ASTM_D_6948_-_D_6948M_-_03_2011e1.pdf

Designation:D6948/D6948M03(Reapproved 2011)1Standard 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.1NOTEUnits information was editorially revised in June 2011.1.Scope1.1 This practice covers the application of emulsified re-fined coal tar slurry meeting the requirements of SpecificationD6945 Types I and II,by mechanized equipment as a weatherprotection and petroleum(aliphatic)solvent resistant sealer foruse on bituminous concrete pavements.In order to clarify thedifferences between Types I and II,see 3.3 for standarddefinition 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.2.Referenced Documents2.1 ASTM Standards:2D490 Specification for Road TarD5727 Specification for Emulsified Refined Coal Tar(Min-eral Colloid Type)D6945 Specification for Emulsified Refined Coal-Tar(Ready to Use,Commercial Grade)3.Terminology3.1 Two types of mixtures are defined in SpecificationD6945.The ingredients for both types of mixtures are normallycombined at the contractors yard or at the job site.Refinedcoal tar emulsion meeting Specification D5727 is concentratedwhen shipped from the manufacturer to the applicator.3.1.1 Specification D6945 Type I materialis SpecificationD5727 material diluted with water typically by the applicatorafter which aggregate is added.3.1.2 Specification D6945 Type II materialis SpecificationD5727 material diluted with water typically by the applicatorafter which additive and aggregate is 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 Type I or Type IIprior 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.3.3.5 bituminous concrete pavements,agedpavementsthat weathered over at least one summer season and haveshown signs of one or more of the following:cracking,raveling,aggregate polishing or graying due to oxidation,orcombination thereof.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 1,2011.Published June 2011.Originallyapproved in 2003.Last previous edition approved in 2003 as D2948 03.DOI:10.1520/D6948_D6948M-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 3.3.6 brush applicatora hand type or mechanized brushused to apply pavement sealer.3.3.7 crack fillera material that is placed in a pavementcrack or joint to fill but not necessarily seal the void created bythe crack or joint.3.3.8 crack sealanta material that has adhesive and cohe-sive properties to seal cracks,joints or other narrow openings(less than 38.5 mm 1-12in.wide)in pavements against theentrance or passage of water or other debris.3.3.9 cr