| 摘要 |
An object of the present invention is to provide a polycarboxylic acid polymer for blending in cement for a cement composition superior both in dispersion and dispersibility-retention. The object was achieved by providing the present invention of a polycarboxylic acid polymer for blending in cement,
wherein
(1) the molecular-weight distribution curve of the polycarboxylic acid polymer is drawn by measuring the molecular weight distribution thereof with gel permeation chromatography and plotting elution times on the abscissa,
(2) a base line is drawn on the molecular-weight distribution curve,
(3) the elution-starting time, elution-ending time, and peak-top time of the peak corresponding to the polymer component are respectively designated as Lh, Ln, and Mp;
(4) Lm is calculated according to the following Formula (1): L m = ( L n + M p ) / 2
(5) the peak area between the elution times Lm and Ln is designated as P 0 and the peak area between the elution times Lh and Mp as Q 0 ,
P 0 and Q 0 satisfying the following Formula (2): 15 ‰¤ ( P 0 × 100 ) / ( P 0 + Q 0 ) ‰¤ 45 |
