ImageVerifierCode 换一换
格式:PDF , 页数:6 ,大小:381.43KB ,
资源ID:520797      下载积分:10000 积分
快捷下载
登录下载
邮箱/手机:
温馨提示:
如需开发票,请勿充值!快捷下载时,用户名和密码都是您填写的邮箱或者手机号,方便查询和重复下载(系统自动生成)。
如填写123,账号就是123,密码也是123。
特别说明:
请自助下载,系统不会自动发送文件的哦; 如果您已付费,想二次下载,请登录后访问:我的下载记录
支付方式: 支付宝扫码支付 微信扫码支付   
注意:如需开发票,请勿充值!
验证码:   换一换

加入VIP,免费下载
 

温馨提示:由于个人手机设置不同,如果发现不能下载,请复制以下地址【http://www.mydoc123.com/d-520797.html】到电脑端继续下载(重复下载不扣费)。

已注册用户请登录:
账号:
密码:
验证码:   换一换
  忘记密码?
三方登录: 微信登录  

下载须知

1: 本站所有资源如无特殊说明,都需要本地电脑安装OFFICE2007和PDF阅读器。
2: 试题试卷类文档,如果标题没有明确说明有答案则都视为没有答案,请知晓。
3: 文件的所有权益归上传用户所有。
4. 未经权益所有人同意不得将文件中的内容挪作商业或盈利用途。
5. 本站仅提供交流平台,并不能对任何下载内容负责。
6. 下载文件中如有侵权或不适当内容,请与我们联系,我们立即纠正。
7. 本站不保证下载资源的准确性、安全性和完整性, 同时也不承担用户因使用这些下载资源对自己和他人造成任何形式的伤害或损失。

版权提示 | 免责声明

本文(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)为本站会员(explodesoak291)主动上传,麦多课文库仅提供信息存储空间,仅对用户上传内容的表现方式做保护处理,对上载内容本身不做任何修改或编辑。 若此文所含内容侵犯了您的版权或隐私,请立即通知麦多课文库(发送邮件至master@mydoc123.com或直接QQ联系客服),我们立即给予删除!

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

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

19、to be separated during the procedure. In this case,percent fractured particles is determined on each portion; anda weighted average percentage of fractured particles is calcu-lated based on the mass of each of the portions to reflect thetotal percentage of fractured particles in the entire sample.8.

20、 Procedure8.1 Wash the sample over the sieve designated for determi-nation of fractured particles to remove any remaining finematerial, and dry to constant mass. Determine the mass of thetest sample, and any subsequent determinations of mass, to thenearest 0.1 % of the original dry sample mass.8.2 S

21、pread the dried test sample on a clean flat surface largeenough to permit careful inspection of each particle. To verifythat a particle meets the fracture criteria, hold the aggregateparticle so that the face is viewed directly. If the faceconstitutes at least one quarter of the maximum cross-sectio

22、nalarea of the rock particle, consider it a fractured face.8.3 Using the spatula or similar tool separate into twocategories: (1) fractured particles based on whether the particlehas the required number of fractured faces, and (2) particles notmeeting the specified criteria. Use Figs. 2-7 to aid in

23、thisdetermination. Be aware that some of the particles in Figs. 2-4do show more than one fractured face. If the required numberof fractured faces is not given in the applicable specifications,the determination will be made on the basis of a minimum ofone fractured face.8.4 Determine the mass or coun

24、t of particles in the fracturedparticle category and the mass or count of the particles notmeeting the specified fracture criteria. Use mass to calculatepercent fractured particles unless percentage by particle countis specified.8.5 If more than one number of fractured faces is specified(for example

25、, 70 % with one or more fractured faces and 40 %FIG. 1 Schematic of a Fractured Particle with One Fractured FaceD5821 132with two or more fractured faces), repeat the procedure on thesame sample for each requirement.9. Report9.1 Report the mass percentage or count percentage ofparticles with the spe

26、cified number(s) of fractured faces to thenearest 1 % in accordance with the following:P 5 F/F1N!# 3100 (1)where:P = percentage of particles with the specified number offractured faces,F = mass or count of fractured particles with at least thespecified number of fractured faces, andN = mass or count

27、 of particles in the non-fractured categorynot meeting the fractured particle criteria.9.2 Report the specified fracture criteria against which thesample was evaluated.9.3 Report the total mass in grams of the coarse aggregatesample tested.9.4 Report the sieve on which the test sample was retainedat

28、 the start of the test.9.5 Report whether the percentage of fractured particles wasdetermined by mass or by particle count.10. Precision and Bias10.1 PrecisionThe Ontario Ministry of Transportationreported that in a formal study of 34 well-trained observers oftwo samples of partly-fractured gravel (

29、proportion of fracturedparticles = 76 %) the average standard deviation was found tobe 5.2 %. Therefore, the difference in results between twowell-trained observers, on samples of the same material shouldnot exceed 14.7 % of their average, nineteen times in twenty.NOTE 1When a mixture of trained and

30、 untrained observers conductedthis test, the average multi-operator standard deviation increased to about7.6 %.FIG. 2 Fractured Particle (Sharp Edges, Rough Surfaces)FIG. 3 Fractured Particle (Sharp Edges, Smooth Surfaces)D5821 13310.2 BiasThis test method has no bias because the valuesdetermined ca

31、n be defined only in terms of the test method.11. Keywords11.1 aggregate; crushed aggregate; crushed gravel; crushedparticles; fractured faces; fractured particlesFIG. 4 a) Fractured Particle (Round Edges, Rough Surfaces)FIG. 4 b) Fractured Particle (Round Edges, Rough Surfaces) (continued)FIG. 4 c)

32、 Fractured Particle (Round Edges, Rough Surfaces) (continued)D5821 134FIG. 5 Fractured Particle (Center) Flanked by Two Non-Fractured Particles (Chipped Only)FIG. 6 Non-Fractured Particle (Round Edges, Smooth Surfaces)D5821 135ASTM International takes no position respecting the validity of any paten

33、t rights asserted in connection with any item mentionedin this standard. Users of this standard are expressly advised that determination of the validity of any such patent rights, and the riskof infringement of such rights, are entirely their own responsibility.This standard is subject to revision a

34、t any time by the responsible technical committee and must be reviewed every five years andif not revised, either reapproved or withdrawn. Your comments are invited either for revision of this standard or for additional standardsand should be addressed to ASTM International Headquarters. Your commen

35、ts will receive careful consideration at a meeting of theresponsible technical committee, which you may attend. If you feel that your comments have not received a fair hearing you shouldmake your views known to the ASTM Committee on Standards, at the address shown below.This standard is copyrighted

36、by ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959,United States. Individual reprints (single or multiple copies) of this standard may be obtained by contacting ASTM at the aboveaddress or at 610-832-9585 (phone), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org). Permission rights to photocopy the standard may also be secured from the ASTM website (www.astm.org/COPYRIGHT/).FIG. 7 Non-Fractured Particle (Rounded Particles, Smooth Surfaces)D5821 136

copyright@ 2008-2019 麦多课文库(www.mydoc123.com)网站版权所有
备案/许可证编号:苏ICP备17064731号-1