1、Designation: D 4887 99 (Reapproved 2003)Standard Practice forPreparation of Viscosity Blends for Hot RecycledBituminous Materials1This standard is issued under the fixed designation D 4887; the number immediately following the designation indicates the year oforiginal adoption or, in the case of rev
2、ision, the year 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. Scope1.1 This practice covers the procedure for preparation of hotrecycled bituminous blends for testing in
3、 the laboratory. Theprocedure involves an iterative trial blend process followed bythe preparation of batch blends.1.2 The batch blends can be used for extensive evaluationsuch as viscosity, penetration, ductility, aging properties (suchas Rolling Thin Film Oven or Thin-Film Oven tests, or both(RTFO
4、/TFO), composition analysis, solubility analysis, andother user-selected tests.1.3 This practice assumes that a representative reclaimedasphalt pavement (RAP) sample is extracted and the agedbinder recovered using Test Methods D 2172 and Test MethodD 1856 (this practice may be modified by using a ro
5、taryevaporator which is extensively evaluated in the minutes of the18th Pacific Coast Conference on Asphalt Specifications2)orany other acceptable test method.1.4 This standard does not purport to address all of thesafety concerns, if any, associated with its use. It is theresponsibility of the user
6、 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:3D 1856 Test Method for Recovery of Asphalt from Solutionby Abson MethodD 2171 Test Method for Viscosity of Asphal
7、ts by VacuumCapillary ViscometerD 2172 Test Methods for Quantitative Extraction of Bitu-men from Bituminous Paving MixturesD 3381 Specification for Viscosity-Graded Asphalt Cementfor Use in Pavement Construction3. Summary of Practice3.1 The percentage of a recycling agent or paving-grade-asphalt req
8、uired to meet a target viscosity is initially deter-mined on a weight basis by the use of a viscosity blend chartas illustrated in Fig. 1. A 10.0 6 0.1-g (minimum) trial blendconsisting of the recycling agent or paving grade asphalt andreclaimed RAP binder is prepared in the laboratory. Theviscosity
9、 of the trial blend at 60C (140F) is compared to thetarget viscosity. If the blend viscosity is not within the limits ofSpecification D 3381 about the target value, another trial blendis prepared using adjusted proportions of the same or analternate grade modifier, or both, and the RAP binder. A bat
10、chblend larger than the trial blend can then be prepared after thetarget viscosity is achieved to facilitate additional tests.NOTE 1It is recognized that Test Method D 2171 requires 20 mL(minimum) of asphalt sample; however, due to enormous resourcesinvolved in extraction and recovery, plus conducti
11、ng a number ofiterations, a 10.0 6 0.1-g (minimum) sample is suggested to be adequatefor this practice. The accuracy of Test Method D 2171 is not significantlyaffected by the change in sample size.4. Significance and Use4.1 A standard procedure for blend preparation is essentialto ensure material qu
12、ality, specification compliance, and pro-cedural uniformity.5. Apparatus5.1 Beakers, 50-mL, 600-mL capacity or other suitablecontainers.5.2 Hot plate.5.3 Glass stirring rod.6. Procedure6.1 Weigh the RAP binder and recycling agent or paving-grade-asphalt in appropriate proportions in accordance with
13、3.1in a 10.0 6 0.1-g specimen or larger for a trial blend. Preparethe 10.0 6 0.1-g trial blend in the 50-mL container whilepreparing a larger batch (if required) in the 600-mL containeror other suitable containers.1This practice is under the jurisdiction of ASTM Committee D04 on Road andPaving Mater
14、ials and is the direct responsibility of Subcommittee D04.25 onAnalysis of Bituminous Mixtures.Current edition approved Dec. 1, 2003. Published December 2003. Originallyapproved in 1989. Last previous edition approved in 1999 as D 4887 99.2Asphalt Recovery Subcommittee Report, San Francisco, CA, May
15、 1718,1983.3For 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.1Copyright ASTM International, 100 Barr Harbor Dri
16、ve, PO Box C700, West Conshohocken, PA 19428-2959, United States.NOTE 2For ease of handling during proportioning, the RAP binderand recycling agent or paving grade asphalt may be frozen (6 6 1F issuggested) for 1 to 2 h. Aromatic oils may not require freezing. The frozenstate facilitates chipping an
17、d weighing the desired quantities with relativeease. Weighing should be executed quickly because cold specimens mayattract moisture especially in humid environments that may result inbubbly action during heating.6.2 Place the container with the 10.0 6 0.1-g target blendsample on a hot plate at 93 to
18、 121C (200 to 250F) andcontinually stir by hand using a glass rod until the materialbecomes fluid. Place the container with the sample in an ovenat 135C (275F) for 10 min and stir for 30-s durations at5-min intervals. Transfer the sample to viscosity tubes forviscosity testing at 60C (140F) as presc
19、ribed in Test MethodD 2171. Repeat the procedure until the desired viscosity isachieved.6.3 Once the desired viscosity is achieved, prepare a batchblend sample. About 200 g is normally sufficient. Weigh in a600-mL container and place in a 135C (275F) oven and stir,using a glass rod, for 1 min at eve
20、ry 10-min interval until themixture melts. After the material is thoroughly melted, keep itin the oven for another 30 min while stirring for 1 min at everyNOTE 1How to Use the Chart:(1) Plot reclaimed asphalt viscosity 60C (140F) on left ordinate (A).(2) Plot recycling agent viscosity 60C (140F) on
21、right ordinate (B).(3) Connect points A and B with a straight line.(4) Draw a horizontal line through the target (blend) viscosity intersecting the component viscosity line (AB).(5) Repeat steps 2 through 4 to form line A C for another candidate recycling agent or paving-grade asphalt.(6) The projec
22、tions of points C and D yield estimates of percent recycling agent or paving-grade asphalt required to meet the target blend viscosity.(7) The estimate in step 6 can be scaled back and forth to establish the exact blend that will produce the desired viscosity or other target property withinthe limit
23、s of the test material.NOTE 2Calculations using ordinate viscosity (h) values (scales A and B) can be simplified by using loglog (100 3hAor hB(Pas) such that ordinatesand abscisca axes become linear.FIG. 1 Percent Recycling Agent Required Depends on ViscosityD 4887 99 (2003)25-min interval. Remove t
24、he batch blend sample from the ovenfor subsequent testing.NOTE 3Larger quantities of blended material may be prepared bycombining two or more 200.0 6 0.1-g batch blends. Alternatively, singlelarge batches may be made provided uniform mixing is achieved.6.4 The batch blend prepared in 6.3 can be divi
25、ded intosmaller quantities for physical or chemical tests to meet thevarious test requirements of the investigator.7. Report7.1 The report shall include the following information:7.1.1 The target blend viscosity,7.1.2 The type of materials blended and the viscosity ofeach component material at 60C (
26、140F),7.1.3 The proportions of the blended materials, and7.1.4 The properties of the batch blend if the latter is made.8. Keywords8.1 asphalt viscosity; binder viscosity; RAP binder; re-claimed asphalt pavement (RAP); recycled asphalt; recycledbituminous materialASTM International takes no position
27、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 riskof infringement of such rights, are entirely their own responsibility.Th
28、is 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 this standard or for additional standardsand should be addressed to ASTM Int
29、ernational 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 your views known to the ASTM Committee on Standards, at the address shown
30、 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 4887 99 (2003)3
