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碩士論文公告區 |
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| 年度： | 92 | |
| 姓名： | 林秉誼(Ping-yi Lin) | |
| 論文題目(中)： | 混凝土劣化後基本性質及修補後破裂韌性之研究 | |
| 論文題目(英)： | The Study of Fundamental Property and Repaired Fracture Toughness of Deteriorating Concrete | |
| 摘要(中)： | ||
| 台灣位於西太平洋強震區，又屬海島型氣候，在高溫、濕度、鹽害、中性化及硫化物等種種不良因素作用下，混凝土材料容易龜裂、侵蝕、風化及劣化。在以上問題之研究過程中，有關強度及破壞力學特性等議題，過去已有相當多的探討及成果，但較少有對長期劣化混凝土之破裂韌性進行研究，對於沿海環境之重要結構物，如核電廠混凝土之安全性及使用年限評估而言，此研究有其重要性。另外，對於混凝土劣化後的修復評估，則更顯示有實務上的需求及價值。 本研究主要在探討興建於沿海之電廠建築物，其混凝土經過人工海水乾溼反覆循環劣化過後之基本力學性質的變化。由試驗結果得知抗壓強度及波速整體趨勢來看，都有隨著齡期越長而控制組與劣化組間差異越大之趨勢。彈性模數則隨著齡期越長而有越高之趨勢，且在91天齡期前劣化組高於控制組，在180及360天齡期時控制組高於劣化組。在破壞性質上，FC配比之承載力無論劣化組或控制組都有隨著齡期越長而增加的趨勢，且劣化組均大於控制組；NC配比同樣都有隨著齡期越長而增加的趨勢，承載力修復指數除FC配比在56天齡期時較低約75.6％外，其餘皆接近100％，最高可達111.1％。在破裂能與齡期間之關係並無一明顯之趨勢，而破裂能之修復指數約在150％以上。在應力強度因子方面則有隨著齡期越長而越高之趨勢，且控制組皆高於劣化組，應力強度因子之修復指數最低可達90％。 |
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| 摘要(英)： | ||
| Concrete always deteriorates due to crack, corrosion, sulfate attack ,and so on, which take place more often in an marine environment. A plenty of research have been conducted dealing with the strengths and basic mechanical properties subjected to exposure environment while few have been done to study the fracture properties due to long term deterioration. It is valid and significant to figure out the fracture toughness of concrete, especially for those power plant structures which are located on the seashore. Furthermore, it is necessary to understand the restoration efficiency of crack on the deteriorated concrete. This research attempts on investigating the fracture properties of concrete used on the seashore structures for its deterioration after dry-wet corrosion process. The test results show that the variation of strength and wave velocity of those deteriorated concrete and those control set is getting larger as being cured longer. Elastic modulus, load capacity and KIC become higher as the curing duration is longer. In addition, those deteriorated concrete have higher in magnitude compared to those cured in water. But KIC can be restored up to 90％ after being repaired by epoxy. Fracture energy does show a clear trend, but it can be promote the ductility after being repaired. |
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| 檔案： | 沒有相關檔案 | |
| 相關連結： | http://ethesys.lib.cyut.edu.tw/ETD-db/ETD-search-c/view_etd?URN=etd-0811104-054029 | |