1、Designation: D 448 08Standard Classification forSizes of Aggregate for Road and Bridge Construction1This standard is issued under the fixed designation D 448; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last revisio
2、n. 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 Department of Defense.1. Scope1.1 This classification defines aggregate size number
3、 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 The values stated in SI units are to be regarded as thestandard. The values given in parentheses are for inf
4、ormationonly.1.3 The text of this classification references notes andfootnotes which provide explanatory material. These notes andfootnotes (excluding those in tables and figures) shall not beconsidered as requirements of the classification.2. Referenced Documents2.1 ASTM Standards:2C 136 Test Metho
5、d for Sieve Analysis of Fine and CoarseAggregatesD8 Terminology Relating to Materials for Roads and Pave-mentsD75 Practice for Sampling AggregatesE11 Specification for Wire Cloth and Sieves for TestingPurposes3. Terminology3.1 Definition of terms, see Terminology D8.4. Significance and Use4.1 Some c
6、ontract documents specify certain aggregatesizes 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 aggr
7、egate described in this clas-sification 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
8、 require-ments prescribed in Table 1 for 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 ran
9、ges shown in Table 1. Aggre-gate shall be sampled in accordance with Practice D75andtested for grading by Test Method C 136.1This classification is under the jurisdiction of ASTM Committee D04 on Roadand Paving Materials and is the direct responsibility of Subcommittee D04.50 onAggregate Specificati
10、ons.Current edition approved July 1, 2008. Published July 2008. Originally approvedin 1937. Last previous edition approved in 2003 as D 448 03a.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards v
11、olume information, refer to the standards Document Summary page onthe ASTM website.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.TABLE1StandardSizesofProcessedAggregateSizeNumberNominalSize,SquareOpeningsAmountsFinerthanEachLaborat
12、orySieve(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.)10090to100.25to60.0to15.0to5.2
13、63to37.5-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.toNo.
14、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).10090to100.20to550
15、to100to5.6819.0to2.36-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).10090to10020to555to300to100to
16、5.94.75to1.18-mm(No.4toNo.16).10085to10010to400to100to5.104.75-mm(No.4to0A).10085to100.10to30AScreenings.D4480828. Keywords8.1 aggregate standard size; coarse aggregate; screeningsASTM International takes no position respecting the validity of any patent rights asserted in connection with any item m
17、entionedin 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 technical committ
18、ee 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 consideration at a meet
19、ing 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 Harbor Drive, P
20、O 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).D448083
