D7234-21 Standard Test Method for Pull-Off Adhesion Strength of Coatings on Concrete UsingPortable Pull-Off Adhesion Testers

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Designation: D7234-21 Standard Test Method for Pull-Off Adhesion Strength of Coatings on Concrete UsingPortable Pull-Off Adhesion Testers11. Scope1.1 This test method covers procedures for evaluating thepull-off adhesion strength of a coating on concrete.The testdetermines the greatest perpendicular force (in tension) that asurface area can bear before a plug of material is detached.Failure will occur along the weakest plane within the systemcomprised of the loading fixture,glue，coating system,andsubstrate，and will be exposed by the fracture surface.1.2 This test method uses a class of apparatus known asportable pull-off adhesion testers.3They are capable of apply-ing a concentric load and counler load to a single surface sothat coatings can be tested even though only one side isaccessible. Measurements are limited by the strength of adhe-sion boncls between the loading fixture,coating system and thesubstrate or the cohesive strengths of the glue, coating layers.and substrate.1.3 This test method is suitable for both laboratory and fieldtesting.1.4 Pull-off adhesion strength measurements depend uponboth material and instrumental parameters.There are differentinstruments used that c

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