ASTM_D_5249_-_10_2021.pdf

Designation:D524910(Reapproved 2021)Standard Specification forBacker Material for Use with Cold-and Hot-Applied JointSealants in Portland Cement Concrete and Asphalt Joints1This standard is issued under the fixed designation D5249;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 specification covers backer material for cold-andhot-applied joint sealant for use in portland cement concrete orasphalt pavement joints.1.2 This specification establishes basic requirements forsealant backer material,either in rod or strip form,that canwithstand the temperature of hot-or cold-applied sealantswithout excessive deformation.1.3 Sealant backer material serves one or more of thefollowing purposes:1.3.1 Limits the amount and depth of sealant applied to ajoint,1.3.2 Acts as a barrier interface to prevent backside adhe-sion(bond breaker),and1.3.3 Provides a form to assist the sealant in developing ashape factor.1.4 The values stated in inch-pound units are to be regardedas the standard.The values in parentheses are for informationpurposes only.1.5 The following safety hazards caveat pertains only to thetest methods described in this specification.This standard doesnot purport to address all of the safety concerns,if any,associated with its use.It is the responsibility of the user of thisstandard to establish appropriate safety,health,and environ-mental practices and determine the applicability of regulatorylimitations prior to use.1.6 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:2C670 Practice for Preparing Precision and Bias Statementsfor Test Methods for Construction MaterialsC1016 Test Method for Determination of Water Absorptionof Sealant Backing(Joint Filler)MaterialC1253 Test Method for Determining the Outgassing Poten-tial of Sealant BackingD545 Test Methods for Preformed Expansion Joint Fillersfor Concrete Construction(Nonextruding and ResilientTypes)D1622 Test Method for Apparent Density of Rigid CellularPlasticsD1623 Test Method for Tensile and Tensile Adhesion Prop-erties of Rigid Cellular PlasticsD5535 Terminology Relating to Formed-in-Place Sealantsfor Joints and Cracks in Pavements(Withdrawn 2009)3E1 Specification for ASTM Liquid-in-Glass ThermometersE220 Test Method for Calibration of Thermocouples ByComparison Techniques3.Terminology3.1 For definitions,refer to Terminology D5535.4.Classification4.1 Sealant backer material is available in three types:4.1.1 Type 1,shall be round rods of various diametersintended for use with cold-and hot-applied sealants.4.1.2 Type 2,shall be sheets or strips of various thicknesses,laminated or skived by the manufacturer but capable of beingfield laminated and used with cold-and hot-applied sealants.4.1.3 Type 3,shall be round rods of various diameterslimited for use with cold-applied sealants.4.2 Type 1 and Type 3 rod materials are intended for useprimarily where there is a reservoir,either already existing or1This specification is under the jurisdiction of ASTM Committee D04 on Roadand Paving Materials and is the direct responsibility of Subcommittee D04.33 onFormed In-Place Sealants for Joints and Cracks in Pavements.Current edition approved May 1,2021.Published May 2021.Originallyapproved in 1992.Last previous edition approved in 2016 as D5249 10(2016).DOI:10.1520/D5249-10R21.2For 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.3The last approved version of this historical standard is referenced onwww.astm.org.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.1formed,such as a contraction joint,where the rod will limit thesealant depth and prevent the sealant from bonding to thebottom of the joint reservoir(bond breaker)thus eliminatingbottom-side adhesion.4.3 Type 2 strip material is intended primarily for use wherethere is an opening the full depth of the pavement,such as anexpansion joint for which it is desirable to have a filler materialcompletely fill the opening