The use of vitreous enamel coatings

Many reinforced concrete structures on Army installations represent critical assets that are vital to storing, maintaining and transporting vehicles and material needed to support the warfighter. Unfortunately reinforced concrete can have a short service life if the reinforcement steel in the concrete corrodes.

A series of new vitreous enamel coatings that contain hydraulically-reactive calcium silicates and aluminates have been developed to provide additional protection for the steel and to increase the service life of reinforced concrete structures. The new series of vitreous enamel coatings combine a layer of alkaline- resistant basecoat vitreous enamel
with an outer coating of vitreous enamel
that incorporates dicalcium silicate, tricalcium silicate and calcium aluminate and alumino-ferrite. The basecoat protects the steel while the calcium silicates in the outer layer hydrate when placed in fresh concrete and chemically bond to the surrounding concrete paste.

The bond strength between the concrete and steel is increased two to three times that developed with uncoated steel. The enamel over the steel produces durable corrosion protection. Tests with steel stay-in-place forms demonstrate the usefulness of the vitreous enamel coating steel.

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