Abstract
Glass-ceramic to building material from glass cullet and concrete sludge was investigated. Batches were prepared by mixing a mass ratio of 50∼80 glass cullet, 20∼50 concrete sludge, 0∼30 aluminium oxide, 0∼4 iron sulfide, 0∼4 sodium sulfate, 0∼1 graphite, respectively. Black glass was produced by melting the batch at 1450 °C for 2 hours in a reducing atmosphere, and flowed on a steel plate. To form nucleation, this glass was reheated at 850 °C for 1 hour, and reheated at 1100 °C for 2 hours to form glass-ceramic. Results of the SEM observation and powder X-ray diffraction pattern of glass-ceramic showed wollastonite to be the main crystal, other crystals were nepheline and gehelenite.
