碩士 / 國立高雄海洋科技大學 / 海洋環境工程研究所 / 106 / In order to maintain the depth of water channels and wharf for ship navigation, huge amounts of harbor sediments are dredged and dumped into nearby ocean disposal site annually. These dredged sediments are a valuable resource that can be sold for reuse after being processed. However, dredged sediments are difficult to be reused directly for construction because they are mostly consist of high proportion of clay with limited strength, resulting in poor bearing the capacity and easy subsidence. The objective of this study is to enhance mechanical strength and bearing capacity of dredged sediment by admixing with steelmaking byproducts - basic oxygen furnace (BOF) slag. The physical and mechanical properties of the sediment-slag mixtures were examined by Proctor compaction test, California bearing ratio (CBR) test, compressive strength test, autoclave expansion test as well as SEM-EDS and XRD determination. The environmental compatibility of the sediment-slag mixtures was also assessed by toxicity characteristic leaching procedure (TCLP) and pH evolution test.
Results showed that the admixing technique for the reuse of dredged sediments coupled with BOF slag seems to be feasible. Dredged sediments admixed with BOF slag can effectively strengthen its bearing capacity and mechanical strength. When the admixing proportion of BOF slag reaches more than 30%, the CBR and compressive strength of the sediment-slag mixtures show a significant increase that was strong enough as aggregates for construction. In order to avoid the cracking problem caused by hydration-expansion, the admixing proportion of BOF slag in the sediment-slag mixtures should be kept lower than 40%. Toxicity characteristic leaching procedure extracts heavy metals from the sediment-slag mixtures at negligible levels.
| Identifer | oai:union.ndltd.org:TW/106NKIM0282001 |
| Date | January 2018 |
| Creators | CHANG ,CHIA-CHUN, 張家峻 |
| Contributors | CHEN, CHIU-WEN, 陳秋妏 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 103 |
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