| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a method of producing an extruded part, by which bending strength and toughness can be improved while maintaining high productivity, and to provide the extruded part used as a civil engineering structural member. <P>SOLUTION: The extruded part is produced by extruding under vacuum a mortar kneaded material containing cement, a pozzolana-based fine powder, aggregate, a quartz powder, needle-like particles, a polypropylene fiber, a water-soluble cellulose ether, a water-reducing agent, and water, and then subjecting the formed part to autoclave curing. A fiber having a specified size is used as the polypropylene fiber, and a water-soluble cellulose ether exhibiting viscosity of 10-100 Pa×s(20°C) when it is prepared as an aqueous solution of 2 mass % is used as the water-soluble cellulose ether. Further, the blending amounts of the water-soluble cellulose ether, the water-reducing agent, and water are 0.15-1.5 parts by mass, 0.3-0.7 parts by mass, and 20-30 parts by mass, respectively, to 100 parts by mass of the cement, and the blending amount of the polypropylene fiber is set to be 3-5 vol.%, based on the volume of the mortar. <P>COPYRIGHT: (C)2004,JPO</p> |
