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Ecodur 201: Coating a Concrete Brine Tank at the Olympic Oval (Ener-Spray)

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Salt water, whether in brine or marine concentrations, is tough on concrete and steel structures. Unprotected steel deteriorates at an extremely high rate and concrete much more slowly. Typically, protection for both is provided by epoxy coatings that work well provided they are not subjected to thermal, mechanical or particularly aggressive chemicals as often encountered in the fracking industry.

This case study concerns a brine tank in one of North America’s premier Olympic standard ice sports arenas where the original protective coating on concrete and steel piping had failed and was threatening to result in extremely costly damage had no remedial action been taken.

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Problem
Whilst not fully understood as to how the salts, principally sodium chloride in sea water, degrade concrete, a number of factors arising from exposure to salt are known to directly contribute to its deterioration. Salt is slightly acidic and lowers the pH of concrete leading to increased porosity and ingress of additional water and chemicals into the concrete.

Brine can ultimately meet the internal steel reinforcing, rapidly accelerating corrosion. External piping, as in this case, were prime targets for corrosion. The concrete and piping had been coated with a conventional epoxy but it had failed.

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Solution

Ecodur was chosen because it has a 20-year plus real world application on ship decks and garages highly exposed to salt. Furthermore, underwater saltwater tests have shown no measurable deterioration whatsoever. Additionally, the coating retains its adhesion qualities and flexibility. Although not required, Ecodur also has an ANSI NSF-61 potable water rating.

Ecodur is free of Volatile Organic Compounds and does not require the use of solvents at any point, either in content, application or for clean-up. This means it is safe to use in confined spaces as long as standard safety gear is worn and application criteria are followed. This brine tank was a confined space and all surfaces had to be fully reduced to a bare state, including the steel piping.

Application Results

The Ecodur was applied by ENER-SPRAY Industrial Solutions Ltd. A thickness of 60 mils was deemed appropriate for the brine tank because of the corrosive nature of the liquid. Unlike many conventional epoxy coatings, there is no limit to the thickness that Ecodur can be applied. Frequently holes and gaps need to be dealt with and rapid setting Ecodur is ideal for filling anomalies to any depth required.

Surface tack-free state was achieved in the standard period of approximately 30 minutes and full cure was completed after 24 hours, at which point a final inspection was made. No anomalies were detected and the brine tank room was released for immediate use.

Had there been any touch ups required, Ecodur has the unique ability to fully bond to previously applied Ecodur surfaces, no matter how long ago were applied. With Ecodur’s adhesion being close to double that of conventional epoxy coatings, this means that repairs can be confined to immediate repair areas rather having a much larger surface prepped again.
The client in this case study had required anonymity, but had expressed complete satisfaction with the coating work.

For more information on our coating product and services, please contact us at info@castagra.com or 1 (888) 388-2935 (Toll Free US/Canada).