ASTM_D_6847_-_02.pdf

Designation:D 6847 02Standard Test Method forQuantitative Extraction and Recovery of Asphalt Binderfrom Asphalt Mixtures1This provisional standard is issued under the fixed designation D 6847;the number immediately following the designation indicates theyear of original adoption.1.Scope1.1 This test method covers a procedure for the extractionand recovery of asphalt binder from asphalt mixturesbothHMA(hot mix asphalt)and RAP(reclaimed/recycled asphaltpavement)having a minimal effect on the physical propertiesof the asphalt binder recovered.It is primarily intended for usewhen the physical properties of the recovered asphalt are to bedetermined.It can also be used to determine the quantity ofasphalt binder in the HMA or RAP.Recovered aggregate maybe used for sieve analysis.This may also be accomplishedthrough Test Methods D 2172.1.2 The values stated in SI units are regarded as thestandard.Values in parentheses are for informational use.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.NOTE1It is suggested that agency and personnel performing this testmeet the requirements of Specification D 3666.2.Referenced Documents2.1 ASTM Standards:D 75 Practice for Sampling Aggregates2D 979 Practice for Sampling Bituminous Paving Mixtures2D 1461 Test Method for Moisture or Volatile Distillates inBituminous Paving Mixtures2D 2172 Test Methods for Quantitative Extraction of Bitu-men From Bituminous Paving Mixtures2D 2939 Test Methods for Emulsified Bitumens Used asProtective Coatings3D 3666 Specification for Minimum Requirements forAgen-cies Testing and Inspecting Road and Paving Materials2D 4753 Specification for Evaluating,Selecting,and Speci-fying Balances and Scales for Use in Testing Soil,Rock,and Related Construction Materials4D 5361 Practice for Sampling Compacted Bituminous Mix-tures for Laboratory Testing2D 5444 Test Method for Mechanical Size Analysis of Ex-tracted Aggregate2E 11 Specification for Wire Cloth and Sieves for TestingPurposes53.Summary of Test Method3.1 The asphalt mixture is repeatedly washed and filteredwith solvent in an extraction/filtration apparatus.Each filtrateis distilled under vacuum in a rotary evaporator with theasphalt remaining in the flask.After recovery of the finalfiltrate,the solution is concentrated to about 300 mL andcentrifuged to remove aggregate fines.The decanted solution isdistilled under vacuum to remove the extraction solvents.Nitrogen gas is introduced during the final phase of distillationto drive off any remaining traces of solvents.The quantity ofasphalt binder in the asphalt mixture is calculated(optional)and the recovered asphalt(distillation residue)sample issubjected to further physical testing as required.The recoveredaggregate can then be used for sieve analysis,if desired.4.Significance and Use4.1 This standard is used to extract and recover asphaltbinder from an asphalt mixture sample.The recovered mixturecomponents(asphalt binder and aggregates)can then besubjected to further physical tests.5.Apparatus5.1 Extraction VesselThe extraction vessel shall be adevice as shown in Fig.1,and shall have a 130-mm long pieceof 150-mm I.D.Schedule 80Aluminum or Schedule 80,Grade304 stainless steel pipe(see Fig.2),with removable top andbottom plates(13-mm thickness).The top plate(see Fig.3)shall have a mixing motor mount and 19-mm port for addingsolvent.The bottom plate(see Fig.4)shall be equipped with aquick connect fitting.Four 100-mm by 25-mm baffles(see Fig.5)shall be mounted in the extraction vessel along with thefollowing inserts in order as shown in Fig.1:a 3-mmaluminum or stainless steel ring,sieve cloth,2.00 mm(No.10)1This test method is under the jurisdiction of ASTM Committee D04 on Roadand Paving Materials and is the direct responsibility of Subcommittee D04.25 onAnalysis of Bituminous Mixtures.Current edition approved Dec.10,2002.Published February 2003.Originallyapproved in 2002.Last previous edition approved in 2002 as PS 13602.2Annual Book of ASTM Standards,Vol 04.03.3Annual Book of ASTM Standards,Vol 04.04.4Annual Book of ASTM Standards,Vol 04.08.5Annual Book of ASTM Standards,Vol 14.02.1Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959,United States.openings;spacer(see Fig.6);sieve cloth,300mm(No.50)openings;another spacer(see Fig.6);a 3-mm gasket;sievecloth,75 mm(No.200)openings;another 3-mm gasket;another sieve cloth,2.00 mm(No.10)openings.NOTE2All references to stainless steel materials should be Grade 304stainless steel to assure corrosion resistance.Sieve cloth should meetSpecification E 11 specifications.Brass sieve cloth is acceptable,however,brass will require replacement more often due to wear from aggregate.NOTE3If aluminum is used for the vessel several blank tests shouldbe