1、Designation:D42517Standard Test Method forCentrifuge Moisture Equivalent of Soils1This standard is issued under the fixed designation D425;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 parenthe
2、ses 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 determination of the mois-ture equivalent of soil in the laboratory by means of acentrifuge technique.1.2 This test method is li
3、mited to specimens of coarse-grained sandy soils having a maximum particle size of less than2.00 mm and with fines of low plasticity.Soils having a unifiedsoil classification,based upon procedures outlined in PracticeD2488 such as SP,SW,SC-SM,or SM are consideredacceptable for the test method.1.2.1
4、For soils that are predominantly fine-grained,coarse-grained soils with medium to high plasticity,intact specimensor soils being tested at a specific density or unit weight refer toTest Methods D6836.1.3 This test method is intended to be performed in aconstant temperature environment.Variations in
5、temperatureexceeding the range outlined in 8.7 may influence the test data.1.4 UnitsThe values stated in SI units are to be regardedas the standard except for sieve designations,which alsoinclude the“alternative”system in accordance with E11.1.5 All recorded and calculated values shall conform to th
6、eguide for significant digits and rounding established in PracticeD6026.1.6 The procedures used to specify how data are collected/recorded and calculated in this standard are regarded as theindustry standard.In addition,they are representative of thesignificant digits that generally should be retain
7、ed.The proce-dures used do not consider material variation,purpose forobtaining data,special purpose studies,or any considerationsfor the users objectives;and it is common practice to increaseor reduce significant digits of reported data to commensuratewith these considerations.It is beyond the scop
8、e of these testmethods to consider significant digits used in analysis methodsfor engineering design.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 and health
9、 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 ContainedFluidsD2216 Test Methods for Laboratory Determination of Water(Moisture)Content of Soil and Rock by MassD2487 Practice for
10、Classification of Soils for EngineeringPurposes(Unified Soil Classification System)D2488 Practice for Description and Identification of Soils(Visual-Manual Procedure)D3740 Practice for Minimum Requirements for AgenciesEngaged in Testing and/or Inspection of Soil and Rock asUsed in Engineering Design
11、 and ConstructionD4753 Guide for Evaluating,Selecting,and Specifying Bal-ances and Standard Masses for Use in Soil,Rock,andConstruction Materials TestingD6026 Practice for Using Significant Digits in GeotechnicalDataD6836 Test Methods for Determination of the Soil WaterCharacteristic Curve for Desor
12、ption Using HangingColumn,Pressure Extractor,Chilled Mirror Hygrometer,or CentrifugeE11 Specification for Woven Wire Test Sieve Cloth and TestSieves3.Terminology3.1 Definitions:3.1.1 For definitions of common technical terms used in thisstandard,refer to Terminology D653.3.2 Definitions of Terms Spe
13、cific to This Standard:3.2.1 capillary fringe zonethe zone above the free waterelevation in which water is held by capillary action.1This test method is under the jurisdiction ofASTM Committee D18 on Soil andRock and is the direct responsibility of Subcommittee D18.03 on Texture,Plasticityand Densit
14、y Characteristics of Soils.Current edition approved Jan.15,2017.Published January 2017.Originallyapproved in 1935.Last previous edition approved in 2008 as D425 88(2008).DOI:10.1520/D0425-17.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at service
15、astm.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 StatesTh
16、is 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 Barriers to Trade(TBT)Committee.1 3.2.2 centrifuge moisture equivalentthe water content of asoil after it has been saturated with water and then subjected forone hour to a centrifugal force equal to 1000 times that ofgra
