This test method is suitable for both field and laboratory use to quantify the depth of surface roughness of prepared concrete. A surface profile can be imparted into concrete by abrasive blast cleaning, acid etching or various scarifying tools. The resulting surface profile depth can influence coating/lining adhesion and performance. The International Concrete Repair Institute (ICRI) provides a qualitative method of evaluating surface roughness using nine different visual comparators, and ASTM D7682 describes a procedure for creating a replica of the prepared surfaces using a putty, then measuring the depth of the roughness using a special micrometer. This proposed method enables the user to quantitatively determine the surface profile of the prepared concrete surface in multiple locations without having to create a replica. The procedure is similar to that described in ASTM D4417, Method B, which is specifically for abrasive blast cleaned steel surfaces.
KeywordsConcrete; depth micrometer; surface roughness; surface profile
Proper bonding of coatings and linings to concrete surfaces frequently requires the concrete to be roughened first to increase the surface area. Until recently there was no convenient, reliable method to obtain roughness measurements directly from the prepared concrete. Advances in technology now enable users to quantify surface roughness in many locations without needing to create a replica of the profile first. More than one instrument manufacturer offers this technology. It will enable owners and installers to verify adequate surface roughness in multiple locations reasonably quickly to help ensure long-term performance.Back to Top