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The benefit of cementitious coating for repairs was validated by Chris Atkins, senior materials engineer within the Materials and Corrosion Engineering Section of Mott MacDonald Consulting Engineers, in Altrincham, UK. In a recently published interview in the Journal of Protective Coatings and Linings, Atkins concluded that the application of a polymer-modified cementitious coating at thicknesses over 2 mm (80 mils) is the best method to protect concrete structures in wastewater treatment systems.

An independent study of MAPEI's Mapelastic™, designed to provide a crack-bridging barrier that impedes carbonation and chloride penetration of the concrete, showed effectiveness in halting chloride penetration. The test evaluated two specimens — uncoated concrete, and concrete coated with Mapelastic. In the test environment, both specimens were immersed in a 10 percent solution of sodium chloride (NaCl) for 60 days. According to National Italian UNI 7928 standard test method, analysis of the specimens showed that the uncoated sample exhibited chloride penetration of 35 mm, while the Mapelastic-coated sample had chloride penetration depth of 1 mm.

Todd Miller is the Product Line Manager for MAPEI's Concrete Restoration Systems division. Experienced in product line management, marketing, systems development and customer service, Todd is committed to innovative products and positive customer solutions.

For information on MAPEI products and systems, visit www.mapei.com.