ASTM_D_7380_-_D_7380M_-_21.pdf

Designation:D7380/D7380M21Standard Test Method forSoil Compaction Determination at Shallow Depths Using2.3-kg 5-lbm Dynamic Cone Penetrometer1This standard is issued under the fixed designation D7380/D7380M;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 covers the procedure for the determi-nation of the number of drops required for a dynamic conepenetrometer with a 2.3-kg 5-lbm drop hammer falling508 mm 20 in.to penetrate a certain depth in compactedbackfill.1.2 The device is used in the compaction verification offine-and coarse-grained soils,granular materials,and weakstabilized or modified material used in subgrade,base layers,and backfill compaction in confined cuts and trenches atshallow depth.1.3 The test method is not applicable to highly stabilizedand cemented materials or granular materials containing a largepercentage of aggregates greater than 37 mm 1.5 in.1.4 The method is dependent upon knowing the field watercontent and the user having performed calibration tests todetermine cone penetration resistance of various compactionlevels and water contents.1.5 UnitsThe values stated in either SI units or inch-pound units are to be regarded separately as standard.Thevalues stated in each system are not necessarily exact equiva-lents;therefore,to ensure conformance with the standard,eachsystem shall be used independently of the other,and valuesfrom the two systems shall not be combined.Within the text ofthis standard,SI units appear first followed by the inch-poundor other non-SI units in brackets.Reporting of test results inunits other than SI shall not be regarded as nonconformancewith this standard.1.6 It is common practice in the engineering profession toconcurrently use pounds to represent both a unit of mass lbmand a force lbf.This implicitly combines two separatesystems of units;that is,the absolute system and the gravita-tional system.This standard has been written using theabsolute system of units when dealing with the inch-poundsystem.In this system,the pound lbf represents a unit of force(weight).However,the use of balances or scales recordingpounds of mass lbm or the reading of density in lbm/ft3shallnot be regarded as a nonconformance with this standard.1.7 All observed and calculated values shall conform to theguidelines for significant digits and rounding established inPractice D6026.1.8 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.1.9 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 ContainedFluidsD698 Test Methods for Laboratory Compaction Character-istics of Soil Using Standard Effort(12,400 ft-lbf/ft3(600kN-m/m3)D1556 Test Method for Density and Unit Weight of Soil inPlace by Sand-Cone MethodD1557 Test Methods for Laboratory Compaction Character-istics of Soil Using Modified Effort(56,000 ft-lbf/ft3(2,700 kN-m/m3)D2216 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 ConstructionD4959 Test Method for Determination of Water Content of1This test method is under the jurisdiction ofASTM Committee D18 on Soil andRock and is the direct responsibility of Subcommittee D18.08 on Special andConstruction Control Tests.Current edition approved Nov.1,2021.Published November 2021.Originallyapproved in 2008.Last previous edition approved in 2015 as D7380-15.DOI:10.1520/D7380_D7380M-21.2For 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 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 Barr