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By R. A. Nixon, Corrosion Probe, Inc.
Historically, the coatings industry has specified 28 days of cure time for concrete before coatings are applied. This 28-day curing period was designated to address two key concerns: cement paste shrinkage continuing after coating application resulting in the formation of cracks and excess moisture unnecessary for cement hydration escaping from the substrate and causing problems at the coating/concrete interface. The author examines this “magic” number and presents real-world cases.
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