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Any material other than water, cement, or aggregate added to concrete immediately before or during mixing is considered an admixture. Admixtures are used to modify the properties of a concrete mix. They may be employed to speed or retard setting and hardening, to entrain air, to improve workability, or to reduce segregation of aggregate.

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palabras en el texto	palabras en el diccionario	significado en español
added	add	añadido
immediately
considered
admixtures
used
properties
setting

 

The characteristics of concrete vary widely, depending on the composition of the aggregate and the chemical and physical properties of the cement paste. The term cement, in its broader meaning, applies to any material that will bind two or more non-adhesive substances together. The cements to be considered here are those which have a limestone, oyster-shell, coquina shell, or similar lime base and are used to form concrete.

palabras en el texto	palabras en el diccionario	significado en español
widely
depending
broader
applies
considered