水化副產石灰應用於軟弱土壤改良之研究

NCU Institutional Repository > 工學院 > 土木工程研究所 > 博碩士論文 > Item 987654321/60422

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题名:	水化副產石灰應用於軟弱土壤改良之研究
作者:	徐永翰;Hsu,Yung-Han
贡献者:	土木工程學系
关键词:	水化副產石灰;土壤改良;加州載重比;水化程度;HCFB;soil improvement;CBR;hydration degree
日期:	2013-07-23
上传时间:	2013-08-22 11:36:58 (UTC+8)
出版者:	國立中央大學
摘要:	循環式流體化床鍋爐燃燒過程中，加入石灰石脫硫後大量產生之副產物CFB副產石灰(含粉狀、粒狀)，為避免出廠後產生揚塵及方便搬運，故以浸水24 hr作為處理，使其形成水化副產石灰並堆放於戶外堆置場存放。因長期以來未能有效將其利用及去化，大量堆放下所引致堆置用地、處理費用與環保等相關問題，故而考慮將水化副產石灰作為改良軟弱土壤之改良劑。本研究將水化副產石灰搭配六輕隔離水道疏濬土，在不同比例下探討各配比在標準夯實試驗、加州載重比試驗之工程性質，同時評估混合料在浸水環境下潛在的膨脹行為。試驗結果顯示，在添加水化副產石灰下，混合料之承載能力有明顯提升之情形；然而膨脹潛能試驗中，由於水化副產石灰含有大量石膏，且疏濬土本身也具有膨脹性，受材料特性影響而具有吸水膨脹及水化反應之行為，使混合料試體存在不穩定之因素，但水化副產石灰用量增加，有減緩膨脹量之效果。最後透過水化程度試驗進一步探討水化副產石灰膨脹行為，研判混合料之膨脹與其水化未完成有關。 In Circulating fluidized bed boiler combustion process, adding a lot of limestone desulfurization byproducts generated from CFB (including fly ash, bed ash), after leaving the factory in order to avoid generating dust and easy moving, so soak those ashes in water for 24hr stable treatment,, to form Hydration Circulating Fluidized Bed ash (HCFB) and placed on the sites for outdoor storage. Due to its long-standing failure to effectively utilize and to melt, a large stacked arising under land disposal costs associated with environmental protection and other issues, so consider the HCFB as a improvers of improved soft soil. In this study, in different proportions to mix HCFB and waterway dredging soil, explore the standard compaction test and the California load ratio test (CBR) of the nature of the works, while assessing the mixture in the immersion environment potential expansion behavior. The results show that the mixture adding HCFB can obvious enhance carrying capacity however, in the expansion test, due to HCFB contains large amounts of gypsum, and the dredged soil itself also has expansibility, affected to the impact of material properties, has expansion and hydration reaction of conduct, so that the mixture specimens exist unstable factors, but increased using HCFB has the effect of slowing the amount of expansion. Finally, by the degree of hydration test to further explore expansion behavior of HCFB, judged mixture of hydration did not complete.
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