ASTM_D_6948_-_D_6948M_-_03_2017.pdf

Designation:D6948/D6948M03(Reapproved 2017)Standard Practice forApplication of Refined Coal Tar(Ready to Use,CommercialGrade)1This standard is issued under the fixed designation D6948/D6948M;the number immediately following the designation indicates theyear of original adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of lastreapproval.A superscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This practice covers the application of emulsified re-fined coal tar slurry meeting the requirements of SpecificationD6945/D6945M Types I and II,by mechanized equipment as aweather protection and petroleum(aliphatic)solvent resistantsealer for use on bituminous concrete pavements.In order toclarify the differences between Types I and II,see 3.3 forstandard definition of terms.1.2 The values stated in either SI units or inch-pound unitsare to be regarded separately as standard.The values stated ineach system may not be exact equivalents;therefore,eachsystem shall be used independently of the other.Combiningvalues from the two systems may result in non-conformancewith the standard.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.1.4 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:2D490 Specification for Road TarD5727/D5727M Specification for Emulsified Refined CoalTar(Mineral Colloid Type)D6945/D6945M Specification for Emulsified Refined Coal-Tar(Ready to Use,Commercial Grade)3.Terminology3.1 Two types of mixtures are defined in SpecificationD6945/D6945M.The ingredients for both types of mixturesare normally combined at the contractors yard or at the jobsite.Refined coal tar emulsion meeting Specification D5727/D5727M is concentrated when shipped from the manufacturerto the applicator.3.1.1 Specification D6945/D6945M Type I materialisSpecification D5727/D5727M material diluted with watertypically by the applicator after which aggregate is added.3.1.2 Specification D6945/D6945M Type II materialisSpecification D5727/D5727M material diluted with watertypically by the applicator after which additive and aggregateis added.3.2 The mixtures described in 3.1.1 and 3.1.2 can besubmitted to a laboratory approved by the owner for testing oftheir conformance to Specification D6945/D6945M Type I orType II prior to their actual use on the job.3.3 Definitions:3.3.1 additiveone or more ingredients that can be added toa specific refined coal tar emulsion,water,or sand(or combi-nation thereof)mixture to improve the coatings durability,fuelresistance,drying time,color uniformity,or length of timerequired before opening the surface to traffic,or combinationthereof.This material can also be used to modify the wetmixtures viscosity to improve aggregate suspension.Becausethere is such a wide variance of additives on the market,theaforementioned results may not take place.If an additive isused,it is recommended that it be supplied by the samemanufacturer as the refined coal tar emulsion.3.3.2 application ratethe volume of mixed materials ap-plied per area of pavement surface,usually expressed in litersper square meter(L/m2)gallons per square yard(gal/yd2).3.3.3 applied mixturethe combination of all ingredientsmixed together and ready for application to the pavement.Alsoreferred to as seal coat or sealer.3.3.4 bituminous concrete pavements,newpavements thathave been placed less than 90 days.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 May 1,2017.Published May 2017.Originallyapproved in 2003.Last previous edition approved in 2011 as D6948/D6948M 03(2011)1.DOI:10.1520/D6948_D6948M-03R17.2For 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 International Standards,Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade(TBT)Committee.1 3.3.5 bituminous concrete pavements,age