1、Designation:D551521Standard Test Method forDetermination of the Swelling Properties of Bituminous CoalUsing a Dilatometer1This standard is issued under the fixed designation D5515;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the y
2、ear 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.INTRODUCTIONThe principle of this test method is that the final volume of char obtained at the conclusion of astandard dilatati
3、on test is dependent on the mass of coal in the coal pencil and on the radius of theretort tube.This test method incorporates a procedure which:determines the mass of air-dried coal inthe coal pencil;provides a means to measure the average retort tube radii;and employs a means toreport coal expansio
4、n on an air dried coal mass basis.Other test methods used to determine the swelling properties of bituminous coals include the Ruhr(ISO 8264)and Audibert-Arnu(ISO 349)International Standard Organization(ISO)test methods.However these two ISO test methods provide consistently different values for per
5、cent dilatation andpercent contraction.Percent contraction and dilatation values obtained using the Audibert-Arnu testmethod are higher and lower respectively than those obtained using the Ruhr test method.Thesedifferences have been attributed to trimming the length of the coal pencil from different
6、 ends.TheAudibert-Arnu test method specifies that the wider end of the coal pencil be trimmed,while the Ruhrtest method specifies that the narrower end of the coal pencil be trimmed.1.Scope1.1 This test method specifies a procedure for the measure-ment of the swelling of bituminous coal using a dila
7、tometer.1.2 The test method is limited in applicability to those coalswhich have a free swelling index 1 as determined in accor-dance with Test Method D720.1.3 UnitsThe values stated in SI units are to be regardedas standard.The values given in parentheses after SI units areprovided for information
8、only and are not considered standard.1.4 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,health,and environmental practices and deter-mine the applicability of reg
9、ulatory limitations prior to use.1.5 This international standard was developed 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 O
10、rganization TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:2D720 Test Method for Free-Swelling Index of CoalD2013 Practice for Preparing Coal Samples for AnalysisD2234/D2234M Practice for Collection of a Gross Sampleof Coal2.2 ISO Standards:3ISO 349 Hard Coal-Audib
11、ert-Arnu Dilatometer TestISO 8264 Hard CoalDetermination of the Swelling Prop-erties Using a Dilatometer3.Terminology3.1 Definitions:3.1.1 air-dried coal pencil mass,Mdrythe calculated massof the trimmed 60 mm long coal pencil corrected for addedwater,expressed in grams.1This test method is under th
12、e jurisdiction of ASTM Committee D05 on Coaland Coke and is the direct responsibility of Subcommittee D05.15 on MetallurgicalProperties of Coal and Coke.Current edition approved April 1,2021.Published April 2021.Originallyapproved in 1994.Last previous edition approved in 2020 as D5515 20.DOI:10.152
13、0/D5515-21.2For 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.3Available from International Organization for Standard
14、ization(ISO),1,ch.dela Voie-Creuse,Case postale 56,CH-1211,Geneva 20,Switzerland,http:/www.iso.ch.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United StatesThis international standard was developed in accordance with internationally recognized princi
15、ples 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.13.1.2 basement level reference mark height,BLRMhtthechar height as measured usi
16、ng the BLRM,after removing thepiston/retort assembly as a unit after completion of the test,expressed in millimetres.3.1.3 coal pencila 60 mm long test specimen formed bycompression in a mold from coal which has been pulverized topass a 250 m(No.60 U.S.standard sieve)sieve.3.1.4 equivalent percent dilatation for 2.50 g of air driedcoal,%D2.50the calculated percent expansion for a 2.50 g,unmoistened,60 mm long,coal pencil corrected for averagetube radii,expressed as a percentage.3.1.5 maximum con
