ASTM D5821-2013 8095 Standard Test Method for Determining the Percentage of Fractured Particles in Coarse Aggregate《测定粗集料中破裂颗粒百分比的标准试验方法》.pdf
《ASTM D5821-2013 8095 Standard Test Method for Determining the Percentage of Fractured Particles in Coarse Aggregate《测定粗集料中破裂颗粒百分比的标准试验方法》.pdf》由会员分享,可在线阅读,更多相关《ASTM D5821-2013 8095 Standard Test Method for Determining the Percentage of Fractured Particles in Coarse Aggregate《测定粗集料中破裂颗粒百分比的标准试验方法》.pdf(6页珍藏版)》请在麦多课文档分享上搜索。
1、Designation: D5821 13Standard 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 o
2、f last 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 co
3、nsists of fractured 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
4、 is theresponsibility 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 fo
5、r Reducing Samples 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
6、an aggregate particle 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-sectio
7、nal area) of the particle (this 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
8、 requirements relating topercentage 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 an
9、d to provide increased frictionand texture 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 f
10、ractured particle, and they also differ 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
11、 towithin 0.1 % of the test sample mass at 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 sorting
12、aggregate particles.6. Sampling6.1 Sample the 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. Publi
13、shed January 2014. Originallyapproved in 1995. Last 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
14、, refer to the standards Document Summary page onthe ASTM website.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States17. Sample Preparation7.1 Dry the sample sufficiently to obtain a clean separationof fine and coarse material in the siev
15、ing operation. Sieve thesample over the 4.75-mm (No. 4) sieve, or 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
16、of the test sample shall be at least largeenough so that the largest 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 (
17、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(34 in.) or larger, where the fracture particle content is to bedetermined for
18、 material retained on the 4.75-mm (No. 4) orsmaller sieve, the test sample may be separated on the 9.5-mm(38-in.) sieve. The portion passing the 9.5-mm (38-in.) sievemay then be further reduced, in accordance with Practice C702,to a minimum of 200 g (0.5 lb). This will reduce the number ofparticles
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