ASTM_D_2489_-_D_2489M_-_16.pdf

Designation:D2489/D2489M16Standard Test Method forEstimating Degree of Particle Coating of Asphalt 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,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 test method provides an estimate of the degree ofparticle coating in an asphalt-aggregate mixture on the basis ofthe percentage of coarse particles classified as being com-pletely 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.Combiningvalues from the two systems may result in nonconformancewith 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 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-mentsD979 Practice for Sampling Bituminous Paving MixturesD995 Specification for Mixing Plants for Hot-Mixed,Hot-Laid Bituminous Paving Mixtures(Withdrawn 2009)3D3665 Practice for Random Sampling of Construction Ma-terialsD4215 Specification for Cold-Mixed,Cold-Laid BituminousPaving MixturesE11 Specification for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 descriptions of mixing plant terms,see MixingPlants,Specification D995.4.Significance and Use4.1 The procedure in this test method for estimating thepercentage of coated particles after varying mixing times isused to establish the least mixing time required to producesatisfactory coating for a given set of conditions.This proce-dure can also be used to sample cold mixtures from stockpilesto determine that satisfactory coating has been retained in thestockpile.4.2 This procedure is used with asphalt mixtures or withcold-mixed,cold-laid asphalt paving mixtures such as specifiedin 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 test method should not be used for acceptance/rejection by owner agencies.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 10 C 50 F to204 C 400 F.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 time5 pug mill contents,kglb#/pug mill output,kg/slb/s#(1)6.3 Drum Mix PlantOperate the plant at a steady statecondition for a period of time long enough to complete thesampling.1This test method is under the jurisdiction of ASTM Committee D04 on Roadand Paving Materials and is the direct responsibility of Subcommittee D04.23 onPlant-Mixed Asphalt Surfaces and Bases.Current edition approved Dec.1,2016.Published December 2016.Originallyapproved in 1966.Last previous edition approved in 2008 as D2489/D2489M 08.DOI:10.1520/D2489_D2489M-16.2For referenced ASTM 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.3The last approved version of this historical standard is referenced onwww.astm.org.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 6.4 Samples should be taken at the site of the asphalt mixingplant immediately after discharge from the plant from threetruck loads selected at random in accordance with PracticeD3665 and sampled in accordance with Practice D979.Ap-proximately 2.5 to 4.0 kg 5 to 8 lb is required to perform theprocedure.6.5 If sampling truck loads is impractical,sample from theroadway before compaction 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 500 coarse particles retaine