TY - GEN
T1 - Recycle of inorganic wastes by hydrothermal technology
AU - Oida, Mikihiro
AU - Maenami, Hiroki
AU - Isu, Norifumi
AU - Ishida, Emile H.
PY - 2005
Y1 - 2005
N2 - 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 180°C 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)·4H 2O) and hydrogarnet (Ca3Al2(SiO 4)(OH)8) formed by hydrothermal treatment. To apply these solidified inorganic waste to paving tile, we 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.
AB - 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 180°C 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)·4H 2O) and hydrogarnet (Ca3Al2(SiO 4)(OH)8) formed by hydrothermal treatment. To apply these solidified inorganic waste to paving tile, we 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.
KW - Flexural strength
KW - Heavy metal fixation
KW - Hydrothermal treatment
KW - Paving tile
KW - Waste
UR - http://www.scopus.com/inward/record.url?scp=33947097874&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=33947097874&partnerID=8YFLogxK
U2 - 10.1109/ECODIM.2005.1619231
DO - 10.1109/ECODIM.2005.1619231
M3 - Conference contribution
AN - SCOPUS:33947097874
SN - 1424400813
SN - 9781424400812
T3 - Proceedings - Fourth International Symposium on Environmentally Conscious Design and Inverse Manufacturing, Eco Design 2005
SP - 304
EP - 305
BT - Proceedings - Fourth International Symposium on Environmentally Conscious Design and Inverse Manufacturing, Eco Design 2005
T2 - 4th International Symposium on Environmentally Conscious Design and Inverse Manufacturing, Eco Design 2005
Y2 - 12 December 2005 through 14 December 2005
ER -