ASTM_D_4796_-_17.pdf

Designation:D479617Standard Test Method forBond Strength of Thermoplastic Pavement MarkingMaterials1This standard is issued under the fixed designation D4796;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 test method provides an instrumental means for thedetermination of thermoplastic pavement marking materialbond strengths using cement bricks and loading fixtures.1.2 The values stated in inch-pound units are to be regardedas standard.The values given in parentheses are mathematicalconversions to SI units that are provided for information onlyand are not considered 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,health and environmental practices and deter-mine the applicability 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:2C109/C109M Test Method for Compressive Strength ofHydraulic Cement Mortars(Using 2-in.or 50-mm CubeSpecimens)D16 Terminology for Paint,Related Coatings,Materials,andApplicationsD4541 Test Method for Pull-Off Strength of Coatings UsingPortable Adhesion TestersD5179 Test Method for Measuring Adhesion of OrganicCoatings in the Laboratory by Direct Tensile MethodD7234 Test Method for Pull-Off Adhesion Strength of Coat-ings on Concrete Using Portable Pull-Off Adhesion Tes-tersD7307 Practice for Sampling of Thermoplastic Traffic Mark-ing MaterialsD7308 Practice for Sample Preparation of ThermoplasticPavement Marking MaterialsE177 Practice for Use of the Terms Precision and Bias inASTM Test MethodsE691 Practice for Conducting an Interlaboratory Study toDetermine the Precision of a Test Method3.Terminology3.1 The terms and definitions in Terminology D16 apply tothis method.3.2 Definitions of Terms Specific to This Standard:3.2.1 cement brick,na type of brick(a solid masonry unit,rectangular in shape)made from a mixture of cement and sand,molded under pressure and cured under steam at 200F(93C);used as backing brick and where there is no danger of attackfrom acid or alkaline conditions.These bricks are not colorizedand have a compressive strength of 3000 to 5000 psi.3.2.2 loading fixture,n(also referred to as dollies,studs,orjigs)metal fixture round and flat on one end for bonding to testsample and shaped on the other end for attaching to tensiletesting device.Measurements are listed in inches.(Fig.1).3.2.3 thermoplastic,npavement marking(same as 3.2.4).3.2.4 thermoplastic pavement marking,na highly filled100%total solids highway marking system that when heatedto a molten state can be extruded or sprayed onto a road surfaceand when cooled forms a solid durable delineator or roadmarking thermoplastic usually melted to 425F(218C).4.Summary of Test Method4.1 The thermoplastic specimen is prepared for this test byfirst melting a sample to its application temperature undercontinuous agitation.The specimen is then applied to thespecified cement brick using a hot drawdown bar(Fig.2),heated to 220 6 5F(104 6 2C),at 125 mils(3.175 mm)thickness.While the thermoplastic is still soft,three cuts aremade with a 1.6 in.(40.6 mm)diameter die(Fig.4),heated to220 6 5F(104 6 2C),in order to separate the test area fromthe rest of the drawdown.The die may be heated while1This test method is under the jurisdiction of ASTM Committee D01 on Paintand Related Coatings,Materials,and Applications and is the direct responsibility ofSubcommittee D01.44 on Traffic Coatings.Current edition approved July 1,2017.Published August 2017.Originallyapproved in 1988.Last previous edition approved in 2010 as D4796 10.DOI:10.1520/D4796-17.2For 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 submerged in glycerin to prevent thermoplastic from stickingto the die.The test areas are allowed to co