1、Designation: D7944 15Standard 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 revisio
2、n. 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
3、 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 This standard does not purport to address all of thesafety c
4、oncerns, 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.2. Referenced Documents2.1 ASTM Standards:2D244 Test Methods and Practices for
5、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:3R28 Accelerated Aging of Asphalt Bin
6、der 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 orot
7、her 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.NOTE 1Rheological charact
8、erization 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
9、.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
10、at ambient temperature for draw down andtransfer, and a second to support the silicone rubber mat andemulsified asphalt during residue recovery. Adequate supportsinclude but are not limited to a metal plate or tile withdimensions that are larger than the silicone rubber mat.5.3 Draw down applicator5
11、with the ability to draw down awet film approximately 0.38 mm (15 mils) in thickness. (SeeFig. 1.)1This 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 Oct.
12、 1, 2015. Published December 2015. DOI:10.1520/D7944-15.2For 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.3Avai
13、lable 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
14、 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
15、attend.5The sole source of supply of the apparatus (8-Path Wet FilmApplicator) knownto the committee at this time is Paul N. Gardner Company, Inc., 316 N.E. FirstStreet, Pompano Beach, FL33060, . If you are aware of alternativesuppliers, please provide this information to ASTM International Headquar
16、ters.Your comments will receive careful consideration at a meeting of the responsibletechnical committee,1which you may attend.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States15.4 Vacuum oven or any suitable heated pressure reductionve
17、ssel, capable of maintaining a temperature of 60 6 5C (1406 10F) and holding a vacuum of 1300 6 500 Pa (0.4 6 0.2inHg) absolute pressure for the specified test time.5.5 Tool capable of removing the emulsified asphalt residuefrom the silicone rubber mat after recovery without the use ofheat or chemic
18、al reagents. Recommended tools include a metalspatula to scrape off the material or rolling by a glass rod. Useremoval tools with dimensions suitable for the area of thedrawn down emulsified asphalt film.6. Reagents and Materials6.1 Cleaning agent, capable of removing residual asphaltand other oils
19、from the silicone rubber mat. Halogenatedsolvents should not be used on the silicone rubber mat material.6.2 Remove any remaining oils from the silicone rubbermat. Do not use a soap-water solution.NOTE 2VM emulsified asphalt recovery; emul-sified asphalt residueNOTE 1Ideal shape is a rectangle the w
20、idth of the applicator. Signs of pooling/beading include migration of the emulsified asphalt towards the centerof the mat (a), or presence of voids and irregularities on surface of film (b).FIG. 3 Examples of Pooling After Thin Film Draw DownFIG. 4 Example of Silicone Rubber Mat Surface After Wiping
21、Clean, Prior to Re-application of Emulsified AsphaltD7944 154ASTM 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 of any such p
22、atent rights, and the riskof infringement of such rights, are entirely their own responsibility.This standard is subject to revision at any time by the responsible technical committee and must be reviewed every five years andif not revised, either reapproved or withdrawn. Your comments are invited e
23、ither for revision of this standard or for additional standardsand should be addressed to ASTM International Headquarters. Your comments will receive careful consideration at a meeting of theresponsible technical committee, which you may attend. If you feel that your comments have not received a fai
24、r hearing you shouldmake your views known to the ASTM Committee on Standards, at the address shown below.This standard is copyrighted by ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959,United States. Individual reprints (single or multiple copies) of this sta
25、ndard may be obtained by contacting ASTM at the aboveaddress or at 610-832-9585 (phone), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org). Permission rights to photocopy the standard may also be secured from the Copyright Clearance Center, 222Rosewood Drive, Danvers, MA 01923, Tel: (978) 646-2600; http:/ 1a) Removing from Silicone Rubber Mat, b) Depositing into Sample ContainerFIG. 5 Handling Emulsified Asphalt Residue After RecoveryD7944 155
