Title :
Recycle of inorganic wastes by hydrothermal technology
Author :
Oida, Mikihiro ; Maenami, Hiroki ; Isu, N. ; Ishida, Emile H.
Author_Institution :
INAX Corp.
Abstract :
In order to build up a sustainable society, the authors have investigated the recycling technology of inorganic wastes with low energy consumption. Sewage sludge ash, concrete waste, and construction sludge were used as raw materials. These waste were mixed with Ca(OH) 2 and formed by uniaxial pressing. The specimens were autoclaved for 6 h at 180degC under saturated steam pressure. The flexural strength of the specimens varied from 3.2 to 9.4 MPa with the bulk density of 1200 to 1550 kg/m3. The strength development was caused by filling of the initial void among the particles with tobermorite (Ca5(Si6O18H2)middot4H 2O) and hydrogarnet (Ca3Al2(SiO4 )(OH)8) formed by hydrothermal treatment. To apply these solidified inorganic waste to paving tile, determined that Ca(OH) 2/wastes mass ratio is 15/85 for plant production condition. The paving tile had comparable performance with brick, block and concrete pavement
Keywords :
bending strength; brick; calcium compounds; concrete; industrial waste; recycling; sewage treatment; sustainable development; tiles; (Ca3Al2(SiO4)(OH)8); (Ca5(Si6O18H2 )middot4H2O); (Ca5(Si6O18H2)H2 O); 180 C; 6 hrs; Ca(OH)2; brick; bulk density; concrete waste; construction sludge; energy consumption; flexural strength; hydrogarnet; hydrothermal technology; inorganic wastes; paving tile; plant production condition; raw materials; recycling technology; sewage sludge ash; steam pressure; sustainable society; tobermorite; uniaxial pressing; Ash; Building materials; Chemicals; Concrete; Energy consumption; Pressing; Recycling; Tiles; Waste materials; X-ray scattering; flexural strength; heavy metal fixation; hydrothermal treatment; paving tile; waste;
Conference_Titel :
Environmentally Conscious Design and Inverse Manufacturing, 2005. Eco Design 2005. Fourth International Symposium on
Conference_Location :
Tokyo
Print_ISBN :
1-4244-0081-3
DOI :
10.1109/ECODIM.2005.1619231
