Disclosed ratio of mass of water to the sum of the mass of the cement and the silica fume particles is 7-15 wt%, in an ultra high-strength hydraulic material composition using silica fume, have a sufficient fluidity, and good provision of Do a workability, and retarding hydraulic material composition capable of expressing a sufficient strength at a low wood age due to the reduction of.
A cement, aggregates, silica fume particulates, a water and polymer additives hydraulic material composition containing the average particle size of the silica fume particles is 0.01 to 0.5 m, cement and silica fume the ratio of mass of water to the sum of the mass of fine particles is 7-15 wt%, the polymer additives (I) component is constituted by a component (II) and (III) component, component (I), (II ) and the component (III) when the total weight of components was 100 mass parts, (I) :( II) :( III) = 3~20 parts by weight: satisfying the 45-70 parts by weight: 20 to 45 parts by weight hydraulic material composition.
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