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Retardation of concrete due to zinc contamination

Retardation of concrete due to zinc contamination

Retardation of concrete due to zinc contamination

(OP)
Has anyone any definitive data on maximum levels of zinc salts that can be tolerated in concrete before excessive retardation is encountered. We have a local limestone that contains zinc impurities in some seams and need to know when not to use the incomong material.

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