ASTM_D_7944_-_22.pdf

Designation:D794422Standard Practice forRecovery of Emulsified Asphalt Residue Using a VacuumOven1This standard is issued under the fixed designation D7944;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 practice is suitable for recovery of the residue ofemulsified asphalts composed principally of a semisolid orliquid asphaltic base,water,and an emulsifying agent.Asphaltbase may be pre-modified with polymeric modifiers or latexpolymer modifiers may be incorporated into the emulsifiedasphalt through co-milling or post emulsified asphalt produc-tion blending.1.2 The text of this standard references notes and footnoteswhich provide explanatory material.These notes and footnotes(excluding those in tables and figures)shall not be consideredas requirements of the standard.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:2D244 Test Methods and Practices for Emulsified AsphaltsD7175 Test Method for Determining the Rheological Prop-erties of Asphalt Binder Using a Dynamic Shear Rheom-eterD7405 Test Method for Multiple Stress Creep and Recovery(MSCR)of Asphalt Binder Using a Dynamic ShearRheometer2.2 AASHTO Standards:3R 28 Accelerated Aging of Asphalt Binder Using a Pressur-ized Aging Vessel(PAV)PP 72 Standard Practice for Recovery Residue from Emul-sified Asphalt Using Low-Temperature Evaporative Tech-niques3.Summary of Practice3.1 Asample of emulsified asphalt is spread in a thin film ona silicone rubber mat and conditioned in a vacuum oven orother suitable vacuum chamber to remove the water.4.Significance and Use4.1 This practice can be used to obtain residues of emulsi-fied asphalts.The residue may be used for further testing.4.2 As approximately 5 g of residue is typically obtained,limited testing is possible.NOTE1Rheological characterization as described in Test MethodsD7175 and D7405 are suitable test methods.Additional test methods arebeing developed suited to the small amounts of residue obtained.5.Apparatus5.1 Silicone rubber mat4approximately 30 by 20 by 0.3 cm(approximately 12 by 9 by 0.15 in.),minimum of 40Adurometer.5.2 Supports for Silicone Rubber MatProvide adequatesupport of the silicone rubber mat during draw-down of thefilm,while transporting to the vacuum oven or other suitablevacuum conditioning chamber,and while recovering the emul-sified asphalt residue.The procedure uses two separatesupports,one at ambient temperature for draw-down andtransfer,and a second to support the silicone rubber mat andemulsified asphalt during residue recovery.Adequate supports1This practice is under the jurisdiction of ASTM Committee D04 on Road andPaving Materials and is the direct responsibility of Subcommittee D04.42 onEmulsified Asphalt Test.Current edition approved July 1,2022.Published August 2022.Originallyapproved in 2015.Last previous edition approved in 2015 as D7944 15.DOI:10.1520/D7944-22.2For 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.3Available from American Association of State Highway and TransportationOfficials(AASHTO),444 N.Capitol St.,NW,Suite 249,Washington,DC 20001,http:/www.transportation.org.4The sole source of supply of the apparatus(referred to as“Silicone RubberSheeting”in catalog)known to the committee at this time is McMaster Carr,200New Canton Way,Robbinsville,NJ 08691-2343,.If you areaware of alternative suppliers,please provide this information to ASTM Interna-tional Headquarters.Your comments will receive careful consideration at a meetingof the responsible technical committee,1which you may attend.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.1include but are not limited to a metal