1、Designation: D7497 09 (Reapproved 2016)Standard Practice forRecovering Residue from Emulsified Asphalt Using LowTemperature Evaporative Technique1This standard is issued under the fixed designation D7497; the number immediately following the designation indicates the year oforiginal adoption or, in
2、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 covers a method for recovering the residuefrom emulsified asphalts suc
3、h as those specified in Specifica-tions D977 and D2397 using a low temperature evaporativetechnique that is similar to pavement conditions. The recoveredresidue can be used for further testing as required.1.2 The values stated in SI units are to be regarded as thestandard. The values given in parent
4、heses are for informationonly.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 limitation
5、s prior to use.2. Referenced Documents2.1 ASTM Standards:2D977 Specification for Emulsified AsphaltD2397 Specification for Cationic Emulsified AsphaltD6934 Test Method for Residue by Evaporation of Emulsi-fied AsphaltD6997 Test Method for Distillation of Emulsified Asphalt2.2 Other Standard:NF EN 13
6、074 Recovery of Binder from Bitumen Emulsionsby Evaporation33. Significance and Use3.1 The procedure described in this practice is used toobtain a residue from an emulsified asphalt that may be usedfor further testing in devices such as a dynamic shear rheom-eter. The lower evaporative temperatures
7、of this procedureprovide conditions that are very close to that of applicationtechniques for these materials. This practice could be used inplace of recovery techniques such as those of Test MethodsD6934 and D6997, when the temperatures used in thosestandards would negatively affect the residue.4. R
8、eagents and Materials4.1 Silicone MatThe mat used can be similar to thatspecified in NF EN 13074 or any mat that will allow anemulsified asphalt spread rate of 1.5 to 2.0 kg/m2. The mat mayhave a lip to contain the emulsified asphalt to the appropriatearea.NOTE 1A silicone mat can be purchased at va
9、rious restaurant supplystores and a good size for this application is a half-sheet pan size to fit inmost laboratory ovens.4.2 SpatulaPalette knife or other suitable material forspreading the emulsified asphalt.4.3 Forced Draft OvenCapable of maintaining a tempera-ture of 25 6 2C and 60 6 2C. The ra
10、cks should be able tobe spaced a minimum of 10 cm from the top and bottom of theoven and with a spacing of a minimum of 4 cm between rackswith samples. The oven racks must be checked for level, witha bubble level of 250 mm minimum length, from side to sideand front to back of the oven.5. Procedure5.
11、1 Pour the required amount of emulsified asphalt onto thesilicone mat and spread evenly with a spatula to give a spreadrate of 1.5 to 2.0 kg/m2of emulsified asphalt. The silicone matshould be supported by an oven tray or other flat tray or panthat will allow easy transfer to an oven. Table 1 may be
12、usedas a guide for the quantities of emulsified asphalt necessary togive the appropriate spread rate for a given area.5.2 Place the silicone mat with the emulsified asphalt into a25 6 2C forced draft oven for 24 6 1h.5.3 Transfer the silicone mat with the emulsified asphalt toa606 2C forced draft ov
13、en for 24 6 1h.5.4 Remove the silicone mat with the emulsified asphaltresidue from the 60C oven and allow to cool at ambient labconditions for one hour prior to removal from the mat.1This practice is under the jurisdiction of ASTM Committee D04 on Road andPaving Materials and is the direct responsib
14、ility of Subcommittee D04.42 onEmulsified Asphalt Test.Current edition approved July 1, 2016. Published August 2016. Originallyapproved in 2009. Last previous edition approved in 2009 as D7497 09. DOI:10.1520/D7497-09R16.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact
15、 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 AFNOR (French Standard Institute), 11, rue Francis dePressens 93571 La Plaine Saint-Denis Cedex, France, http:/www.afnor.org
16、.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States15.5 Carefully peel the emulsified asphalt residue from themat using a wooden or plastic utensil to not damage thesilicone mat. The residue can be kneaded into the appropriatesample size
17、 for testing (see 3.1) if appropriate gloves are wornto not allow skin contact with the residue.NOTE 2For softer binders it may be necessary to cool the mat andresidue in a refrigerator prior to removal.NOTE 3Examples of a wooden or plastic utensil may be a tonguedepressor, silicone spatula, or plas
18、tic knife.NOTE 4The recovered binder may be stored in a sealed container atambient laboratory conditions for up to one week prior to testing.NOTE 5The recovered binder properties may be changed if heated toa liquid state for further testing.6. Keywords6.1 bitumen; emulsified asphaltASTM Internationa
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22、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 standard may be obtained by contacting ASTM at the aboveaddress or at 610-832-958
23、5 (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:/ 1 Emulsified Asphalt Quantity
24、by Mat Area for Appropriate Spread RateEmulsified Asphalt SpreadRateEmulsified Asphalt quantity in grams for each area in m20.01 m20.0225 m20.04 m20.0625 m21.5 kg/m215.0 g 33.75 g 60.0 g 93.75 g2.0 kg/m220.0 g 45.0 g 80.0 g 125.0 gNote: The area dimensions correspond to the following square and circle sizes in mm:Area Square Circle0.01 m2100 100 mm 56.4 mm radius0.0225 m2150 150 mm 84.6 mm radius0.04 m2200 200 mm 112.8 mm radius0.0625 m2250 250 mm 141.0 mm radiusD7497 09 (2016)2
