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Eight-year test concludes additive treated concreteis superior to Calcium Aluminate cement in seve

ConMICShield® Additive for Corrosion Protection of Concrete in Manholes


In 1999 the city of Grand Rapids, Michigan, under the direction of Chuck Schroeder, city engineer, embarked on a study to determine the optimal method for preventing concrete corrosion in sanitary manholes due to hydrogen sulfide gas. Turbulence, moderately-high temperatures, and septic sewage create conditions that are ideal for sulfuric acid (H2SO4) production. Sulfuric acid is formed when aerobic (air-breathing) bacteria on the walls of the manholes metabolize hydrogen sulfide gas and oxygen. Their waste by-product is sulfuric acid, which results in the rapid decay of concrete. The technical name of this process is microbiologically induced corrosion (MIC).

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CONSHIELD Technologies Inc.
541 Tenth Street NW #233
Atlanta, 30318, USA
T +1 877 543 2094
F +1 404 420 2160

CPi worldwide journals are trade journals for the concrete and precast concrete industry that are published in 10 different language editions in more than 170 countries. These trade journals, with their practical editorial reporting on research, production and applications, are specifically addressing the decision makers of the concrete and precast concrete industry.

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