水庫淤泥燒結製磚之可行性研究

Feasibility of Recycling the Reservoir Sediment as a Construction Brick by Sintering

江康鈺(Kung-Yuh Chiang) ； 簡光勵(Kuang-Lih Chien) ； 黃淑貞(Shwu-Jen Huang) ； 陳宜晶(Yi-Ching Chen)

《環境保護》 28卷1期 (2005/06) Pp. 1-13

https://doi.org/10.30017/EP.200506.0001

摘要

本研究嘗試利用燒結處理技術，探討改變燒結溫度及黏土添加比例之條件下，評估水庫淤泥燒結試體作為建築用磚之應用可行性。研究結果顯示，在燒結溫度低於800℃時，燒結顆粒尚未達到黏合及頸部成長現象，燒結試體無明顯之緻密化，導致燒結試體遇水則有崩解之現象。而當燒結操作溫度高於800℃時，隨燒結溫度之增加，其燒結試體之體積收縮率及密度亦現增加之趨勢；同時，由於試體之緻密化，其吸水率則隨燒結溫度增加而降低。另根據抗壓強度之結果顯示，燒結溫度增加，其燒結試體之抗壓強度亦明顯增加。至於添加不同比例黏土之燒結試體，經不同燒結溫度(1000℃~1150℃)之試驗結果顯示，隨著添加黏土比例增加，其在不同燒結溫度條件下，其密度及抗壓強度均有下降之現象，此係水庫淤泥中之化学組成已與黏土極為相似，即使改變添加黏土比例，亦無法有效提昇燒結試體之特性。燒結操作溫度高於1000，不論其黏土添加比例為何，水庫淤泥之燒結試體之抗壓強度均高於一級用磚標準，而其吸水率亦符合一般建築用磚規範；另一方面，燒結試體之重金屬溶出試驗(TCLP)濃度皆低於法規管制標準。綜合前述研究結果可知，應用燒結技術將水庫淤泥製成建築用磚均符合相關規範之規定，未來極具發展及應用之潛力。

關鍵字

燒結技術 ； 水庫淤泥 ； 建築用磚

並列摘要

In recognition of the trend toward an increased use of reservoir sediment as construction brick, the authors have investigated the feasibility of recovering reservoir sediment for use as bricks, by sintering reservoir sediment at variation of sintering temperature and clay additions. Experimental results indicate that the densification of sintered specimen have no significantly below sintering temperature 800℃, possibly owing to the interaction among thermal expansion, collision, and neck growth of particle change during sintering process. However, elevating the sintering temperature to 800℃, increasing the sintering temperature increases the shrinkage and apparent density of sintered specimens. Sintering at high temperature may enhance densification and decrease the moisture adsorption rate. Meanwhile, the moisture adsorption rate decreases with increasing sintering temperature. The compressive strength of the sintered specimens increased with increasing sintering temperature and fulfilled the co de requirement with respect to bricks for the construction. The experiments conducted ranging from 1000℃ to 1150℃ with clay addition contents varying from 0% to 20% indicate that an increase in clay addition content decrease the apparent density and compressive strength. On the other hand, the metals concentrations of the leachate from the Toxicity Characteristics Leaching Procedure (TCLP) test are all complying with the current regulatory limits. The above results point toward the feasibility of recycling the reservoir sediment as a construct ion brick by sintering.

並列關鍵字

Sintering ； Reservoir sediment ； Construction brick