1、Designation:D216810Standard Practices forCalibration of Laboratory Mechanical-Rammer SoilCompactors1This standard is issued under the fixed designation D2168;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A
2、 number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.This standard has been approved for use by agencies of the U.S.Department of Defense.1.Scope*1.1 These practices for the calibration of mechanical so
3、ilcompactors are for use in checking and adjusting mechanicaldevices used in laboratory compacting of soil and soil-aggregate in accordance with Test Methods D698,D1557,Practice D6026,and other methods of a similar nature thatmight specify these practices.Calibration for use with onepractice does no
4、t qualify the equipment for use with anotherpractice.1.2 The weight of the mechanical rammer is adjusted asdescribed in 5.4 and 6.5 in order to provide for the mechanicalcompactor to produce the same result as the manual compactor.1.3 Two alternative procedures are provided as follows:SectionPractic
5、e ACalibration based on the compaction of aselected soil sample5Practice BCalibration based on the deformation of astandard lead cylinder61.4 If a mechanical compactor is calibrated in accordancewith the requirements of either Practice A or Practice B,it isnot necessary for the mechanical compactor
6、to meet therequirements of the other practice.1.5 The values stated in inch-pound units are to be regardedas the standard.The values given in parentheses are forinformation only.1.5.1 It is common practice in the engineering profession toconcurrently use pounds to represent both a unit of mass(lbm)a
7、nd a force(lbf).This implicitly combines two separatesystems of units;that is,the absolute system and the gravita-tional system.It is scientifically undesirable to combine the useof two separate sets of inch-pound units within a singlestandard.This standard has been written using the gravitationalsy
8、stem of units when dealing with the inch-pound system.Inthis system,the pound(lbf)represents a unit of force(weight).However,the use of balances or scales recording pounds ofmass(lbm)or the recording of density in lbm/ft3shall not beregarded as a nonconformance with this standard.1.6 This standard d
9、oes 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 Standa
10、rds: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)D1557 Test Methods for Laboratory Compaction Character-istics of Soil Using Modified Effort(56,000 ft-lbf/ft3(2,700 k
11、N-m/m3)D2487 Practice for Classification of Soils for EngineeringPurposes(Unified Soil Classification System)D3740 Practice for Minimum Requirements for AgenciesEngaged in Testing and/or Inspection of Soil and Rock asUsed in Engineering Design and ConstructionD6026 Practice for Using Significant Dig
12、its in GeotechnicalDataE11 Specification for Woven Wire Test Sieve Cloth and TestSievesE145 Specification for Gravity-Convection and Forced-Ventilation Ovens3.Significance and Use3.1 Mechanical compactors are commonly used to replacethe hand compactors required for Test Methods D698 andD1557 in case
13、s where it is necessary to increase production.1These practices are under the jurisdiction ofASTM Committee D18 on Soil andRock and are the direct responsibility of Subcommittee D18.03 on Texture,Plasticity and Density Characteristics of Soils.Current edition approved July 1,2010.Published August 20
14、10.Originallyapprroved in 1990.Last previous edition approved in 2002 as D216802a.DOI:10.1520/D2168-10.2For 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 Docu
15、ment 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 The design of mechanical compactors is such that it isnecessary to have a calibratio
16、n process that goes beyonddetermining the mass and drop of the hammer.NOTE1The quality of the result produced by this standard isdependent on the competence of the personnel performing it,and thesuitability of the equipment and facilities used.Agencies that meet thecriteria in Practice D3740 are generally considered capable of competentand objective testing/sampling/inspection/and the like.Users of thisstandard are cautioned that compliance with Practice D3740 does not initself assure reliable r
