1、Designation: D448 12 (Reapproved 2017)Standard Classification forSizes of Aggregate for Road and Bridge Construction1This standard is issued under the fixed designation D448; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year
2、 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 classification defines
3、aggregate size number desig-nations and standard size ranges for mechanical sieve analysesof coarse aggregate and screenings for use in the constructionand maintenance of various types of highways and bridges.1.2 UnitsThe values stated in SI units are to be regardedas standard. No other units of mea
4、surement are included in thisstandard.NOTE 1Sieve size is identified by its standard designation in Speci-fication E11. The alternative designation given in parentheses is forinformation only and does not represent a different standard sieve size.1.3 The text of this classification references notes
5、andfootnotes which provide explanatory material. These notes andfootnotes (excluding those in tables and figures) shall not beconsidered as requirements of the classification.1.4 This international standard was developed in accor-dance with internationally recognized principles on standard-ization e
6、stablished in the Decision on Principles for 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 Test Method for Sieve Analysis of Fine and CoarseAggre
7、gatesD8 Terminology Relating to Materials for Roads and Pave-mentsD75 Practice for Sampling AggregatesE11 Specification for Woven Wire Test Sieve Cloth and TestSieves3. Terminology3.1 For definitions of terms, see Terminology D8.4. Significance and Use4.1 Some contract documents specify certain aggr
8、egatesizes for specific uses or may suggest one or more of thesesizes as appropriate for the preparation of various end-productmixtures. In some cases, closer limits on variability of theaggregate grading are required.5. Manufacture5.1 The standard sizes of aggregate described in this clas-sificatio
9、n are manufactured by means of any suitable processused to separate raw material into the desired size ranges.Production of standard sizes by blending two or more differentcomponents is permitted.6. Standard Sizes6.1 Standard aggregate sizes shall conform to the require-ments prescribed in Table 1 f
10、or the size number specified.Conformance shall be determined by means of laboratorysieves having square openings and conforming to SpecificationE11.7. Basis of Classification7.1 Classification of an aggregate is based upon the sizenumber designation and size ranges shown in Table 1. Aggre-gate shall
11、 be sampled in accordance with Practice D75 andtested for grading by Test Method C136.1This classification is under the jurisdiction of ASTM Committee D04 on Roadand Paving Materials and is the direct responsibility of Subcommittee D04.50 onAggregate Specifications.Current edition approved Oct. 1, 2
12、017. Published October 2017. Originallyapproved in 1937. Last previous edition approved in 2012 as D448 12. DOI:10.1520/D0448-12R17.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume inform
13、ation, 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 StatesThis international standard was developed in accordance with internationally recognized principles on standardizatio
14、n 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.1TABLE1StandardSizesofProcessedAggregateSizeNumberNominalSize,SquareOpeningsAmountsFinerthanEachLab
15、oratorySieve(SquareOpenings),masspercent100-mm(4-in.)90- mm(312-in.)75- mm(3-in.)63-mm(212-in.)50-mm(2-in.)37.5-mm(112-in.)25.0-mm(1-in.)19.0-mm(34-in.)12.5-mm(12-in.)9.5-mm(38-in.)4.75-mm(No.4)2.36-mm(No.8)1.18-mm(No.16)300-m(No.50)150-m(No. 100)190to37.5-mm(312to112-in.)10090to100.25to60.0to15.0to
16、5.263to37.5-mm(212to112-in.).10090to10035to700to15.0to5.2463to19.0-mm(212to34-in.).10090to100.25to60.0to100to5.350to25.0-mm(2to1-in.).10090to10035to700to15.0to5.35750to4.75-mm(2-in.toNo.4).10095to100.35to70.10to30.0to5.437.5to19.0-mm(112to34-in.).10090to10020to550to15.0to5.46737.5to4.75-mm(112-in.to
17、No.4).10095to100.35to70.10to300to5.525.0to12.5-mm.(1to12-in.).10090to10020to550to100to5.5625.0to9.5-mm(1to38-in.).10090to10040to8510to400to150to5.5725.0to4.75-mm(1-in.toNo.4).10095to100.25to60.0to100to5.619.0to9.5-mm(34to38-in.).10090to10020to550to150to5.6719.0to4.75-mm(34-in.toNo.4).10090to100.20to
18、550to100to5.6819.0to2.36-mm(34-in.toNo.8).10090to100.30to655to250to100to5.712.5to4.75-mm(12-in.toNo.4).10090to10040to700to150to5.7812.5to2.36-mm(12-in.toNo.8).10090to10040to755to250to100to5.89.5to2.36-mm(38-in.toNo.8).10085to10010to300to100to5.899.5to1.18-mm(38-in.toNo.16).10090to10020to555to300to10
19、0to5.94.75to1.18-mm(No.4toNo.16).10085to10010to400to100to5.104.75-mm(No.4to0A).10085to100.10to30AScreenings.D448 12 (2017)28. Keywords8.1 aggregate standard size; coarse aggregate; screeningsASTM International takes no position respecting the validity of any patent rights asserted in connection with
20、 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 at any time by the responsible techni
21、cal 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 comments will receive careful consideratio
22、n 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 by ASTM International, 100 Barr Harb
23、or 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 Copyright Clearance Center, 222Rosewood Drive, Danvers, MA 01923, Tel: (978) 646-2600; http:/ 12 (2017)3
