ASTM_D_6608_-_20.pdf

Designation:D660820Standard Practice for theIdentification 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 in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.1.3 This practice is limited to asphalt binders which areproduced in accordance with Specification D5710/D5710M.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,maybe hazardous to health and corrosive to materials.Cautionshould be taken when handling mercury and mercury-containing products.See the applicable Material Safety DataSheet(MSDS)for details and EPAs websitehttp:/www.epa.gov/mercury/index.htmfor additional information.Users should be aware that selling mercury and/or mercury-containing products into your state may be prohibited by statelaw.1.5 The text of this standard references notes and footnoteswhich provide explanatory material.These notes and footnotes(excluding those in tables and figures)shall not be consideredas requirements of the standard.1.6 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,health,and environmental practices and deter-mine the applicability of regulatory limitations prior to use.1.7 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:2D140/D140M Practice for Sampling Asphalt MaterialsD1856 Test Method for Recovery of Asphalt From Solutionby Abson MethodD2172/D2172M Test Methods for Quantitative Extraction ofAsphalt Binder from Asphalt MixturesD3666 Specification for Minimum Requirements for Agen-cies Testing and Inspecting Road and Paving MaterialsD5710/D5710M Specification for Trinidad Lake ModifiedAsphalt3.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 Asphalt contains sulfur compounds,most of which areremoved during refining;the resulting asphalt also containssulfur compounds which are released at the temperatures above230 C.Trinidad Lake Modified Asphalt contains sulfur com-pounds which are released at lower temperatures between170 C and 230 C.The release of sulfur from Trinidad LakeModified Asphalt tarnishes the copper strip and appears to berelated directly to the total TLA content.The copper strip testis designed to assess the qualitative presence of TLAin asphalt.NOTE1The quality of the results produced by this standard aredependent on the competence of the personnel performing the procedureand the capability,calibration,and maintenance of the equipment used.Agencies that meet the criteria of Specification D3666 are generallyconsidered capable of competent and objective testing,sampling,inspection,etc.Users of this standard are cautioned that compliance withSpecification D3666 alone does not completely ensure reliable results.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 Nov.1,2020.Published November 2020.Originallyapproved in 2000.Last previous edition approved in 2012 as D6608 12.DOI:10.1520/D6608-20.2For 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 StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of Inte