| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a concrete composition for centrifugal force molding exerting high strength in regard to centrifugally molded concrete secondary products such as a pile, a pole or a Hume pipe and the like. <P>SOLUTION: In the high-strength concrete composition for centrifugal force molding containing ordinary portland cement, a high-strength additive, a dispersant, an aggregate and water, the containing ratio of gypsum hemihydrate in gypsum is 20-95 mass%, the containing rate of a gap phase is 17-23 mass% and the unit quantity of cement is 510-680 kg/m<SP>3</SP>in the ordinary portland cement, the high-strength additive contains anhydrous gypsum and noncrystalline silica wherein the mass ratio of anhydrous gypsum/noncrystalline silica is 15/85-90/10 and the dispersant is a naphthalene-based dispersant. <P>COPYRIGHT: (C)2009,JPO&INPIT</p> |
