2017 年 71 巻 12 号 p. 1454-1461
In this study, we investigated reinforcement effect of micro-fibrillated cellulose（MFC）on composites prepared from paper sludge（PS）ash. The bending strength of MFC+PS ash composites was 1.5-5 times higher than that for PS ash only when additive rate of MFC was adjusted at 1, 3, 5, 10, 20, and 40％. The reinforcement effect of MFC on the composites was due to adhesive effect between PS ash particles coated with MFC. The bending strength of MFC 5+PS ash 95 composite was equal to the value of Japanese Industrial Standards for calcium silicate board（10 MPa）.
PS ash and wet MFC were mixed in equal amount of additive water to the solid content（PS ash+MFC solid）. The additive water（free water）was regulated depending on MFC content. The free water content in the compound had a large influence on PS ash hydration rate and the structure of resultant hydrate, consequently PS ash particles dispersion in MFC network varied by a combination of PS ash, MFC, and free water ratio. The increase in bending strength of PS ash+MFC composites may have decreased when free water content for PS ash was small.