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SURFACE 2018

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COATINGSPRO SURFACE PREP 2018 35 Concrete and Water Accumulation of dust more naturally occurs on horizontal surfaces, the interior of pipes, and in structural cavities." A lso Scope 1.3 of the standard says, "Because of the limited elasticity of adhesive tape, it is not possible for the tape to penetrate into the deep pits present in cleaned steel." is infers that the 30-year-old ISO standard for cleanliness is marginal, at best. en, what's the solution? e University of Utah 's Engineering Department prepared a paper on adhesive tape versus a two-sided adhesive foam tape that would penetrate into the anchor profile of the blast-cleaned substrate. Obviously, knowing the amount of and the removal of debris in the profile would greatly increase the ability of a coatings adhesion. is may be a step in the right direction to confirm the cleanliness of steel substrates. Concrete Standards ISO standard 8502-3 was written for a steel substrate with a profile determined by use of Testex tape or a profile depth gage, so the question arises: W hat about profile and surface cleanliness on concrete? International Concrete Repair Institute (ICRI) supplies both contractor and inspector with guidelines for surface preparation. ICRI 310.2R-2013: Selecting and Specif ying Concrete Surface Preparation for Sealers, Coatings, Polymer Overlays, and Concrete Repairs lists 10 concrete surface profile (CSP) chips to show types of prep. ese range from CSP1, "acid etching," to CSP10, " handheld concrete breaker followed by abrasive blasting." A ll of these surface preparation methods produce a surface profile — and dust. In Appendix B, section 6, ASTM standard D7682-2017: Standard Test Method for Replication of Concrete Surface Profiles Using Replica Tape employs both a Method "A" Visual compar- ison and a Method "B" quantifiable method of determining surface profile. Method "A" employs the use of the replica putty of 3 selected areas compared visually to the 10 ICRI CSP chips. Method "B" uses a specifically designed profile thick- ness gage, measuring 10 spots on each putty disc and compar- ing the range of highest and lowest readings to one of the ICRI CSP chips. A quantifiable range comparison can then be made using Method "B." Within the ICRI Guideline 310.2R-2013 appendix, surface profile can be determined by numerous methods, including the method described in ASTM D7682. Testing Is it realistic to be able to have a clean steel or concrete surface? Would it be appropriate to use tape to confirm cleanliness on the substrate? p h o to co u r te s y o f t h e au t h o r

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