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Expansions of mortar bars, stored over (but not in) water after simulated steam curing to 85 o C, were related to certain cement compositional parameters. The relationship is expressed in the form of a ''delayed ettringite formation (DEF) index.'' The DEF index is computed as the joint product of the SO 3 /Al 2 O 3 molar ratio of the cement, the sum of its SO 3...
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