bugholes

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Bughole-induced outgassing — is a phenomenon occurring when applying a protective coating (or lining) to concrete (predominantly vertically cast in place) where air becomes entrapped within bughole cavities and releases into or through the protective coating, thereby causing … Wikipedia
Parge coat — (concrete): A thin coat of a cementitious or polymeric mortar applied to concrete for refinement of the surface. The typical parge coat is 1/32 1/16 in thickness; this may be less than the minimum thickness allowed by many mortars types.The… … Wikipedia

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