1、Designation: D2489/D2489M 08D2489/D2489M 16Standard Practice for Test Method forEstimating Degree of Particle Coating of Bituminous-AggregateAsphalt Mixtures1This standard is issued under the fixed designation D2489/D2489M; the number immediately following the designation indicates theyear of origin
2、al 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 practice provides an estimate of the degree of particle coat
3、ing in a bituminous-aggregate mixture on the basis of thepercentage of coarse particles classified as being completely coated.1.2 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in eachsystem may not be exact equivalents; therefor
4、e, each system shall be used independently of the other. Combining values from thetwo systems may result in non-conformance with the standard.1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibilityof the user of this standar
5、d to establish appropriate safety and health practices and determine the applicability of regulatorylimitations prior to use.2. Referenced Documents2.1 ASTM Standards:2D8 Terminology Relating to Materials for Roads and PavementsD979 Practice for Sampling Bituminous Paving MixturesD995 Specification
6、for Mixing Plants for Hot-Mixed, Hot-Laid Bituminous Paving Mixtures (Withdrawn 2009)3D3665 Practice for Random Sampling of Construction MaterialsD4215 Specification for Cold-Mixed, Cold-Laid Bituminous Paving MixturesE11 Specification for Woven Wire Test Sieve Cloth and Test Sieves3. Terminology3.1
7、 For definitions of terms, see Terminology D8.3.2 For descriptions of mixing plant terms, see Mixing Plants, Specification D995.4. Significance and Use4.1 The procedure in this practice for estimating the percentage of coated particles after varying mixing times is used to establishthe least mixing
8、time required to produce satisfactory coating for a given set of conditions. This procedure can also be used tosample cold mixtures from stockpiles to determine that satisfactory coating has been retained in the stockpile.4.2 This procedure is used with hot-mixed, hot-laid bituminous paving mixtures
9、 or with cold-mixed, cold-laid bituminouspaving mixtures such as specified in Specification D4215.NOTE 1Even when a paving mixture complies with the “percent of coated particles” that may be specified, there is no assurance that the asphaltcement is uniformly distributed throughout the mixture.4.3 T
10、his practice should not be used for acceptance/rejection by owner agencies.1 This practice test method is under the jurisdiction of ASTM Committee D04 on Road and Paving Materials and is the direct responsibility of Subcommittee D04.23 onPlant-Mixed BituminousAsphalt Surfaces and Bases.Current editi
11、on approved Dec. 1, 2008Dec. 1, 2016. Published December 2008December 2016. Originally approved in 1966. Last previous edition approved in 20022008as D2489 02.D2489/D2489M 08. DOI: 10.1520/D2489_D2489M-08.10.1520/D2489_D2489M-16.2 For referencedASTM standards, visit theASTM website, www.astm.org, or
12、 contactASTM Customer Service at serviceastm.org. For Annual Book of ASTM Standardsvolume information, refer to the standards Document Summary page on the ASTM website.3 The last approved version of this historical standard is referenced on www.astm.org.This document is not an ASTM standard and is i
13、ntended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Becauseit may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the cu
14、rrent versionof the standard as published by ASTM is to be considered the official document.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States15. Apparatus5.1 Sieves, 9.5 mm 38 in. and 4.75 mm No. 4. The sieves shall conform to Specifica
15、tion E11.5.2 Stopwatch, for checking actual mixing time of batch plants.5.3 Thermometer, range at least 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 established mixing time per batch (timed by a stopwatch).6.2 Continuous Mix
16、 PlantEstablish a mixing time by use of the following formula:mixing time5pug mill contents,kg lb#/pug mill output,kg/s lb/s# (1)6.3 Drum Mix PlantOperate the plant at a steady state condition for a period of time long enough to complete the sampling.6.4 Samples should be taken at the site of the bi
17、tuminous mixing plant immediately after discharge from the plant from threetruck loads selected at random in accordance with Practice D3665 and sampled in accordance with Practice D979. Approximately2.5 to 4.0 kg 5 to 8 lb is required to perform the procedure.6.5 If sampling truck loads is impractic
18、al, sample from the roadway before compaction starts at three locations selected atrandom in accordance with Practice D3665 and sampled in accordance with Practice D979.6.6 If sampling from a cold mixed stockpile, sample at three locations selected at random in accordance with Practice D3665and samp
19、led in accordance with Practice D979.7. Procedure7.1 Sieve each sample immediately while it is still hot on a 9.5-mm 38-in. sieve, or a 4.75-mm No. 4 sieve for material witha maximum 9.5-mm 38-in. size. Take a sample large enough to yield between 200 and 500 coarse particles retained on the 9.5-mm38
20、-in. or 4.75-mm No. 4 sieve. Do not overload the sieves. If necessary, sieve the sample in two or three operations. Reduceshaking to a minimum to prevent recoating of uncoated particles.7.2 Place particles on a clean surface in a one-particle layer and start count immediately.7.3 Very carefully exam
21、ine each particle under direct sunlight, fluorescent light, or similar light conditions. If even a tiny speckof uncoated stone is noted, classify the particle as “partially coated.” If completely coated, classify the particle as “completelycoated.”8. Report8.1 Report the estimated percentage of coat
22、ed particles as follows:estimated %of coated particles5100 (2)number of completely coated particles!/total number of particles!9. Keywords9.1 bituminous-aggregate mixtures; bituminous paving mixtures; particle coatingASTM International takes no position respecting the validity of any patent rights a
