ASTM_D_6945_-_D_6945M_-_03_2011e1.pdf

Designation:D6945/D6945M03(Reapproved 2011)1Standard Specification forEmulsified Refined Coal-Tar(Ready to Use,CommercialGrade)1This standard is issued under the fixed designation D6945/D6945M;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.1NOTEUnits information was editorially revised in June 2011.1.Scope1.1 This specification covers mineral-colloid-stabilized,emulsified refined coal tar suitable for use as a weather-protective and petroleum(aliphatic)solvent resistant coating.This product is typically applied to commercial lots and otherlow speed bituminous concrete pavements suitable for protec-tion.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 requirements prior to use.2.Referenced Documents2.1 ASTM Standards:2C136 Test Method for Sieve Analysis of Fine and CoarseAggregatesC142 Test Method for Clay Lumps and Friable Particles inAggregatesD140 Practice for Sampling Bituminous MaterialsD490 Specification for Road TarD2939 Test Methods for Emulsified Bitumens Used asProtective CoatingsD3423 Practice for Application of Emulsified Coal-TarPitch(Mineral Colloid Type)D5727 Specification for Emulsified Refined Coal Tar(Min-eral Colloid Type)3.Terminology3.1 The refined coal tar emulsion mixed at the contractorsyard or at the job site shall meet the requirements of Specifi-cation D5727.Mixture Types I and II(see Appendix A ofPractice D3423 for standard definition of terms)are describedbelow:3.1.1 Type I materiala mixture of refined coal tar emul-sion meeting Specification D5727,water,and aggregate.3.1.2 Type II materiala mixture of refined coal tar emul-sion meeting Specification D5727,water,aggregate,and addi-tive.4.Classification4.1 This specification is designed to give specifying authori-ties the information necessary to ensure that the appropriatebase refined coal tar emulsion mixtures are specified forprotecting bituminous concrete pavements where fuel resis-tance is required.4.2 Normal aggregate loadings for Type I materials shouldrange from 0.360 to 0.600 kg/L3 to 5 lb/gal.Type II materialscan have slightly higher loadings of aggregate;however,aggregate loadings in excess of 0.720 kg/L 6 lb/gal arestrongly discouraged.NOTE1Several researchers have shown that high aggregate loadingsresult in a lack of fuel resistance as determined by the Resistance toKerosene test according to Test Methods D2939.Poor adhesion may alsooccur with high sand loadings.5.Materials and Manufacture5.1 Base Refined Coal Tar EmulsionThis emulsion shallbe made using binders prepared from a high temperaturerefined coal tar conforming to the requirements of SpecificationD490 for RT11 or higher.The use of oil and water gas tar is notallowed.The base refined coal tar emulsion shall be inaccordance with all requirements of Specification D5727.5.2 AggregateThe aggregate shall be either a natural ormanufactured(boiler slag has been used successfully)angular1This specification is under the jurisdiction of ASTM Committee D08 onRoofing and Waterproofing and is the direct responsibility of Subcommittee D08.09on Bituminous Emulsions.Current edition approved May 1,2011.Published June 2011.Originallyapproved in 2003.Last previous edition approved in 2003 as D6945 03.DOI:10.1520/D6945_D6945M-03R11E01.2For 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 aggregate composed of clean,hard,durable particles free ofclay and other objectionable material when tested in accor-dance with Test Method C142.(Boiler slag has been usedsuccessfully.)NOTE2It is recommended that this aggregate meet the gradationgiven in Table 1,when tested in accordance with Test Method C136.5.3 AdditiveIn the case of Type II material,the additiveshall be approved by the base refined coal tar emulsionmanufacturer.6.Performance Requirements6.1 Type I CompositionThe refined coal tar emulsion sealcoat shall consist of a mixture of refined coal tar emulsion,water,and aggregate and be proportioned within the ranges asshown in Table 2.The composition