To obtain an additive capable of imparting fluidity and fluidity-keeping properties even to fine aggregates produced at any place by including a vinyl- based polymer having an oxyalkylene group having specific numbers of carbons in a molecule, and a specified average molecular weight, and a cationic compound having a tertiary N atom.
This additive comprises a vinyl-based polymer having a 2-3C oxyalkylene group in a molecule, and 500-500,000 number average molecular weight (e.g. methanol-EO-monoester of methacrylic acid/Na acrylate), and a cationic compound having a tertiary N atom, preferably a compound having an 8-36C hydrophobic group and/or of formulas I-V (R1 and R2 are each a 10-24C alkyl, an alkenyl or a β-hydroxyalkyl; R3 to R5 are each a 1-5C alkyl, a hydroxyalkyl, benzyl or the like; R6 is an 8-36C alkyl, an alkenyl or a β- hydroxyalkyl; X1 is a counterion; Y1 is R6, R6COOCH2, R6CONHCH2 or R6OCH2).
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SHIROTA KYOICHI
YAMATO FUJIO
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