| 摘要 |
<p>PURPOSE:To efficiently utilize burnt ash generating in a fluidized combustion furnace as a production raw material of an inorganic board material by molding a cement-mixed composition containing quartz sand and ash in fluidized bed to a board-like in the presence of water and hardening by curing. CONSTITUTION:In a cement mixture in which a mixing ratio of quartz sand as a silica source and cement is about 1:1 and the necessary adding materials such as a reinforcing fiber and a light weight aggregate are added, 5-50wt.% of said quartz sand is substituted with ash in a fluidized bed. Said cement-mixed composition is molded to a board-like in the presence of water and hardened by curing to afford the objective inorganic board. A substituted amount of said ash in a fluidized bed is set as 5-50wt.% of mixing amount of quartz sand because, in a case of <=5wt.%, reaction by quartz sand becomes more stronger and hardness of a product is higher, then the improving effect on workability becomes insufficient. On the other hand, in a case of >=50wt.%, degree of strength impartment by the silica source becomes lower and necessary strength as a building material is not obtained.</p> |
