ASTM_D_6608_-_12.pdf

Designation:D660812Standard Practice forthe Identification of Trinidad Lake Asphalt in Asphalt Mixes1This standard is issued under the fixed designation D6608;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 shall be used for the qualitative determi-nation of Trinidad Lake Asphalt in Trinidad Lake ModifiedAsphalt Cements obtained from production blends or recov-ered binder from asphalt paving mixtures.1.2 The values stated is SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.1.3 It is limited to the binder content of Trinidad LakeModified Asphalt(Specification D5710)used in the construc-tion of asphalt pavements.1.4 WarningMercury has been designated by the UnitedStates Environmental Protection Agency and many state agen-cies as a hazardous material that can cause central nervoussystem,kidney and liver damage.Mercury,or its vapor,may behazardous to health and corrosive to materials.Caution shouldbe taken when handling mercury and mercury containingproducts.See the applicable Material Safety Data Sheet(MSDS)for details and EPAs websitehttp:/www.epa.gov/mercury/index.htmfor additional information.Users shouldbe aware that selling mercury and/or mercury containingproducts into your state may be prohibited by state law.1.5 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:2D140 Practice for Sampling Bituminous MaterialsD1856 Test Method for Recovery of Asphalt From Solutionby Abson MethodD2172 Test Methods for Quantitative Extraction of BitumenFrom Bituminous Paving MixturesD5710 Specification for Trinidad Lake Modified AsphaltE1 Specification for ASTM Liquid-in-Glass Thermometers3.Summary of Test Method3.1 A polished copper strip is immersed in a given quantityof sample and heated at a temperature and for a given timecharacteristic of the material being tested.At the end of thisperiod the copper strip is removed,washed,and compared withthe classifications of the TLA Copper Tarnishing Ranges forcopper strips.4.Significance and Use4.1 Bitumen contains sulfur compounds most of which areremoved during refining,the resulting asphalt cement alsocontains sulfur compounds which are released at the tempera-tures above 230C.Trinidad Lake Modified Asphalt containssulfur compounds,which are released at lower temperaturesbetween 170C and 230C.The release of sulfur from TrinidadLake Modified Asphalt tarnishes the copper strip and appearsto be related directly to the total TLA content.The copper striptest is designed to assess the qualitative presence of TLA inasphalt cements.5.Apparatus5.1 Test Tubes,25 by 150 mm.5.2 Provide a bath,which can maintain a constant tempera-ture of 210 6 1C(410 6 2F)and 225 6 1C(437 6 2F).The bath should have suitable supports to hold the test tubes ina vertical position and immersed to a depth of about 100-mm(4-in.).Oil or aluminum block baths are suitable.5.3 Thermometric Device,partial immersion thermometerfor indicating the required test temperature,with graduations1C or less.The ASTM 2C thermometer is suitable.Any otherthermometric device of equal accuracy may be used.5.4 Polishing Vise,to hold the copper strip firmly withoutmarring the edge while polishing.Any suitable holder may beused provided that the surface is held tightly and the surfacebeing polished is supported above the surface of the holder.5.5 Viewing Test Tubes,flat glass test tubes,are convenientfor protecting corroded strip and may be used for closeinspection and storage.1This practice is under the jurisdiction of ASTM Committee D04 on Road andPaving Materials and is the direct responsibility of Subcommittee D04.47 onMiscellaneous Asphalt Tests.Current edition approved Dec.1,2012.Published December 2012.Originallyapproved in 2000.Last previous edition approved in 2006 as D6608 00(2006).DOI:10.1520/D6608-12.2For 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 6.Materials6.1 Polishing Materials:6.1.1 Silicone carbide grip paper of varying degrees offineness including 65 m(240 grit)paper or cloth.6.1.2 Silicone carbide grains 105 m(150mesh).6.1.3 Absorbent cotton(cotton wool),pharmaceuticalgrade.6.2 Copper Strips:6.2.1 SpecificationsUse strips 12.5 mm wide,1.5 to 3.0m