23、sserted in connection with any item mentionedin 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
24、 by the responsible technical committee 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 rec
25、eive careful consideration at a meeting 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 Int
26、ernational, 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 thro
27、ugh the ASTM website(www.astm.org). Permission rights to photocopy the standard may also be secured from the Copyright Clearance Center, 222Rosewood Drive, Danvers, MA 01923, Tel: (978) 646-2600; http:/ Scope1.1 This test method provides an estimate of the degree of particle coating in an asphalt-ag
28、gregate mixture on the basis of thepercentage of coarse particles classified as being completely coated.D2489/D2489M 1621.2 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in eachsystem may not be exact equivalents; therefore, eac
29、h system shall be used independently of the other. Combining values from thetwo systems may result in nonconformance with the standard.1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibilityof the user of this standard to es
30、tablish appropriate safety and health practices and determine the applicability of regulatorylimitations prior to use.2. Referenced Documents2.1 ASTM Standards:2D8 Terminology Relating to Materials for Roads and PavementsD979 Practice for Sampling Bituminous Paving MixturesD995 Specification for Mix
31、ing Plants for Hot-Mixed, Hot-Laid Bituminous Paving Mixtures (Withdrawn 2009)3D3665 Practice for Random Sampling of Construction MaterialsD4215 Specification for Cold-Mixed, Cold-Laid Bituminous Paving MixturesE11 Specification for Woven Wire Test Sieve Cloth and Test Sieves3. Terminology3.1 For de
32、finitions of terms, see Terminology D8.3.2 For descriptions of mixing plant terms, see Mixing Plants, Specification D995.4. Significance and Use4.1 The procedure in this test method for estimating the percentage of coated particles after varying mixing times is used toestablish the least mixing time
33、 required to produce satisfactory coating for a given set of conditions. This procedure can also beused to sample cold mixtures from stockpiles to determine that satisfactory coating has been retained in the stockpile.4.2 This procedure is used with asphalt mixtures or with cold-mixed, cold-laid asp
34、halt paving mixtures such as specified inSpecification D4215.NOTE 1Even when a paving mixture complies with the “percent of coated particles” that may be specified, there is no assurance that the asphaltcement is uniformly distributed throughout the mixture.4.3 This test method should not be used fo
35、r acceptance/rejection by owner agencies.5. Apparatus5.1 Sieves, 9.5 mm 38 in. and 4.75 mm No. 4. The sieves shall conform to Specification E11.5.2 Stopwatch, for checking actual mixing time of batch plants.5.3 Thermometer, range at least from 10 C 50 F to 204 C 400 F.5.4 Sample Shovel.5.5 Sample Tr
36、ays.6. Sampling6.1 Batch PlantPermit the plant to operate at an established mixing time per batch (timed by a stopwatch).6.2 Continuous Mix PlantEstablish a mixing time by use of the following formula:mixing time5pug mill contents,kg lb#/pug mill output,kg/s lb/s# (1)6.3 Drum Mix PlantOperate the pl
37、ant at a steady state condition for a period of time long enough to complete the sampling.6.4 Samples should be taken at the site of the asphalt mixing plant immediately after discharge from the plant from three truckloads selected at random in accordance with Practice D3665 and sampled in accordanc
38、e with Practice D979. Approximately 2.5to 4.0 kg 5 to 8 lb is required to perform the procedure.6.5 If sampling truck loads is impractical, sample from the roadway before compaction starts at three locations selected atrandom in accordance with Practice D3665 and sampled in accordance with Practice
39、D979.6.6 If sampling from a cold-mixed stockpile, sample at three locations selected at random in accordance with Practice D3665and sampled in accordance with Practice D979.7. Procedure7.1 Sieve each sample immediately while it is still hot on a 9.5-mm 38-in. sieve, or a 4.75-mm No. 4 sieve for mate
40、rial witha maximum 9.5-mm 38-in. size. Take a sample large enough to yield between 200 and 500 coarse particles retained on the 9.5-mmD2489/D2489M 16338-in. or 4.75-mm No. 4 sieve. Do not overload the sieves. If necessary, sieve the sample in two or three operations. Reduceshaking to a minimum to pr
41、event recoating of uncoated particles.7.2 Place particles on a clean surface in a one-particle layer and start count immediately.7.3 Very carefully examine each particle under direct sunlight, fluorescent light, or similar light conditions. If even a tiny speckof uncoated stone is noted, classify th
42、e particle as “partially coated.” If completely coated, classify the particle as “completelycoated.”8. Report8.1 Report the estimated percentage of coated particles as follows:estimated %of coated particles5number of completely (2)coated particles)/total number of particles!)31009. Precision and Bia
43、s9.1 It is not possible to specify the precision of the procedure in Test Method D2489/D2489M for measuring the estimateddegree of particle coating because remixing or shipping, or both, of the samples between or within labs will change the coatingof aggregates.10. Keywords10.1 asphalt mixtures; asp
44、halt paving mixtures; 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 advised that determination of the validity of any such patent rights, and the r
45、iskof 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, either reapproved or withdrawn.Your comments are invited either for revision of th
46、is 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. If you feel that your comments have not received a fair hearing you shouldmake
47、 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
48、 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). Permission rights to photocopy the standard may also be secured from the Copyright Clearance Center, 222Rosewood Drive, Danvers, MA 01923, Tel: (978) 646-2600; http:/ 164
