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This study was carried out according to two series of experiments. The first series of experiment, green aggregates, which is a mixture of sewage sludge and clay, with different content of sewage sludge (up to 80 wt%), were prepared and the second series of experiments belongs to green aggregates contain amount of fly ash up to 20wt% in replacement of clay. Then they were burned in different soak temperatures from 1200'C to 1280'C with fixed soak time and fixed heating rate at 5 minutes and 20°C/min respectively in order to produce lightweight aggregate (L W A). Data of both experiment series were generated to evaluate the quality of L W A as well as the relationship between burning condition and product's quality. As the result, by adding clay and fly ash to sewage sludge, LWA used for non-structural concrete is successfully manufactured with relatively high content of sewage sludge (60-80wt%). Generally, the quality of LWA containing fly ash is better than that of LWA containing only clay. Especially, the strength of L W A is much improved when fly ash is added and the quality of aggregate contains fly ash is comparable with that of Spain aggregate. The parameters used for controlling the quality of L W A such as soak temperature as well as its chemical composition show directly proportional influence in a narrow limit. Thus, additive studies should be carried out in order to successfully produce LWA in industrial scale.

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UCI(KEPA) : I410-ECN-0101-2009-540-014282679