To obtain a concrete admixture excellent in dispersibility, the fluidity holding property of concrete or the like by incorporating a water soluble copolymer of a specific monomer and a copolymerizable monomer or its water soluble salt as essential components.
The water soluble copolymer or its water soluble salt is produced by copolymerizing a monomer expressed by the formula (AO is a 2-3C oxyalkylene and (n) is 50-300 in average) and a monomer copolymerizable with the monomer. And the concrete admixture is obtained by incorporating the water soluble copolymer (salt) as an essential component and as necessary, blending additives such as a high performance water reducing agent, a fluidizing agent and a foaming agent. Further, the monomer expressed by the formula is a polyalkylene glycol monoallyl ether and is obtained by addition-reacting ethylene oxide or propylene oxide to an allyl alcohol. And as the copolymerizable monomer, maleic acid, citraconic acid or a monomer obtained by introducing a 2-3C oxyalkylene group to these acids is suitably used.
KITAGAWA KAZUE
HONMA YUICHI
