1、Designation: D 2489/D 2489M 08Standard Practice forEstimating Degree of Particle Coating of Bituminous-Aggregate Mixtures1This standard is issued under the fixed designation D 2489/D 2489M; the number immediately following the designation indicates theyear of original adoption or, in the case of rev
2、ision, the year of last revision. A number in parentheses indicates the year of lastreapproval. A superscript epsilon () indicates an editorial change since the last revision or reapproval.1. Scope1.1 This practice provides an estimate of the degree ofparticle coating in a bituminous-aggregate mixtu
3、re on the basisof the percentage of coarse particles classified as beingcompletely coated.1.2 The values stated in either SI units or inch-pound unitsare to be regarded separately as standard. The values stated ineach system may not be exact equivalents; therefore, eachsystem shall be used independe
4、ntly of the other. Combiningvalues from the two systems may result in non-conformancewith the standard.1.3 This standard does not purport to address all of thesafety concerns, if any, associated with its use. It is theresponsibility of the user of this standard to establish appro-priate safety and h
5、ealth practices and determine the applica-bility of regulatory limitations prior to use.2. Referenced Documents2.1 ASTM Standards:2D8 Terminology Relating to Materials for Roads and Pave-mentsD 979 Practice for Sampling Bituminous Paving MixturesD 995 Specification for Mixing Plants for Hot-Mixed, H
6、ot-Laid Bituminous Paving MixturesD 3665 Practice for Random Sampling of ConstructionMaterialsD 4215 Specification for Cold-Mixed, Cold-Laid Bitumi-nous Paving MixturesE11 Specification for Wire Cloth and Sieves for TestingPurposes3. Terminology3.1 For definitions of terms, see Terminology D8.3.2 Fo
7、r descriptions of mixing plant terms, see MixingPlants, Specification D 995.4. Significance and Use4.1 The procedure in this practice for estimating the per-centage of coated particles after varying mixing times is usedto establish the least mixing time required to produce satisfac-tory coating for
8、a given set of conditions. This procedure canalso be used to sample cold mixtures from stockpiles todetermine that satisfactory coating has been retained in thestockpile.4.2 This procedure is used with hot-mixed, hot-laid bitumi-nous paving mixtures or with cold-mixed, cold-laid bituminouspaving mix
9、tures such as specified in Specification D 4215.NOTE 1Even when a paving mixture complies with the “percent ofcoated particles” that may be specified, there is no assurance that theasphalt cement is uniformly distributed throughout the mixture.4.3 This practice should not be used for acceptance/reje
10、ction by owner agencies.5. Apparatus5.1 Sieves, 9.5 mm 38 in. and 4.75 mm No. 4. The sievesshall conform to Specification E11.5.2 Stopwatch, for checking actual mixing time of batchplants.5.3 Thermometer, range at least from 10C 50F to 204C400F.5.4 Sample Shovel.5.5 Sample Trays.6. Sampling6.1 Batch
11、 PlantPermit the plant to operate at an estab-lished mixing time per batch (timed by a stopwatch).6.2 Continuous Mix PlantEstablish a mixing time by useof the following formula:mixing time 5 pug mill contents, kg lb/pug mill output, kg/s lb/s(1)1This practice is under the jurisdiction of ASTM Commit
12、tee D04 on Road andPaving Materials and is the direct responsibility of Subcommittee D04.23 onPlant-Mixed Bituminous Surfaces and Bases.Current edition approved Dec. 1, 2008. Published December 2008. Originallyapproved in 1966. Last previous edition approved in 2002 as D 2489 02.2For referenced ASTM
13、 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 ASTM website.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohoc
14、ken, PA 19428-2959, United States.6.3 Drum Mix PlantOperate the plant at a steady statecondition for a period of time long enough to complete thesampling.6.4 Samples should be taken at the site of the bituminousmixing plant immediately after discharge from the plant fromthree truck loads selected at
15、 random in accordance withPractice D 3665 and sampled in accordance with PracticeD 979. Approximately 2.5 to 4.0 kg 5 to 8 lb is required toperform the procedure.6.5 If sampling truck loads is impractical, sample from theroadway before compaction starts at three locations selected atrandom in accord
16、ance with Practice D 3665 and sampled inaccordance with Practice D 979.6.6 If sampling from a cold mixed stockpile, sample at threelocations selected at random in accordance with PracticeD 3665 and sampled in accordance with Practice D 979.7. Procedure7.1 Sieve each sample immediately while it is st
17、ill hot on a9.5-mm 38-in. sieve, or a 4.75-mm No. 4 sieve for materialwith a maximum 9.5-mm 38-in. size. Take a sample largeenough to yield between 200 and 500 coarse particles retainedon the 9.5-mm 38-in. or 4.75-mm No. 4 sieve. Do notoverload the sieves. If necessary, sieve the sample in two orthr
18、ee operations. Reduce shaking to a minimum to preventrecoating of uncoated particles.7.2 Place particles on a clean surface in a one-particle layerand start count immediately.7.3 Very carefully examine each particle under direct sun-light, fluorescent light, or similar light conditions. If even a ti
19、nyspeck of uncoated stone is noted, classify the particle as“partially coated.” If completely coated, classify the particle as“completely coated.”8. Report8.1 Report the estimated percentage of coated particles asfollows:estimated % of coated particles 5 100number of completely coated particles!/tot
20、al number of particles!(2)9. Keywords9.1 bituminous-aggregate mixtures; bituminous paving mix-tures; particle coatingASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin this standard. Users of this standard are expressly
21、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 committee and must be reviewed every five years andif not revised, eit
22、her 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 meeting of theresponsible technical committee, which you may attend
23、. 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, 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).D 2489/D 2489M 082
