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完整後設資料紀錄
DC 欄位 | 值 | 語言 |
---|---|---|
dc.contributor.advisor | 廖文正 | zh_TW |
dc.contributor.advisor | Wen-Cheng Liao | en |
dc.contributor.author | 鍾文國 | zh_TW |
dc.contributor.author | Wen-Guo Chong | en |
dc.date.accessioned | 2023-08-15T17:52:20Z | - |
dc.date.available | 2023-11-09 | - |
dc.date.copyright | 2023-08-15 | - |
dc.date.issued | 2023 | - |
dc.date.submitted | 2023-08-04 | - |
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H. Wittmann、趙鐵軍,「靜水壓力下混凝土中氯離子傳輸機理研究」,碩士論文,青島理工大學土木工程學院,2011。 [144] 趙國藩、彭少民、黃承達,「鋼纖維混凝土結構」,中國建築工業出版社,北京,1999。 [145] 蔡立倫,「含腐蝕鋼筋之鋼筋混凝土梁耐震行為」,碩士論文,國立台灣科技大學營建工程學系,2010。 [146] 蔡得時,「利用氯化物之滲透評估混凝土在海洋環境之品質及保護層之厚度」,防蝕工程,6(2),47-56,1992。 [147] 鍾惠玲,「不同劣化環境對結構用鋼腐蝕行為影響之研究」,碩士論文,中華技術學院土木防災工程研究所,2007。 [148] 戴群軒,「混凝土內鋼筋腐蝕與氯離子濃度之研究」,碩士論文,臺灣大學土木工程學研究所,2012。 | - |
dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/88808 | - |
dc.description.abstract | 如今許多文獻中已經證實鋼纖維的添加能解決高強度混凝土脆性破壞的模式,同時還能提升試體之韌性表現。台灣長年處於潮濕且高溫的環境,且結構構件長期承受工作載重下難免會產生裂縫,這樣的條件下會使外界氯離子更容易沿著裂縫進入到混凝土內部侵蝕鋼筋,進而影響結構的使用性及耐久性。
於是本研究以不同水灰比及鋼纖維取代率作為主要參數將鋼纖維混凝土梁經預裂後產生工作裂縫再放置於大氣中及鹽霧室進行加速劣化長達約2000天來探討真實環境下添加鋼纖維之混凝土梁經長期劣化後之殘餘力學行為,同時探討受腐蝕後之鋼纖維對於限制裂縫及內部鋼筋腐蝕所帶來的影響。另外一項實驗為貯鹽試驗,同樣以不同鋼纖維取代率作為設計參數製作試體,接著於試體上方蓋圍堰浸泡NaCl溶液長達約2000天,透過比色法及氯離子滴定來探討內部氯離子之擴散行為,同時也能將這兩種不同加速腐蝕方法之結果來作比較。 由貯鹽試驗的結果發現,試體之擴散係數有隨著鋼纖維取代率增加而下降的趨勢,表示鋼纖維的添加不僅不會破壞高強度混凝土原有良好抵抗氯離子的能力,反而會提升混凝土內部的緻密性,且隨著鋼纖維取代率的增加其阻隔氯離子侵入之效應會更加明顯,大幅提升了混凝土之耐久性。鹽霧加速劣化試驗的結果中顯示,預裂後放置於大氣中或是鹽霧室進行加速劣化之梁試體其力學行為並沒有明顯的下降,其原因為氯離子沿著裂縫進入到混凝土內部侵蝕鋼筋僅造成局部腐蝕的狀況,其餘未開裂處之鋼筋仍然能發揮良好的握裹力才導致殘餘強度沒有顯著的變化。 | zh_TW |
dc.description.abstract | Many studies have verified that the addition of steel fibers can solve the brittle failure mode of high strength concrete and improve the toughness performance of specimens. Taiwan has been in a humid and high temperature environment for many years, and structural components are subjected to long-term loading, which inevitably leads to crack formation. Under such conditions, chloride ions from the environment can more easily penetrate into the concrete through cracks, corroding the reinforcement and affecting the serviceability and durability of the structure.
