1、Designation:D6951/D6951M18Standard Test Method forUse of the Dynamic Cone Penetrometer in ShallowPavement Applications1This standard is issued under the fixed designation D6951/D6951M;the number immediately following the designation indicates theyear of original adoption or,in the case of revision,t
2、he 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.Scope1.1 This test method covers the measurement of the pen-etration rate of the dynamic cone penetrometer with an 8-kg17
3、.6-lb hammer(8-kg 17.6-lb DCP)through undisturbedsoil or compacted materials,or both.The penetration rate maybe related to in situ strength such as an estimated in situ CBR(California Bearing Ratio).A soil density may be estimated(Note 1)if the soil type and moisture content are known.TheDCP describ
4、ed in this test method is typically used forpavement applications.1.2 The test method provides for an optional 4.6-kg 10.1-lb sliding hammer when the use of the 8-kg 17.6-lb slidingmass produces excessive penetration in soft ground conditions.1.3 UnitsThe values stated in either SI units or inch-pou
5、nd units are to be regarded separately as standard.Thevalues stated in each system may not be exact equivalents;therefore,each system shall be used independently of the other.Combining values from the two systems may result in noncon-formance with the standard.1.4 This standard does not purport to a
6、ddress 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.1.5 This international standard was develop
7、ed 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
8、.1 ASTM Standards:2D7380 Test Method for Soil Compaction Determination atShallow Depths Using 5-lb(2.3 kg)Dynamic ConePenetrometer3.Terminology3.1 Definitions:3.1.1 8-kg 17.6-lb DCP dynamic cone penetrometer,nadevice with an 8-kg 17.6-lb hammer used to assess the in situstrength of undisturbed soil
9、or compacted materials,or both,bydropping the hammer from a set height and measuring thedepth of penetration and counting hammer drops(blows).(SeeFig.1.)3.1.2 sliding attachment,nan optional device used inreading the distance the DCP tip has penetrated.It may befastened to the anvil or lower rod to
10、hold/slide along a separatemeasuring rod,or it may be fastened to the separate rod andslide along a graduated drive rod.(See Fig.1.)4.Summary of Test Method4.1 The operator drives the DCP tip into soil by lifting thesliding hammer to the handle and then releasing it.The totalpenetration for a given
11、number of blows is measured andrecorded in mm/blow,which is then used to describe stiffness,estimate an in situ CBR strength from an appropriate correla-tion chart,or other material characteristics.5.Significance and Use5.1 This test method is used to assess in situ strength ofundisturbed soil and c
12、ompacted materials(or both).Thepenetration rate of the 8-kg 17.6-lb DCP can be used toestimate in situ CBR(California Bearing Ratio),to identifystrata thickness,shear strength of strata,and other materialcharacteristics.1This test method is under the jurisdiction of ASTM Committee E17 on Vehicle-Pav
13、ement Systems and is the direct responsibility of Subcommittee E17.41 onPavement Testing and Evaluation.Current edition approved May 1,2018.Published May 2018.Originallyapproved in 2003.Last previous edition approved in 2015 as D6951/D6951M 09(2015).DOI:10.1520/D6951_D6951M-18.2For referenced ASTM s
14、tandards,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 1942
15、8-2959.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 Technica
16、l Barriers to Trade(TBT)Committee.1 5.1.1 Other test methods exist for DCPs with differenthammer weights and cone tip sizes,which have correlationsthat are unique to the instrument,such as Test Method D7380.5.2 The 8-kg 17.6-lb DCP is held vertically,and thereforeis typically used in horizontal construction applications,suchas pavements and floor slabs.5.3 This instrument is typically used to assess materialproperties down to a depth of 1000 mm 39 in.below thesurface.The penetration depth can be