| 摘要 |
<p>PROBLEM TO BE SOLVED: To obtain the subject composition having excellent extrusion moldability to efficiently prevent the development of color shading, free from crack and having improved dimensional stability. SOLUTION: This cement composition for extrusion molding is composed of 100 pts.wt. of a cement containing 60-70 pts.wt. of belite (2CaO.SiO.) and having a Blaine fineness of 3,000-3,500cm<2> /g, 10-30 pts.wt. of fine silica powder, 15-20 pts.wt. of fine aggregate, 10-15 pts.wt. of wollastonite, 1-3 pts.wt. of a cellulose derivative as a thickener and the remaining part of water. The cement composition is extrusion-molded and cured in an autoclave.</p> |
