Effect of High Dosage of a Set Retarder on the Properties of Fresh and Hardened Concrete

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Title: Effect of High Dosage of a Set Retarder on the Properties of Fresh and Hardened Concrete

Author(s): S. Nagataki and T. Takeuchi

Publication: Special Publication

Volume: 173

Issue:

Appears on pages(s): 719-742

Keywords: Compressive strength; retardants; setting (hardening); slump tests; superplasticizers

Date: 9/1/1997

Abstract:
The diversity of concreting methods in recent years has led to a demand for long retardation of concrete setting. Conventional research has achieved retardation for up to about 3 days by the addition of a set retarder, but few studies have dealt with concrete that is placable after a much longer period. This paper reports the effects of the set-retarder dosage and temperature on the slump, period of set retardation, time limits for superplasticizing and compressive strength of concrete. The use of concrete with long-retarded setting is discussed as well.