No.5（2002）21.Glass-ceramic as building material using municipal solid wastes

Hidemi KOYAMA, Minoru TANAKA, Kazuhiro OOKUBO and Shigeru SUZUKI

Glass-ceramic as building material made using municipal wastes was investigated. Batches were prepared by mixing a mass ratio of 50-80 glass cullet, 20-50 concrete sludge, 0-30 aluminum oxide, 0-4 iron sulfide, 0-4 sodium sulfate, 0-1 graphite, respectively. Black glass was produced by melting the batch at 1450℃ for 2 hours in a reducing atmosphere, and flowing on a steel plate. To form nucleation, this glass was reheated at 850℃ for 1 hour, and reheated at 1100℃ for 2 hours to form glass-ceramic. Results of the SEM photograph and powder X-ray diffraction pattern of a glass-ceramic showed wollastonite ( CaO・SiO₂ ) to be the main crystal, other crystals were nepheline ( Na₂O・Al₂O₃・2SiO₂ ) and gehelenite ( 2CaO・Al₂O₃・SiO₂ ). The characteristics of the glass-ceramic were studied and compared with those of the marble. Leaching test results of the glass-ceramic satisfied the Japanese regulatory leaching test (JLT-46).

Keywords
Glass-ceramic, Glass cullet, Concrete sludge, Wollastonite, Wastes

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