| 摘要 |
PROBLEM TO BE SOLVED: To provide a naphthalene-based water-reducing agent capable of giving outstanding flow retention effectiveness and strength development effectiveness for a hydraulic composition. SOLUTION: The water-reducing agent for a hydraulic composition includes a naphthalenesulfonic acid-formaldehyde condensate which has a weight average molecular weight of 1,900-24,000 as determined by GPC and in which the peak area of a molecular weight of 4,000 or below as determined by GPC is 17 to 38% of the whole peak area as determined thereby. COPYRIGHT: (C)2010,JPO&INPIT |
