| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a hydrothermally solidified article which has a large strength, by molding a raw material comprising collected macadam dust and a calcareous substance and then treating the molded product in an autoclave. SOLUTION: The collected macadam dust is obtained by collecting powder generated in a crushing process, and has an average particle diameter of 10 to 100μm. The calcareous substance includes slaked lime, quick lime and Portland cement. The collected macadam dust and the calcareous substance are used in a molar ratio (Ca/Si ratio) of 0.05 to 3 (converted into CaO and SiO2, respectively). A monosaccharide having a cyclic structure, such as xylose, glucose or fructose, is preferably used as a strength-increasing agent. The strength- increasing agent is used in an amount of 0.1 to 1 wt.% based on the total amount of the silicic substance and the calcareous substance in the raw material. The hydrothermally solidified article is produced by adding 3 to 20 pts.wt. of water to 100 pts.wt. of the raw material, mixing and molding the mixture and then treating the molded article in an autoclave at 110 to 220 deg.C for 1 to 20 hr. The molding method includes a press molding method and an extrusion molding method.</p> |
