ASTM_D_6936_-_09.pdf

Designation:D693609Standard Test Method forDetermining Demulsibility of Emulsified Asphalt1This standard is issued under the fixed designation D6936;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,applicable to both anionic and cationicemulsified asphalts of the RS and MS type,measures thechemical breaking of the emulsified asphalt.1.2 This test method 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.1.3 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.2.Referenced Documents2.1 ASTM Standards:2D511 Test Methods for Calcium and Magnesium In WaterD6934 Test Method for Residue by Evaporation of Emulsi-fied AsphaltD6997 Test Method for Distillation of Emulsified AsphaltE11 Specification for Woven Wire Test Sieve Cloth and TestSieves3.Significance and Use3.1 This test method is used to identify or classify anemulsified asphalt as an RS or MS by measuring the amount ofavailable asphalt that is broken from the emulsified asphalt byutilizing specified amounts and concentrations of calciumchloride solution for anionic emulsified asphalts and dioctylsodium sulfosuccinate for cationic emulsified asphalts.4.Sample Conditioning for Testing4.1 All emulsified asphalts shall be properly stirred toachieve homogeneity before testing.4.2 All emulsified asphalts with viscosity testing require-ments of 50C shall be heated to 50 6 3C in the originalsample container in a water bath or oven.The container shouldbe vented to relieve pressure.After the sample reaches 50 63C,stir the sample to achieve homogeneity.4.3 Emulsified asphalts with viscosity testing requirementsof 25C should be mixed or stirred at 25 6 1C in the originalsample container to achieve homogeneity.NOTE1Emulsified asphalts with viscosity testing requirements of25C may be heated and stirred as specified in 4.2,if necessary.In theevent the 4.2 method is used,the sample should be cooled to 25 6 1Cbefore testing.5.Apparatus and Reagents5.1 Wire Cloth1.40-mm wire cloth that is at least 125 mmsquare,unframed,and having wire diameters and openings thatconform to Specification E11.5.2 Beakermetal beaker or other suitable metal containerwith a minimum 300-mL capacity.5.3 Stirring Rodmetal rod with rounded ends,approxi-mately 10 mm in diameter.5.4 Buret50-mL glass buret graduated in 0.1 mL intervals.5.5 Calcium Chloride Solution(1.11 g/L)1.11 g of cal-cium chloride(CaCl2)dissolved in distilled or deionized waterand diluted to 1 L.The 1.11 g/L calcium chloride solution maybe standardized to be a 0.02 6 0.001 N solution of calciumchloride in water.Although this solution will remain stable,itshall be stored in an airtight container when not in use.5.6 Calcium Chloride Solution(5.55 g/L)5.55 g of cal-cium chloride(CaCl2)dissolved in distilled or deionized waterand diluted to 1 L.The 5.55 g/L calcium chloride solution maybe standardized to be a 0.10 6 0.001 N solution of calciumchloride in water.Although this solution will remain stable,itshall be stored in an airtight container when not in use.NOTE2Test Methods D511 is a method that could be used tostandardize the solutions in 5.5 and 5.6.5.7 Dioctyl Sodium Sulfosuccinate Solution(0.80%)8.00g of dioctyl sodium sulfosuccinate dissolved in 992 g ofdistilled or deionized water.This solution will degrade overtime and shall be stored in a cool dark location when not in use,in a dark glass or dark impermeable plastic air-tight container.1This test method is under 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.Originally approvedin 2004.Last previous edition approved in 2004 as D6936 04.DOI:10.1520/D6936-09.2For 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.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 It shall not be used for testing purposes if more than 90 dayshave elapsed since it was prepared.NOTE3A test method that could be used to standardize this solutioncan be found in“The United States Pharmacopeia,The National Formu-lary”under the section on Docusate Sodium(444.56)as recommended byCytec Industries(a manufacturer of this material).5.8 Balance,capable of weighing 500 6 0.1 g.5.9 O