1、Designation:D2489/D2489M08Standard Practice forEstimating Degree of Particle Coating of Bituminous-Aggregate Mixtures1This standard is issued under the fixed designation D2489/D2489M;the number immediately following the designation indicates theyear of original adoption or,in the case of revision,th
2、e 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 mixture on the basi
3、sof 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 independently of the other
4、.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 health practices and d
5、etermine the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2D8 Terminology Relating to Materials for Roads and Pave-mentsD979 Practice for Sampling Bituminous Paving MixturesD995 Specification for Mixing Plants for Hot-Mixed,Hot-Laid Bituminous Paving
6、 Mixtures(Withdrawn 2009)3D3665 Practice for Random Sampling of Construction Ma-terialsD4215 Specification for Cold-Mixed,Cold-Laid BituminousPaving MixturesE11 Specification for Woven Wire Test Sieve Cloth and TestSieves3.Terminology3.1 For definitions of terms,see Terminology D8.3.2 For descriptio
7、ns of mixing plant terms,see MixingPlants,Specification D995.4.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 a given set of c
8、onditions.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 mixtures such as speci
9、fied in Specification D4215.NOTE1Even 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/rejection by owner agencies.
10、5.Apparatus5.1 Sieves,9.5 mm 38in.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 PlantPermit the plant to operate
11、 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 time5 pug mill contents,kglb#/pug mill output,kg/slb/s#(1)1This practice is under the jurisdiction of ASTM Committee D04 on Road andPaving Materials a
12、nd 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 D2489 02.DOI:10.1520/D2489_D2489M-08.2For referenced ASTM standards,visi
13、t 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.3The last approved version of this historical standard is referenced onwww.astm.org.Copyright ASTM In
14、ternational,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 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
15、 discharge from the plant fromthree truck loads selected at random in accordance withPractice D3665 and sampled in accordance with PracticeD979.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 compactio
16、n starts at three locations selected atrandom in accordance with Practice D3665 and sampled inaccordance with Practice D979.6.6 If sampling from a cold mixed stockpile,sample at threelocations selected at random in accordance with PracticeD3665 and sampled in accordance with Practice D979.7.Procedure7.1 Sieve each sample immediately while it is still 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
