1、Designation:D464317Standard Test Method forDetermination of Water Content of Soil and Rock byMicrowave Oven Heating1This standard is issued under the fixed designation D4643;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of
2、 last revision.A 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 This test method outlines procedures
3、 for determining thewater content of soils by incrementally drying soil in amicrowave oven.1.2 This test method can be used as a substitute for TestMethod D2216 when more rapid results are desired to expediteother phases of testing and slightly less accurate results areacceptable.1.3 When questions
4、of accuracy between this test methodand Test Method D2216 arise,Test Method D2216 shall be thereferee method.1.4 This test method is applicable for most soil types.Forsome soils,such as those containing significant amounts ofhalloysite,mica,montmorillonite,gypsum or other hydratedmaterials,highly or
5、ganic soils,or soils in which the pore watercontains significant amounts of dissolved solids(such as salt inthe case of marine deposits),this test method may not yieldreliable water content values due to the potential for heatingabove 110C or lack of means to account for the presence ofprecipitated
6、solids that were previously dissolved.1.5 The values stated in SI units are to be regarded as thestandard.Performance of the test method utilizing anothersystem of units shall not be considered non-conformance.Thesieve designations are identified using the“standard”system inaccordance with Specifica
7、tion E11,such as 2.0-mm and19-mm,followed by the“alternative”system of No.10 and34-in.,respectively,in parentheses.1.6 All observed and calculated values shall conform to theguidelines for significant digits and rounding established inPractice D6026,unless otherwise superseded by this standard.1.6.1
8、 The procedures used to specify how data are collected/recorded or calculated in this standard are regarded as theindustry standard.In addition,they are representative of thesignificant digits that generally should be retained.The proce-dures used do not consider material variation,purpose forobtain
9、ing the data,special purpose studies,or any consider-ations for the users objectives;and it is common practice toincrease or reduce significant digits of reported data to becommensurate with these considerations.It is beyond the scopeof this standard to consider significant digits used in analysisme
10、thods for engineering design.1.6.2 Significant digits are especially important if the watercontent will be used to calculate other relationships such asmoist mass to dry mass or vice versa,wet unit weight to dryunit weight or vice versa,and total density to dry density orvice versa.For example,if fo
11、ur significant digits are requiredin any of the above calculations,then the water content has tobe recorded to the nearest 0.1%,for water contents below100%.This occurs since 1 plus the water content(not inpercent)will have four significant digits regardless of what thevalue of the water content is(
12、below 100%);that is,1 plus0.1/100=1.001,a value with four significant digits.While,ifthree significant digits are acceptable,then the water contentcan be recorded to the nearest 1%.1.7 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is therespons
13、ibility 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.See Section 7.2.Referenced Documents2.1 ASTM Standards:2D653 Terminology Relating to Soil,Rock,and ContainedFluidsD2216 Test Methods for
14、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 ConstructionD4220 Practices for Preserving and Transporting SoilSamples1This test meth
15、od 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 Feb.1,2017.Published February 2017.Originallyapproved in 1987.Last previous edition approved in 2008 as D4643 08
16、.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.DOI:10.1520/D4643-08.*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 internatio