To provide a powdery cement admixture which is added to a cement material such as cement paste, cement mortar or concrete, which has excellent flow development and flow holding property regardless of the quality of aggregate to be used and which can be easily made powdery.
The powdery cement admixture is obtained by preparing a mixed aqueous solution in which a methacrylic acid based polymer aqueous solution (1) having a methacrylic acid derivative in a structural unit and a maleic acid based polymer aqueous solution (II) having an allyl alcohol derivative in a structural unit are blended in a solid blending ratio (I)/(II) of 95-55/5-45 (by mass ratio) and spray-drying the mixed aqueous solution to dry and make powdery.
COPYRIGHT: (C)2007,JPO&INPIT
TOHORI ETSUO
MAEDA KENICHIRO
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Masayoshi Kanda
Akio Miyao
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