ASTM_D_1856_-_21.pdf

Designation:D185621Standard Test Method forRecovery of Asphalt from Solution by Abson Method1This standard is issued under the fixed designation D1856;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This test method covers the recovery by the Absonmethod of asphalt from a solution from a previously conductedextraction.The asphalt is recovered with properties substan-tially the same as those it possessed in the bituminous mixtureand in quantities sufficient for further testing.1.2 The values stated in SI units are to be regarded as thestandard.The values given in parentheses are provided forinformation only.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,health,and environmental practices and deter-mine the applicability of regulatory limitations prior to use.1.4 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:2C670 Practice for Preparing Precision and Bias Statementsfor Test Methods for Construction MaterialsD2172/D2172M Test Methods for Quantitative Extraction ofAsphalt Binder from Asphalt MixturesD2939 Test Methods for Emulsified Bitumens Used asProtective Coatings(Withdrawn 2012)3D4080 Specification for Trichloroethylene,Technical andVapor-Degreasing GradeD6368 Specification for Vapor-Degreasing Solvents Basedon normal-Propyl Bromide and Technical Grade normal-Propyl BromideD8159 Test Method for Automated Extraction of AsphaltBinder from Asphalt MixturesE1 Specification for ASTM Liquid-in-Glass Thermometers3.Summary of Test Method3.1 The solution of solvent and asphalt from an asphalt mixextraction is distilled under prescribed conditions to a pointwhere most of the solvent has been distilled,at which timecarbon dioxide gas is introduced into the distillation process toremove all traces of the extraction solvent.The recoveredasphalt(distillation residue)can then be subjected to furthertesting as required.4.Significance and Use4.1 The asphalt should be extracted from the aggregate-asphalt mixture in accordance with Method A of Test MethodsD2172/D2172M(centrifuge method)or D8159 as there issome experimental evidence that the recovered asphalt mayhave slightly lower penetration values when recovered fromsolutions obtained from hot extraction methods.5.Apparatus5.1 Centrifuge,batch unit capable of exerting a minimumcentrifugal force of 770 times gravity or continuous unitcapable of exerting a minimum force of 3000 times gravity.5.2 Centrifuge TubesA supply of wide-mouth bottles orcentrifuge tubes may be used for the batch unit.A tube asillustrated in Fig.1 has been found satisfactory for thecontinuous unit.5.3 Distillation Assembly,as shown in Fig.2,and consistingof the following items:5.3.1 Extraction FlasksTwo 250-mL,wide-mouth,heat-resistant flasks,one for distillation and the other for thereceiver.5.3.2 Glass TubingHeat-resistant glass tubing,having10-mm inside diameter and gooseneck shaped(as shown inFig.2)for connecting the flask to the condenser.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 Asphalt Mixtures.Current edition approved May 1,2021.Published June 2021.Originallyapproved in 1961.Last previous edition approved in 2015 as D1856 09(2015).DOI:10.1520/D1856-21.2For 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.3The last approved version of this historical standard is referenced onwww.astm.org.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade(TBT)Committee.1FIG.1 Centrifuge Tube ExampleFIG.2 Distillation Assembly for Bitumen RecoveryD1856 2125.3.3 Inlet Aeration Tube,4at least 180 mm in length,havinga 6-mm outside diameter with a 10-mm bulb carrying sixstaggered side holes approximately 1.5 mm in diameter.5.3.4 Electric Heating Mantle,with variable transforme