無機聚合物置換或添加水庫淤泥之性能探討

On the Performance of Geopolymer Replacing and Adding Reservoir Sludge

林紹洲(Shao-jhou Lin)

指導教授 ： 吳傳威

國立臺北科技大學/工程學院/土木與防災研究所/碩士(2013年)

https://doi.org/10.6841/NTUT.2013.00458

摘要

臺灣水庫淤積嚴重，清淤處理及運棄不僅成本高且淤泥易造成二次污染。近年無機聚合物材料之研究發展蓬勃，性能逐漸受到肯定，然其成本仍是主要競爭弱點。在其配比之固形成分中包含的變高嶺土，不但價格高且不環保，如果可以採用水庫清淤的淤泥廢棄物來置換變高嶺土或直接添加於無機聚合物中，成效頗值期待。本研究之內容除包含分別將原型與經焙燒後之水庫淤泥以不同比例取代變高嶺土或直接添加方式，製成無機聚合物試體進行抗壓強度試驗。另外亦探討將前述試體再經煆後之強度。結果顯示以水庫淤泥取代變高嶺土之無機聚合物抗壓強度皆超過原配比者，尤其以取代量75%者表現最好。經過650℃焙燒3小時之水庫淤泥，不論任何比例取代量，其強度都低於未焙燒者，早期強度甚至不如原配比。而再經煆燒後試體因裂縫不易控制，其試驗數據不穩定，但其強度仍明顯有低於未經煆燒者之趨勢。本研究之成果對於水庫淤泥的出路有正面的提示，並初步可知，使用高溫焙燒或煆燒似皆尚屬無謂。

關鍵字

水庫淤泥 ； 無機聚合物 ； 抗壓強度

並列摘要

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.

並列關鍵字

Reservoir sludge ； Geopolymer ； compressive strangth

參考文獻

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