| 摘要 |
<p>PROBLEM TO BE SOLVED: To produce an aggregate utilizing a waste gypsum and excellent in mechanical strength without affecting hardening physical properties of a cement and to provide a method for producing the aggregate. SOLUTION: This aggregate utilizes a waste gypsum and is produced by covering the surface of a gypsum-based waste material such as a gypsum board with a hardened cement material subjected to a carbonating treatment. The method for producing the aggregate utilizing the waste gypsum comprises pulverizing the gypsum-based waste material, as necessary, granulating the resultant particles, then covering the surface with a cement-based raw material comprising a cement raw material and water, exposing the coated particles or grains to gaseous carbon dioxide under heating and pressurizing and carrying out a carbonating treatment.</p> |
