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35 NACE INTERNATIONAL: VOL. 55, NO. 10 MATERIALS PERFORMANCE OCTOBER 2016 eir research is published in the May 2016 ACS Appied Materials & Interfaces arti- cle, "Ultra-Durable and Transparent Self- Cleaning Surfaces by Large-Scale Self- Assembly of Hierarchical Interpenetrated Polymer Networks," by W.S.Y. Wong, et al. Source: Australian National University, anu.edu.au. Protecting Concrete with Coatings in film coatings for concrete, which pro- vide additional concrete cover through their performance properties, are an ac- cepted method for protecting the under - lying steel reinforcement from corrosion. At the NACE International Concrete Service Life Extension Conference in May, different types of coatings for concrete buildings and parking structures were dis- cussed by H. Peter Golter, business develop- ment manager with 3M Co. (St. Paul, Min- nesota). During his presentation, Golter commented that concrete is vulnerable and can absorb constituents such as carbon di- oxide (CO 2 ), chlorides, oils, fats, water, and other soluble materials. Although coatings can protect concrete from these contami- nants, he noted that one type of coating does not satisfy all applications and out- lined several design factors to consider when selecting a protective coating. ese included the geographic location and cli- mate, wall and slab types, form of insula- tion, and type of air barrier. According to Golter, the coatings most commonly used on building structures are acrylics, urethanes/polyurethanes, and epoxies; and numerous types of materials are available within each group. Depending on the type of coating used, protection properties can include CO 2 , chloride, and ultraviolet (UV) resistance, abrasion resis- tance, and crack bridging. Acrylics, for example, are typically used on vertical sur- faces and horizontal non-traffic/foot traffic surfaces. Urethanes can be used on vertical surfaces; horizontal surfaces with foot traf- fic; and, with some coating formulations, horizontal surfaces with vehicular traffic. Epoxies also can be used on vertical sur- faces, horizontal surfaces with foot traffic, and horizontal surfaces with vehicular traf- fic, depending on the particular coating. Before installing a coating, Golter says a project overview needs to be completed. is includes reviewing the primary objec- tives for a coating system, surveying the condition of the substrate, determining substrate repairs and surface preparation required prior to coating application, quali- fying the coating contractor, planning for third-party validation of the coating appli- cation, and developing a maintenance program. Golter also stressed asset management and the importance of developing a com- prehensive sustainability program with a "repair, protect, and enhance" strategy when approaching a project. e driving force behind this, he says, is return on in- vestment for the sustainability program. He listed several questions to answer before finalizing a plan, such as the condition of the structure, its remaining service life, the maintenance that has been deferred, and what should be repaired first. Ultimately, he said, it is the sustainability of a concrete structure that allows conservation of re- sources and better use of finite funds. More information can be found in Golter's paper, no. W17 from the Concrete Service Life Extension Conference, "Concrete Coatings— What Are the Different Types and Why Use em?"