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Concrete Dec 2018

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SPONSORED CONTENT 26 CONCRETE COVERED DECEMBER 2018 COATINGSPROMAG.COM NACE/SSPC Joint Concrete Surface Preparation Standard Revised By Trudy Schreiner, Editor and Liaison, NACE Technical Activities Division T he members of the task group (TG) 417, a joint NACE International and Society for Protective Coatings (SSPC) committee assigned to review and revise the joint standard practice, NACE No. 6/SSPC-Surface Preparation (SP) 13: Surface Preparation of Concrete, has completed their task. According to the joint committee members, the standard has been the concrete industry's preferred surface preparation standard for 20 years and was long overdue for an update to reflect current industry best practices. ere were significant changes made to the standard by a joint committee of NACE and SSPC members. e changes in this revised standard will be of interest to specifiers, applica- tors, inspectors, and others who are responsible for defining a standard degree of cleanliness, strength, profile, and dryness of prepared concrete surfaces. One particular concern that the committee wanted to address was how the standard is used in specifications and other procurement documents. "is is a major rewrite and not just a facelift," said Bill Jenkins, NACE TG 417 committee chair and technical service manager of International Paints. "W hen used appropriately, the standard allows a specifier to choose appropriate methods of surface preparation that will yield results more along the lines of what he/she envisions." e committee members found that over the years, the standard has been specified often in very general terms, such as, "a concrete surface should be prepared in accordance with NACE No. 6/SSPC-SP 13," without regard to specific methods of prepar- ing the surface or of the testing methods and acceptance criteria to be used afterward. Using NACE No. 6/SSPC-SP 13 correctly should preclude or at least minimize project delays or litigation with regard to the details of surface preparation, according to a presentation given at SSPC 2018 by the TG leaders. "e revised standard requires that the specifier read the standard carefully and possibly educate him- or herself a bit more to correctly use the standard," said Jenkins. "Hopefully, it will eliminate the instances where a specifier merely specifies 'NACE No. 6' without any elabora- tion, which, in the past, has created confusion and more work for everyone down the contract chain." To maximize the effectiveness of NACE No. 6 when used as a specification, the committee members recommend: 1. the specific surface preparation method(s) should be specified from Table 1 (see table); 2. the specifier should include the appropriate testing method and acceptance criteria from Table 2 for the service condition (light or severe) or modify them, if needed, for the desired coating or lining system (see table). The Key Components "is revised standard details the requirements for surface preparation of concrete by mechanical and chemical methods before the application of bonded protective coating or lining systems, and by detailing specific methods of surface preparation as well as the amount of surface cleanliness and profile achievable by each method," said Fred Goodwin, FASTM, FACI, FICRI, member of TG 417, and head of EB Global Corrosion Competency Center at BASF Corporation. Components include: • Applicable Surfaces: Applies to all types of cementitious surfaces, including cast-in-place concrete floors and walls, precast slabs, masonry walls, shotcrete surfaces, cementitious grouts, overlayments, underlayments, and more. • Inspection/Evaluation Before Surface Preparation Operations: What to look for when assessing concrete before preparing it for coating and directions on methods to use. • Concrete Surface Preparation Methods: Includes four commonly used methods of general surface cleaning, one method for chemically preparing the surface (acid etching), and seven methods for mechanically preparing a concrete surface to accept the application of a coating or lining. • Inspection/Classification of Prepared Concrete Surfaces: The evaluation of prepared concrete surfaces is broken down into five main areas: Tensile Strength and Coating Adhesion, Surface Profile, Surface Cleanliness, pH, and Moisture Content. • Acceptance Criteria: The acceptance criteria in the revision hasn't changed much from the original version as far as what is being tested for, but Table 2 has updated references for test methods and qualifications for using these methods. • Supplemental Information, the Appendixes: Significant changes were made to the appendix by significantly expounding on the information in many of the sections. Concrete Covered

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