Cement additive
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United States of America Patent
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Jul 13, 2004
Grant Date -
N/A
app pub date -
Nov 5, 2001
filing date -
Feb 15, 1999
priority date (Note) -
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Abstract
A cement additive comprising a polycarboxylic acid type copolymer and/or a salt thereof and a polyalkylene glycol derivative, wherein said polycarboxylic acid type copolymer contains one or more species of copolymers composed of at least an unsaturated polyalkylene glycol type monomer and an unsaturated mono- or dicarboxylic acid type monomer as their monomer components. Concretes in which the additive is used have excellent flow, without significant retarding effect, and a low air entrainment. When used with concrete for steam curing it allows earlier removal of form work.
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