Therefore, different water-cement ratios and the addition of steel fiber were used as the main parameters. Steel fiber-reinforced concrete beams with pre-cracking were placed in the atmosphere and a salt spray chamber for accelerated deterioration for approximately 2000 days. The aim was to investigate the residual mechanical behavior of steel fiber-reinforced concrete beams after long term deterioration in real environmental conditions, and to explore the influence of corroded steel fibers on crack restriction and internal steel corrosion.Another experiment conducted was the ponding test. Similarly, specimens were designed with different addition of steel fiber, and then immersed in NaCl solution for approximately 2000 days, using colorimetric method and chloride ion titration to investigate the diffusion behavior of internal chloride ions. This also allowed for a comparison of the results between these two different accelerated corrosion methods. The results of the ponding test showed a decreasing trend in diffusion coefficient with an increasing steel fiber, indicating that the addition of steel fibers not only does not compromise the ability of high-strength concrete to resist chloride ions but also enhances the density of the concrete and the effect of blocking chloride ion penetration, significantly improving the durability of the concrete. The results of the accelerated deterioration test in the salt spray chamber and in the atmosphere showed no significant decrease in the mechanical behavior of the cracked beams. This is because the ingress of chloride ions into the concrete through cracks only causes partial corrosion of the reinforcement, while the non-cracked reinforcement maintains good bonding, resulting in no significant change in residual strength. | en |
dc.description.provenance | Submitted by admin ntu (admin@lib.ntu.edu.tw) on 2023-08-15T17:52:20Z No. of bitstreams: 0 | en |
dc.description.provenance | Made available in DSpace on 2023-08-15T17:52:20Z (GMT). No. of bitstreams: 0 | en |
dc.description.tableofcontents | 誌謝 i
