1、Designation:D4887/D4887M11Standard 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,the yea
2、r 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 laboratory.Thep
3、rocedure 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),composition analysis
4、,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 rotaryevaporator which is extensivel
5、y 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 equivalents;therefore,ea
6、chsystem 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 user of this standard to establi
7、sh 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 Asphalts by VacuumCapillary Viscomete
8、rD2172 Test Methods for Quantitative Extraction of BitumenFrom Bituminous Paving MixturesD3381 Specification for Viscosity-Graded Asphalt Cementfor Use in Pavement ConstructionD6373 Specification for Performance Graded AsphaltBinderD6816 Practice for Determining Low-Temperature Perfor-mance Grade(PG
9、)of Asphalt BindersD7175 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)temperature blending chart shown in F
10、ig.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 fromD2171 compared to the limits of D3381.The PG b
11、lendingchart 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 graphical methods and preparing a blend of virginm
12、odifier and the RAM binder in the laboratory.The measuredproperties of the blend are compared to the target values.If the1This practice is under the jurisdiction of ASTM Committee D04 on Road andPaving Materials and is the direct responsibility of Subcommittee D04.25 onAnalysis of Asphalt Mixtures.C
13、urrent 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-11.2Asphalt Recovery Subcommittee Report,San Francisco,CA,May 1718,1983.3For referenced ASTM standards,visit the ASTM website,www.astm.
14、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.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 NOTE1Calculations u
15、sing ordinate viscosity()values(scalesAand B)can be simplified by using loglog(100 Aor B(Pas)such that ordinatesand abscisca axes become linear.FIG.1 Percent RAM Binder Allowed based on ViscosityD4887/D4887M 112 blend properties do not meet the requirements and are notwithin the limits of Specificat
16、ion D3381 or D6373,anothertrial blend is 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.FIG.2 Percent RAM Binder Allowed based on PG TemperaturesD4887/D4887M 113 NOTE1It is recognized that Test Method D2171 requires 20 mL(minimum)of asphalt sample;however,due to enormous resourcesinvolved in extraction and rec