.2For 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 States