台灣地區因自然及人為因素導致水庫淤積快速，現階段水庫浚渫後之淤泥多以棄置處理，此法不但不符經濟效益且易造成二次污染，若能予以資源化利用，可達到環境與經濟的雙贏效果。淤泥本身具有燒製輕質骨材的潛力，輕質骨材具有質輕、強度及耐燃等優良性質，可替代傳統砂石，乃淤泥處理的良好出路。
本研究以石門水庫淤泥為樣品，經成分分析符合燒製輕質骨材之條件。將淤泥前處理得到含水量30%之濕料(W系列)與乾料(D系列)，添加高濃度NaOH混合造粒，燒製階段分為直接燒製與120℃預熱一小時後燒製。
研究結果發現添加NaOH能降低兩系列製程的燒製溫度，在1085~1045℃，W系列能得到體密度1.147~1.606g/cm3，抗壓強度1.72~21.07Mpa的燒結體；D系列能得到體密度1.012~1.377 g/cm3，抗壓強度1.68~7.89Mpa燒結體，皆符合輕質骨材標準。而W系列燒結體之性質與D系列燒結體相近，證實了以濕料直接燒製輕質骨材的可行性。添加NaOH和濕料直接燒製可降低技術及原料處理成本，有助於推廣淤泥燒製輕質骨材。

Reservoir sludge(sediments) is a common problem in Taiwan that damages the volume of Reservoirs , production of lightweight aggregates (LWAs) from reservoir sludge is a proper way to save their life. Instead drying and firing cost a lot on preparing LWAs. The purpose of this study is to prepare LWAs with NaOH addition to eliminate drying process and lower the firing temperature.
The experiment primarily studies the feasibility of LWAs made by reservoir sludge with NaOH addition. The sediments included the water content of 30%. The physical properties of sludge–made LWAs were measured. XRD, DTA, OM, SEM and MTS were used to examine the characterizations, including mineral phase, bloating mechanism, microstructure and compressive strength.
The bulk densities of sludge–made LWAs ranged between 1.14 g/cm3 and 1.60 g/cm3, and the compressive strengths ranged between 1.72 MPa and 21.07 MPa. The physical properties of sludge–made LWAs all meet the regulations for LWAs.
The results show it is feasible to prepare LWAs from reservoir sediment without drying by NaOH addition which can lower firing temperature in the range between 1085℃ and 1145℃. This method can greatly reduce the cost on LWAs production and further promote their applications on building industry.

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