| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a concrete admixture by the use of which concrete capable of exhibiting high levels of dispersion properties, dispersion retentivity and initial strength can be produced under wide concrete production conditions. SOLUTION: This concrete admixture comprises: copolymer (I) formed of a monomer mixture containing a specific polyoxyalkylene glycol ester-based monomer (a) and a specific carboxylic acid-based and/or sulfonic acid-based monomer(s) (b) in a (b)/[(a)+(b)]×100 ratio in the range of 1-30 (wt.%); and a copolymer (II) formed of another monomer mixture containing the monomer (a) and the monomer(s) (b) in a (b)/[(a)+(b)]×100 ratio in the same range as above but different from the above ratio.</p> |
