ASTM_D_7380_-_15.pdf

Designation:D738015Standard Test Method forSoil Compaction Determination at Shallow Depths Using5-lb(2.3 kg)Dynamic Cone Penetrometer1This standard is issued under the fixed designation D7380;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 procedure for the determi-nation of the number of drops required for a dynamic conepenetrometer with a 5-lb(2.3-kg)drop hammer falling 20 in.(508 mm)to penetrate a certain depth in compacted backfill.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 1.5 in.(37 mm).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 The values stated in inch-pound units are to be regardedas standard.The values given in parentheses are mathematicalconversions to SI units that are provided for information onlyand are not considered standard.1.6 It is common practice in the engineering profession toconcurrently use pounds to represent both a unit of mass(lbm)and 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 thegravitational 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 and health practices and determine the applica-bility of regulatory limitations prior to use.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(Moisture)Content of Soil By Direct HeatingD6026 Practice for Using Significant Digits in GeotechnicalDataD6938 Test Methods for In-Place Density and Water Contentof Soil and Soil-Aggregate by Nuclear Methods(ShallowDepth)D6951 Test Method for Use of the Dynamic Cone Penetrom-eter in Shallow Pavement ApplicationsE691 Practice for Conducting an Interlaboratory Study toDetermine the Precision of a Test Method3.Terminology3.1 DefinitionsFor definitions of common technical termsused in this standard,refer to Terminology D653.1This 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.1,2015.Published November 2015.Originallyapproved in 2008.Last previous edition approved in 2008 as D7380-08.DOI:10.1520/D7380-15.2For 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 States1 3.2 Definitions of Terms Specific to This Standard:3.2.1 5-lb dynamic cone penetrometer(5-lb DCP)(Fig.1)a device that uses a 5-lb(2.3-kg)hammer to penetrate a conetip inside the soil where the number of drops needed topenetrate a certain distance between two marks on the drivingrod is used to determine soil compaction effort.3.2.2 extension rodin dynamic cone penetrometer,anoptional extension of the driving rod to allow the use of the5-lb DCP in dee