ASTM_D_6805_-_02_2008.pdf

Designation:D680502(Reapproved 2008)Standard Practice forInfrared(IR)Procedure for Determination of Aromatic/Aliphatic Ratio of Bituminous Emulsions1This standard is issued under the fixed designation D6805;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 uses infrared analytical techniques toqualitatively determine in the laboratory a ratio of aromaticabsorbance to aliphatic absorbance.This practice may be usedto determine if the bitumen in the emulsion is predominantlyaromatic or aliphatic in nature.1.2 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.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 limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2D2939 Test Methods for Emulsified Bitumens Used asProtective Coatings(Withdrawn 2012)33.Terminology3.1 Definitions:3.1.1 aliphatica group of organic compounds character-ized by straight-or branched-chain arrangements of the con-stituent carbon atoms.Examples of aliphatic compounds in-clude paraffins(alkanes),olefins(alkenes),and acetylenes(alkynes).These compounds are primarily found in petroleumsources.Hawleys Condensed Chemical Dictionary43.1.2 aromatica group of organic compounds made up ofunsaturated cyclic hydrocarbons containing one or more rings,an example of which is benzene.Large numbers of thesecompounds are derived from petroleum and coal tar,and areclassified as“aromatics”because of their strong and notunpleasant odor characteristics.Hawleys Condensed Chemical Dictionary43.1.3 infrared absorbancethe range of wavelengths in theinfrared that are absorbed by a specimen and identify itsmolecular components and compound structures.The infraredregion of the electromagnetic spectrum includes wavelengthsfrom 0.70 m to approximately 300 m,that is,longer thanvisible light and shorter than microwave.Hawleys Condensed Chemical Dictionary44.Summary of Practice4.1 A sample of bituminous emulsion from which the waterhas been removed using Na2SO4is dissolved in carbondisulfide(CS2),and the infrared(IR)absorbance from 2.5 to4.2 m is determined.The absorbance at 3.27 m(aromatic)isdivided by the absorbance at 3.40 m(aliphatic)to obtain theIR ratio.5.Significance and Use5.1 The results of this practice may be used to distinguishtar-based emulsion from an asphalt-based emulsion for speci-fication compliance purposes.6.Apparatus6.1 Infrared Spectrophotometer.6.2 Sealed Sodium Chloride(NaCl)IR Cell,with 0.1 to 1mm path length.6.3 IR Cell Cleaner.6.4 Vacuum Pump and Dry-Ice Trap,to protect pump.6.5 Syringe,glass,10 mL.6.6 Mechanical Shaker.6.7 Sieves,No.40(425 m opening)and No.100(150 m).6.8 Balance,capable of weighing to 0.001 g.6.9 Pipet,10 mL and rubber bulb.1This practice is under the jurisdiction ofASTM Committee D08 on Roofing andWaterproofing and is the direct responsibility of Subcommittee D08.09 on Bitumi-nous Emulsions.Current edition approved Dec.1,2008.Published December 2008.Originallyapproved in 2002.Last previous edition approved in 2002 as D6805 021.DOI:10.1520/D6805-02R08.2For 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.3The last approved version of this historical standard is referenced onwww.astm.org.4Lewis,R.J.,Sr.,Hawleys Condensed Chemical Dictionary,ThirteenthEdition,New York,Van Nostrand Reinhold,1997.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 7.Reagents and Materials7.1 Disposable“Medicine”Dropper.7.2 Vial,20 mL,with cork-backed metal foil liner.7.3 Filter Paper,rapid flow rate,12.5 cm.7.4 Glass Funnel,for above filter paper.7.5 Carbon Disulfide(CS2),spectroscopy grade.7.6 Sodium Sulfate(Na2SO4),anhydrous.8.Hazards8.1 Carbon disulfide(CS2)is a hazardous material and mustbe handled properly.Before using CS2,read and understand theCS2Material Safety Data Sheet and the label on the CS2bottle.Use appropriate precautions,including safety equipment,whenhandling CS2.Be sure to work in a properly operating hoodand wear appropriate gloves.9.Sampling,Test Specimens,and Preparation9.1 Every effort should be taken to ensure that a represen-tative sample is taken.Follow Section 4 from Test MethodsD2939 for sampling.10.Dehydration of Sample10.1 Dehydration is not necessary since a drying agent(Na2SO4)will be added in a later step.11.Preparation of Working Sample