1、Designation: D4887/D4887M 11Standard Practice forPreparation of Viscosity Blends for Hot Recycled AsphaltMaterials1This standard is issued under the fixed designation D4887/D4887M; 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 covers the procedure for preparation of hotrecycled bituminous blends for testing in the labor
3、atory. 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/TFO), com
4、position 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 D2172 and Test MethodD1856 (this practice may be modified by using a rotaryevaporat
5、or which is extensively evaluated in the minutes of the18th Pacific Coast Conference on Asphalt Specifications2)orany other acceptable test method.1.4 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 e
6、quivalents; therefore, eachsystem shall be used independently of the other. Combiningvalues from the two systems may result in non-conformancewith the standard.1.5 This standard does not purport to address all of thesafety concerns, if any, associated with its use. It is theresponsibility of the use
7、r 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:3D1856 Test Method for Recovery of Asphalt From Solutionby Abson MethodD2171 Test Method for Viscosity of Asphalt
8、s by VacuumCapillary ViscometerD2172 Test Methods for Quantitative Extraction of Bitu-men From Bituminous Paving MixturesD3381 Specification for Viscosity-Graded Asphalt Cementfor Use in Pavement ConstructionD6373 Specification for Performance Graded AsphaltBinderD6816 Practice for Determining Low-T
9、emperature Perfor-mance Grade (PG) of Asphalt Binders4D7175 Test Method for Determining the Rheological Prop-erties of Asphalt Binder Using a Dynamic Shear Rheom-eter3. Summary of Practice3.1 This specification covers the use of a viscosity blendingchart shown in Fig. 1 or by a Performance Grade (PG
10、)temperature blending chart shown in Fig. 2 to determine thepercentage of a recycling agent, rejuvenating agent orpavinggrade- asphalt (hereafter referred to as virgin modifier)required to meet the target viscosity or PG temperature. Theblending chart based on viscosity is based upon results fromD21
11、71 compared to the limits of D3381. The PG blendingchart is based upon the results from D6816 and D7175 whichare compared to the limits of D6373. The procedure consists ofdetermining the asphalt binder grade of reclaimed asphaltbinder (hereafter referred to as RAM binder), estimating theblend by gra
12、phical methods and preparing a blend of virginmodifier and the RAM binder in the laboratory. The measuredproperties of the blend are compared to the target values. If theblend properties do not meet the requirements and are notwithin the limits of Specification D3381 or D6373, anothertrial blend is
13、prepared using adjusted proportions of the sameor an alternate virgin modifier, or both, and the RAM binder. Abatch blend larger than the trial blend can then be preparedafter the target viscosity is achieved to facilitate additionaltests.1This practice is under the jurisdiction of ASTM Committee D0
14、4 on Road andPaving Materials and is the direct responsibility of Subcommittee D04.25 onAnalysis of Bituminous Mixtures.Current edition approved June 1, 2011. Published June 2011. Originallyapproved in 1989. Last previous edition approved in 2003 as D4887 99(2003).DOI: 10.1520/D4887_D4887M-11.2Aspha
15、lt Recovery Subcommittee Report, San Francisco, CA, May 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 web
16、site.4Withdrawn. The last approved version of this historical standard is referencedon www.astm.org.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.NOTE 1Calculations using ordinate viscosity (h) values (scales A and B) can be simpli
17、fied by using loglog (100 3hAor hB(Pas) such thatordinates and abscisca axes become linear.FIG. 1 Percent RAM Binder Allowed based on ViscosityD4887/D4887M 112NOTE 1It is recognized that Test Method D2171 requires 20 mL(minimum) of asphalt sample; however, due to enormous resourcesinvolved in extrac
18、tion and recovery, plus conducting a number ofiterations, a 10.0 6 0.1-g (minimum) sample is suggested to be adequatefor this practice. The accuracy of Test Method D2171 is not significantlyaffected by the change in sample size.NOTE 2How to Use Figure 1:(1) Plot high viscosity virgin modifiers visco
19、sity at 60C (140F) on leftordinate (A).(2) Plot RAM binder viscosity at 60C (140F) on right ordinate (B).(3) Connect points A and B with a straight line.(4) Draw a horizontal line through the target (blend) viscosity intersectingthe component viscosity line (AB).(5) Repeat steps 2 through 4 to form
20、line BD (binder viscosity not shownFIG. 2 Percent RAM Binder Allowed based on PG TemperaturesD4887/D4887M 113for low viscosity virgin modifier) for another candidate virgin modifier.(6) The projections of points E and F yield estimates of percent RAMbinder allowed to meet the target blend viscosity.
21、(7) The estimate in step 6 can be scaled back and forth to establish theexact blend that will produce the desired viscosity or other target propertywithin the limits of the test material.NOTE 3How to Use Figure 2:Procedure to determine the allowable percent RAM binder to reach atarget binder PG.(1)
22、Determine target binder PG high, intermediate and low temperatures.(2) Plot virgin modifier high PG temperature on left ordinate (A)(3) Plot RAM binder high PG temperature on right ordinate (B)(4) Connect points A and B with a straight line.(5) Draw a horizontal line through the target (blend) high
23、PG temperatureintersecting the component high PG temperature through line (AB).(6) Plot virgin modifier intermediate PG temperature on left ordinate (C)(7) Plot RAM binder intermediate PG temperature on right ordinate (D)(8) Connect points C and D with a straight line.(9) Draw a horizontal line thro
24、ugh the target (blend) intermediate PGtemperature intersecting the component intermediate PG temperaturethrough line (CD).(10) Plot virgin modifier low PG temperature on left ordinate (E)(11) Plot RAM binder low PG temperature on right ordinate (F)(12) Connect points E and F with a straight line.(13
25、) Draw a horizontal line through the target (blend) low PG temperatureintersecting the component low PG temperature through line (EF).(14) The projections of points G and H yield estimates of the allowablepercent RAM binder that may be used to meet the target blend PG.4. Significance and Use4.1 A st
26、andard procedure for blend preparation is essentialto ensure material quality, 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 agen
27、t or paving-grade-asphalt in appropriate proportions in accordance with 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.NOTE 4For ease
28、 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 and weighing the desired quantities with relativeease. Weighing should be executed
29、 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 121C (200 to 250F) andcontinually stir by hand using a glass rod until the mate
30、rialbecomes 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 prescribed in Test MethodD2171. Repeat the procedure until the desired viscosity isac
31、hieved.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 every 10-min interval until themixture melts. After the material is thoroughly melte
32、d, keep itin the oven for another 30 min while stirring for 1 min at every5-min interval. Remove the batch blend sample from the ovenfor subsequent testing.NOTE 5Larger quantities of blended material may be prepared bycombining two or more 200.0 6 0.1-g batch blends. Alternatively, singlelarge batch
33、es may be made provided uniform mixing is achieved.6.4 The batch blend prepared in 6.3 can be divided 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
34、viscosity,7.1.2 The type of materials blended and the viscosity ofeach component material at 60C (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; RAM binder; re-claimed or recyc
35、led asphalt material (RAM); recycled asphalt;recycled bituminous materialASTM 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 o
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