| Summary: | 碩士 === 國立臺北科技大學 === 土木與防災研究所 === 101 === In Taiwan, many water reservoirs have the serious problem of silting up. The cost of dredging and disposal is high, and not to mention the further problem of second pollution. Geopolymer is a material still under development, its properties has been affirmative. However, its main weakness in compete with the others is the cost. One of the solid compositions in the formulation of geopolymer is metakaolin, high in price and not good for environmental protection. If this material can be replaced by the sludge, waste from reservoir dredging, or direct adding into geopolymer, the benefit may be worth expectation. The present study thus at first made geopolymer specimens by replacing metakaolin with either original or baked sludge, and tested their compressive strength. Furthermore, the so made specimens were baked again and then do the same. The results showed that the compressive strength of the geopolymer with metakaolin replaced by the non-baked sludge were higher than those with original formula, especially the ones with 75% replacement of metakaolin. None of the specimens with baked sludge had better strength than non-baked ones. Their early strength even worse than the ones with original formula. As for the baked again specimens, their strength data were quite unstable might be due to the difficulty of controlling the cracks in the specimens during the experiment. Nevertheless, the overall strength was tent to lower than those of non-baked ones. It is seen that the results of the present work gave a positive view for the prospect of the sludge. On the other hand, it also told that baking the material might not always be helpful.
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