1、Designation:D479119Standard Test Method forFlat Particles,Elongated Particles,or Flat and ElongatedParticles in Coarse Aggregate1This standard is issued under the fixed designation D4791;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revisio
2、n,the year 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.This standard has been approved for use by agencies of the U.S.Department of Defense.1.Scope1.1 This test method covers
3、the determination of the per-centages of flat particles,elongated particles,or flat andelongated particles in coarse aggregates.Two procedures,Method A and Method B,are presented in this standard.MethodAis a reflection of the original procedure as developedprior to Superpave and is intended for all
4、non-Superpaveapplications.Method B is a comparison of the maximumparticle dimension to the minimum particle dimension and isintended for use with Superpave specifications.1.2 The values stated in inch-pound units are to be regardedas standard.The values given in parentheses are mathematicalconversio
5、ns to SI units that are provided for information onlyand are not considered standard.1.2.1 Exception(regarding sieves,per Specification E11)The values stated in SI units shall be considered standard forthe dimensions of the wire cloth openings and the diameter ofthe wires used in the wire cloth.When
6、 sieve mesh sizes arereferenced,the alternate inch-pound designations are providedfor information purposes and enclosed in parenthesis.1.3 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 establ
7、ish appro-priate safety,health,and environmental practices and deter-mine the applicability of regulatory limitations prior to use.1.4 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for
8、 theDevelopment of International Standards,Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:2C136/C136M Test Method for Sieve Analysis of Fine andCoarse AggregatesC670 Practice for Preparing Precision
9、 and Bias Statementsfor Test Methods for Construction MaterialsC702/C702M Practice for Reducing Samples of Aggregateto Testing SizeD75/D75M Practice for Sampling AggregatesE11 Specification for Woven Wire Test Sieve Cloth and TestSievesE177 Practice for Use of the Terms Precision and Bias inASTM Tes
10、t MethodsE691 Practice for Conducting an Interlaboratory Study toDetermine the Precision of a Test Method3.Terminology3.1 Definitions:3.1.1 elongated particles of aggregatethose particles ofaggregate having a ratio of length to width greater than aspecified value.3.1.2 flat and elongated particles o
11、f aggregatethose par-ticles having a ratio of length to thickness greater than aspecified value.3.1.3 flat particles of aggregatethose particles of aggre-gate having a ratio of width to thickness greater than a specifiedvalue.3.1.4 lengthmaximum dimension of the particle,as illus-trated in Fig.1.3.1
12、.5 thicknessminimum dimension of particle.It is themaximum dimension perpendicular to the length and width asillustrated in Fig.1.3.1.6 widthintermediate dimension of the particle.It is themaximum dimension in the plane perpendicular to the length1This test method is under the jurisdiction of ASTM C
13、ommittee D04 on Roadand Paving Materials and is the direct responsibility of Subcommittee D04.51 onAggregate Tests.Current edition approved Nov.1,2019.Published November 2019.Originallyapproved in 1989.Last previous edition approved in 2010 as D4791 10,whichwas withdrawn February 2019 and reinstated
14、 in November 2019.DOI:10.1520/D4791-19.2For 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.Copyright ASTM Internationa
15、l,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.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 Re
16、commendations issued by the World Trade Organization Technical Barriers to Trade(TBT)Committee.1 and thickness.The width dimensions is greater than or equal tothe thickness as illustrated in Fig.1.4.Summary of Test Method4.1 Individual particles of aggregate of specific sieve sizesare measured to determine the ratios of width to thickness,length to width,or length to thickness.5.Significance and Use5.1 The particles shape of course aggregates influences theproperties of some construction materia
