| 摘要 |
PURPOSE:To obtain a hardened cement body having high bending strength without performing a stage of wet curing by kneading and molding a mixture consisting of portland cement, a water soluble high polymer and water and immediately performing heating and drying. CONSTITUTION:The aimed hardened cement body is obtained by kneading and molding a mixture consisting of portland cement, a water soluble high polymer and water and thereafter immediately performing heating and drying without performing set curing. As the used water soluble high polymer, polyacrylamide, a copolymer of acrylamide and sodium acrylate and tertiary ammonium salt of dimethylaminoethyl (meth)acrylate, etc., are especially preferably utilized. The above-mentioned drying is ordinarily performed by heating the molded body at 50 deg.-100 deg.C. It is decided by measuring weight of the sample that this drying has been completed or not. This drying is usually completed in 5-10 hours. |
