refractory shotcrete

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shotcrete — or gunite Concrete applied by spraying. Shotcrete is a mixture of portland cement, aggregate, and water conveyed by compressed air to a spray gun. For structural uses, shotcrete is usually sprayed over a framework of reinforcing bars and steel… … Universalium
Types of concrete — There are many types of concrete, variations of installation, composition, finish and performance characteristics. A highway paved with concrete … Wikipedia

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