摘要 iii ABSTRACT iv 目錄 vi 表目錄 xi 圖目錄 xiv 照片目錄 xxi 第一章、緒論 1 1.1 動機與目的 1 1.2 研究內容與方法 2 1.3 研究流程 3 第二章、文獻回顧 4 2.1 高強度鋼筋混凝土介紹 4 2.1.1 高強度混凝土 4 2.1.2 高強度鋼筋 6 2.2 端鉤型鋼纖維之拉拔行為 6 2.2.1 添加鋼纖維於混凝土對於力學行為的影響 6 2.2.2 端鉤型鋼纖維之拉拔機制 13 2.2.3 端鉤型鋼纖維拉拔能量之預測模型 14 2.2.4 等效握裹強度 21 2.3 孔隙結構 22 2.3.1 混凝土之孔隙結構 22 2.3.2 鋼纖維與漿體之界面微觀結構 24 2.3.3 水灰比與養護齡期的變化所形成之孔隙結構 25 2.3.4 卜作嵐摻料的添加對孔隙結構之效益 27 2.4 混凝土中之氯離子 28 2.4.1 氯離子之來源與存在形式 28 2.4.2 氯離子之傳輸路徑及機制 29 2.4.3 粒料及纖維對於氯離子傳導的影響 31 2.4.4 載重裂縫對氯離子傳輸之影響 33 2.5 混凝土中之氯離子擴散行為 37 2.5.1 擴散方程式與擴散係數 38 2.5.2 水灰比變化與擴散係數之間的關係 40 2.5.3 卜作嵐摻料的添加對於擴散係數變化的影響 41 2.5.4 載重裂縫對擴散係數之影響 43 2.6 鋼筋腐蝕 44 2.6.1 鋼筋之腐蝕機制 44 2.6.2 造成混凝土中鋼筋腐蝕之原因 46 2.6.3 腐蝕鋼筋之力學性質 49 2.6.4 混凝土中鋼筋腐蝕之檢測 50 2.6.5 鋼纖維添加對鋼筋腐蝕檢測之影響 53 2.6.6 載重裂縫對鋼筋腐蝕檢測之影響 56 2.7 鋼纖維鋼筋混凝土梁之力學強度 57 2.7.1 設計基本方法 57 2.7.2 鋼纖維鋼筋混凝土梁之撓曲強度 58 2.7.3 鋼纖維鋼筋混凝土梁之剪力強度 60 2.8 具裂縫之腐蝕鋼筋混凝土梁殘餘強度試驗 62 2.8.1 預裂方法 62 2.8.2 加速腐蝕試驗 67 第三章、貯鹽及鹽霧加速劣化實驗統整 74 3.1 鋼纖維混凝土之貯鹽試驗 74 3.1.1 實驗內容 74 3.1.2 試驗材料 75 3.1.3 配比設計 83 3.1.4 試體製作 83 3.1.5 試驗儀器設備 88 3.1.6 試驗項目 92 3.2 鹽霧室加速劣化試驗 99 3.2.1 實驗內容 99 3.2.2 試驗材料 99 3.2.3 配比設計 100 3.2.4 試體設計 100 3.2.5 試體製作 103 3.2.6 試驗儀器設備 106 3.2.7 量測系統 111 3.2.8 試驗項目 113 第四章、實驗計畫 117 4.1 鋼纖維混凝土之貯鹽試驗 117 4.1.1 實驗內容 117 4.1.2 試驗儀器設備 117 4.1.3 試驗項目 118 4.2 鹽霧室加速劣化試驗 121 4.2.1 實驗內容 121 4.2.2 試驗儀器設備 121 4.2.3 試驗項目 121 第五章、實驗結果 124 5.1 鋼纖維混凝土之貯鹽試驗 124 5.1.1 鋼筋腐蝕電流密度隨齡期之變化 124 5.1.2 混凝土比色法 128 5.1.3 鋼纖維氯離子分佈 130 5.2 鹽霧室加速劣化試驗 133 5.2.1 抗壓試驗 133 5.2.2 鋼筋腐蝕電流密度 136 5.2.3 鋼纖維鋼筋混凝土梁抗彎試驗 140 5.2.4 梁抗彎試驗評估指標 171 第六章、結果分析與討論 180 6.1 鋼纖維混凝土之貯鹽試驗 180 6.1.1 混凝土氯離子分佈及擴散係數 180 6.1.2 鋼纖維混凝土氯離子分佈及擴散係數 192 6.1.3 氯離子分佈及擴散係數隨齡期之變化 198 6.2 鹽霧室加速劣化試驗 200 6.2.1 鋼筋腐蝕量 200 6.2.2 腐蝕後鋼筋殘餘力學預測模型之適用性 205 6.2.3 腐蝕後鋼纖維對於裂縫控制的影響 208 第七章、結論與建議 210 7.1 結論 210 7.2 建議 211 參考文獻 214 附錄 A 普通強度混凝土梁試體設計圖 229 附錄 B 高強度混凝土梁試體設計圖 230 附錄 C 混凝土梁試體拉力主筋初始重量 231 | - |
dc.language.iso | zh_TW | - |
dc.title | 鋼纖維混凝土加速腐蝕試驗分析及長期循環鹽霧劣化後之力學行為研究 | zh_TW |
dc.title | Analysis of Accelerated Corrosion Test and Study on Mechanical Behavior of Long-term Cyclic Salt Spray Deterioration of SFRC | en |
dc.type | Thesis | - |
dc.date.schoolyear | 111-2 | - |
dc.description.degree | 碩士 | - |
dc.contributor.oralexamcommittee | 詹穎雯;楊仲家 | zh_TW |
dc.contributor.oralexamcommittee | Yin-Wen Chan;Chung-Chia Yang | en |
dc.subject.keyword | 鋼纖維混凝土,鹽霧加速劣化試驗,貯鹽試驗,氯離子,耐久性,殘餘力學行為, | zh_TW |
dc.subject.keyword | Steel-fiber concrete,Salt spray accelerated deterioration test,Ponding test,Chloride ions,Durability,Residual strength, | en |
dc.relation.page | 231 | - |
dc.identifier.doi | 10.6342/NTU202302461 | - |
dc.rights.note | 同意授權(限校園內公開) | - |
dc.date.accepted | 2023-08-08 | - |
dc.contributor.author-college | 工學院 | - |
dc.contributor.author-dept | 土木工程學系 | - |
顯示於系所單位: | 土木工程學系 |
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