1、Designation: D 2489 02Standard Practice forEstimating Degree of Particle Coating of Bituminous-Aggregate Mixtures1This standard is issued under the fixed designation D 2489; 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 (e) indicates an editorial change since the last revision or reapproval.1. Scope *1.1 This practice provides an estimate of the degree ofparticle coating in a bituminous-aggregate mixture on the bas
3、isof the percentage of coarse particles classified as beingcompletely coated.1.2 The values stated in SI units are regarded as beingstandard.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
4、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:D 8 Terminology Relating to Materials for Roads and Pave-ments2D 979 Practice for Sampling Bituminous Paving Mixtures2D 995 Specific
5、ation for Mixing Plants for Hot-Mixed, Hot-Laid Bituminous Paving Mixtures2D 3515 Specification for Hot-Mixed, Hot-Laid BituminousPaving Mixtures2D 3665 Practice for Random Sampling of ConstructionMaterials2D 4215 Specification for Cold-Mixed, Cold-Laid Bitumi-nous Paving Mixtures2E 11 Specification
6、 for Wire Cloth and Sieves for TestingPurposes33. Terminology3.1 For definitions of terms, see Terminology D 8.3.2 For 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 particle
7、s after varying mixing times is usedto establish the least mixing time required to produce satisfac-tory coating for 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 proc
8、edure is used with hot-mixed, hot-laid bitumi-nous paving mixtures such as specified in Specification D 3515or with cold-mixed, cold-laid bituminous paving mixtures suchas specified in Specification D 4215.NOTE 1Even when a paving mixture complies with the “percent ofcoated particles” that may be sp
9、ecified, there is no assurance that theasphalt cement is uniformly distributed throughout the mixture.5. Apparatus5.1 Sieves, 9.5 mm (38 in.) and 4.75 mm (No. 4). The sievesshall conform to Specification E 11.5.2 Stopwatch, for checking actual mixing time of batchplants.5.3 Thermometer, range at lea
10、st from 10C (50F) to 204C(400F).5.4 Sample Shovel.5.5 Sample Trays.6. Sampling6.1 Batch 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
11、lb!/pug mill output, kg/s lb/s!(1)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
12、 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 acco
13、rdance with Practice D 3665 and sampled in1This practice is under the jurisdiction of ASTM Committee D04 on Road andPaving Materials and is the direct responsibility of Subcommittee D04.23 onPlant-Mixed Bituminous Surfaces and Bases.Current edition approved July 10, 2002. Published October 2002. Ori
14、ginallypublished as D 2489 66 T. Last previous edition D 2489 00.2Annual Book of ASTM Standards, Vol 04.03.3Annual Book of ASTM Standards, Vol 14.02.1*A Summary of Changes section appears at the end of this standard.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken,
15、 PA 19428-2959, United States.accordance 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 still hot on
16、 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
17、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
18、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
19、al number of particles!(2)9. Keywords9.1 bituminous-aggregate mixtures; bituminous paving mix-tures; particle coatingSUMMARY OF CHANGESThis section identifies the location of changes to this standard that have been incorporated since the last issue,D 2489-00. Committee D04 has highlighted those chan
20、ges that affect the technical interpretation or use of thisstandard.(1) Revised pargraph 4.1.(2) Deleted paragraph 4.3, and replaced it with Note 1.(3) Added new paragraph 6.6.ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item menti
21、onedin 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 committee a
22、nd 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 meeting
23、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, PO Bo
24、x 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).D2489022
