Fight Corrosion in Concrete Potable Water Structures


What can be done when corrosion protection is needed in a reinforced concrete structure that holds drinking water or is located in an environmentally sensitive waterway? Due to the possibility of harmful chemicals leaching into water, contractors are limited on which products they can apply to concrete elements in contact with potable water. Fortunately, Cortec® Corporation offers a variety of Migrating Corrosion Inhibitor products that are certified to meet ANSI/NSF Standard 61 for use in drinking water system components.

Migrating Corrosion Inhibitors (MCIs) can be admixed into new concrete and repair mortar or topically applied to existing concrete as a surface applied corrosion inhibitor (SACI). MCI® molecules migrate through concrete pores and are attracted to metal surfaces, such as rebar, where they form a molecular protective layer considered to be ambiodic, or mixed, meaning it inhibits corrosion reactions at both the anode and cathode of a potential corrosion cell.

MCI® admixtures are sometimes desired for extra protection in potable water reservoirs, prefab pipe segments for transporting seawater to desalination plants, brine holding tanks, and seawalls in sensitive areas where there are leachate concerns.

MCI® SACIs are typically sprayed onto existing concrete and migrate deeper over time. They can be a great option when application errors in the construction of potable water holding tanks have left a thinner concrete cover than intended and additional corrosion protection is needed. They can also be used for periodic maintenance on structures (e.g., concrete water towers) that were not initially specified with MCI® admixtures but where there is a corrosion concern.

Corrosion in reinforced concrete structures leads to costly repairs, interrupting the intended use of the structure and potentially reducing its service life. Specifying an MCI® admixture in new drinking water system components can be an excellent way to slow down the natural deterioration processes of corrosion in drinking water system components where higher safety standards exist.

Source: Cortec® Corporation

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