1、Designation:D582113Standard Test Method forDetermining the Percentage of Fractured Particles in CoarseAggregate1This standard is issued under the fixed designation D5821;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of las
2、t revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This test method covers the determination of thepercentage,by mass or by count,of a coarse aggregate samplethat consists of fr
3、actured particles meeting specified require-ments.1.2 The values stated in SI units are to be regarded as thestandard.The values in parentheses are provided for informa-tion only.1.3 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsib
4、ility 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 Standards:2C136 Test Method for Sieve Analysis of Fine and CoarseAggregatesC702 Practice for Reducing Sample
5、s ofAggregate to TestingSizeD8 Terminology Relating to Materials for Roads and Pave-mentsD75 Practice for Sampling AggregatesE11 Specification for Woven Wire Test Sieve Cloth and TestSieves3.Terminology3.1 Definitions:3.1.1 fractured face,nan angular,rough,or broken sur-face of an aggregate particle
6、 created by crushing,by otherartificial means,or by nature(see Terminology D8).3.1.1.1 Discussionfor this standard,a face will be consid-ered a“fractured face”only if it has a projected area at least aslarge as one quarter of the maximum projected area(maximumcross-sectional area)of the particle(thi
7、s excludes small nicks,see Fig.1)and the face has sharp or slightly blunt edges.3.1.2 fractured particle,na particle of aggregate having atleast the minimum number of fractured faces specified(usuallyone or two).4.Significance and Use4.1 Some specifications contain requirements relating topercentage
8、 of fractured particles in coarse aggregates.Onepurpose of such requirements is to maximize shear strength byincreasing inter-particle friction in either bound or unboundaggregate mixtures.Another purpose is to provide stability forsurface treatment aggregates and to provide increased frictionand te
9、xture for aggregates used in pavement surface courses.This test method provides a standard procedure for determiningthe acceptability of coarse aggregate with respect to suchrequirements.4.2 Specifications differ as to the number of fractured facesrequired on a fractured particle,and they also diffe
10、r as towhether percentage by mass or percentage by particle countshall be used.If the specification does not specify,use thecriterion of at least one fractured face and calculate percentageby mass.5.Apparatus5.1 BalanceA balance or scale accurate and readable towithin 0.1%of the test sample mass at
11、any point within therange of use.5.2 SievesSieves conforming to Specification E11.5.3 SplitterA sample splitter suitable for dividing fieldsamples into test portion sizes in accordance with PracticeC702.5.4 SpatulaA spatula or similar tool to aid in sortingaggregate particles.6.Sampling6.1 Sample th
12、e aggregate in accordance with Practice D75.1This test method is under the jurisdiction of ASTM Committee D04 on Roadand Paving Materials and is the direct responsibility of Subcommittee D04.51 onAggregate Tests.Current edition approved Dec.1,2013.Published January 2014.Originallyapproved in 1995.La
13、st previous edition approved in 2006 as D5821 01(2006).DOI:10.1520/D5821-13.2For 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 AST
14、M website.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 7.Sample Preparation7.1 Dry the sample sufficiently to obtain a clean separationof fine and coarse material in the sieving operation.Sieve thesample over the 4.75-mm(No.4)sieve,or
15、other specified sievefor retaining material for this test,in accordance with TestMethod C136 and then reduce the portion retained on the sieveusing a splitter in accordance with Practice C702 to appropriatesize for test.7.2 The mass of the test sample shall be at least largeenough so that the larges
16、t particle is not more than 1%of thesample mass;or the test sample shall be at least as large asindicated below,whichever is smaller:Nominal Maximum SizeSquareOpenings,mm(in.)Minimum Test SampleMass,g(Approx.lb)9.5(38)200(0.5)12.5(12)500(1)19.0(34)1500(3)25.0(1)3000(6.5)37.5(112)7500(16.5)50.0(2)15 000(33)63.0(212)30 000(66)75.0(3)60 000(132)90.0(312)90 000(198)7.3 For aggregate with a nominal maximum size of 19.0 mm(34in.)or larger,where the fracture particle content is to bedetermined for mate
