| Summary: | 碩士 === 國立成功大學 === 資源工程學系碩博士班 === 93 === With the rapidly depositing sludge in reservoirs of Taiwan, proper and economical disposal of sludge in reservoirs has become an urgent subject confronted by Taiwan. The chemical composition of sludge in the reservoir is mostly SiO2, Al2O3, Fe2O3, K2O, which could make the major composition of lightweight aggregate. This research hopes obtain light weight, porous, high strength lightweight aggregate under proper sintering conditions.
This research investigated the sintering behavior of sludge in Tseng Wen Reservoir for lightweight aggregates, by sintering and promoting bloating the bulk made of sludge under controlled conditions of varying temperature, time. SEM, XRD, MTS, DTA, Ta-Mass techniques were used to examine the thermal treatment properties, including the bloating mechanism, microstructure, and crystalline variations.
As for the compressive strength of lightweight aggregates which is about 33MPa∼7MPa under sintering temperature 1250℃∼1300℃. Follow in BCA ( British Cement Association ) procedure to estimate lightweight aggregates, the value of strength/weight is 1.96 under sintering condition 1250℃/2hours. And the lightweight aggregates that this research investigated are already enough to use for the construction.
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