1、Designation:D740309Standard Test Method forDetermination of Residue of Emulsified Asphalt by LowTemperature Vacuum Distillation1This standard is issued under the fixed designation D7403;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision
2、,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 method covers the quantitative determination ofresidue in emulsified asphalts composed principally of ase
3、misolid or liquid asphaltic base,water,and an emulsifyingagent.The emulsified asphalts will generally contain polymericmaterials.It is especially suitable for emulsified asphalt residueproperties that may be altered at the high temperature 260C(500F)distillation.Since there is currently not a precis
4、ionstatement for this procedure,it is recommended to the user thatthis procedure not be used for buy/sell purposes at the presenttime.1.2 The values stated in SI units are to be regarded as thestandard.Values in parentheses in inch-pound units are pro-vided for informational purposes only.1.3 This s
5、tandard 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.2.Referenced Documents2.1 AS
6、TM Standards:2D6997 Test Method for Distillation of Emulsified AsphaltE1 Specification for ASTM Liquid-in-Glass Thermometers3.Significance and Use3.1 This test method can be used for quantitative determi-nation of residue in emulsified asphalts at a temperature of135C(275F)with a 60 minute distillat
7、ion test using currentdistillation apparatus.This method is suitable to obtain resi-dues for service evaluation,quality control,and research.Thisdistillation method is not intended to produce residues equiva-lent to the Test Method D6997 260C(500F)distillationprocedure.4.Apparatus4.1 Aluminum Alloy
8、Still,conforming to Test MethodD6997 except that a 13 mm(12in.)diameter hole is drilledbetween the two existing 13 mm(12in.)thermometer holes forthe connection of a vacuum gauge(see Fig.1).The jointbetween the still and lid shall be air tight with the gasket inplace.Other heating devices may be used
9、 provided theyemploy the intended control of temperature during the distil-lation procedure.4.2 Connection Apparatus,Test Method D6997,with modi-fications as shown in Fig.2.Connection tubing may be ofsuitable materials provided the intended vacuum,temperature,and method is maintained.Other forms of
10、condensers may beused provided they have an equivalent or greater interiorsurface area for condensation of distillate.NOTE1Silicone rubber stoppers are recommended.4.3 Thermometric Device,ASTM 7C(7F)thermometers,orthermocouple devices calibrated at 135C(275F).The ther-mocouple probe,Type T with expo
11、sed junction,should be ofsufficient length(approximately 300 mm(12 in.)to bepositioned approximately 6 mm(0.25 in.)off the bottom of theassembled still.Use of equivalent thermometric devices ispermitted.4.4 Balance,capable of weighing 3500 grams to 6 0.1gram.4.5 Vacuum Pump,rotary vane type,capable
12、of maintaininga vacuum of 88 kPa below gauge pressure or greater.NOTE288 kPa below gauge pressure is equal to 26 in.Hg(660 mm)below atmospheric pressure.4.6 Gasket,of silicone rubber,3 mm(18in.)thick,cut to fitflanged opening on still.Other gasket materials may be usedprovided they withstand the max
13、imum temperature reachedduring distillation and are able to maintain the specifiedvacuum within the still.4.7 Vacuum Gauges,dial type or other suitable type con-nected to vacuum tubing and/or fittings to allow attachment toboth vacuum pump and to still apparatus and capable of1This test method is un
14、der the jurisdiction of ASTM Committee D04 on Roadand Paving Materials and is the direct responsibility of Subcommittee D04.42 onEmulsified Asphalt Test.Current edition approved June 1,2009.Published July 2009.DOI:10.1520/D7403-09.2For referenced ASTM standards,visit the ASTM website,www.astm.org,or
15、contact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 reading a minimum vacuum
16、of 88 kPa below gauge pressure(660 mm or 26 in.Hg below atmospheric pressure).4.8 Freezer,maintained at approximately 10C.4.9 Disposable Plastic Drink Cups,of convenient size andmake to serve as a container during freezing of emulsifiedasphalt.5.Hazards5.1 WarningMercury has been designated by the UnitedStates Environmental ProtectionAgency(EPA)and many stateagencies as a hazardous material that can cause central nervoussystem,kidney and liver damage.Mercury,or its vapor,may behazardous to healt
