Characterizations of RC Beams Intervened by ICCP-SS System with Externally Bonded Carbon-FRCM Composites

• Material Type: 博士論文
• Title: Characterizations of RC Beams Intervened by ICCP-SS System with Externally Bonded Carbon-FRCM Composites
• Author/Editor: 魏, 亮亮
• Author Heading: 魏, 亮亮
• Publication, Distribution, etc.: Hokkaido University
• Publication Date: 2020-06-30
• Publication Date (W3CDTF): 2020-06-30
• Alternative Title: 炭素 FRCM 複合材の外部接着により ICCP-SS 工法を施した RC はりの特性評価
• Contributor: 松本, 浩嗣; 松本, 高志; 横田, 弘; 杉山, 隆文; 上田, 多門; Zhu, Ji-Hua
• Degree grantor/type: 北海道大学
• Date Granted: 2020-06-30
• Date Granted (W3CDTF): 2020-06-30
• Dissertation Number: 甲第14163号
• Degree Type: 博士(工学)
• Conferring No. (Dissertation): 甲第14163号
• Text Language Code: eng
• Subject Heading: FRCM; ICCP; beam; static; fatigue; anodic polarization; S-N
• NDC: 500
• Target Audience: 一般
• Note (General): The development of alternative techniques for structural rehabilitation is of critical importanceto the safety and sustainability of concrete structures suffered from corrosion of steel. The structuralstrengthening (SS) and impressed current cathodic protection (ICCP) are conventional methods toimprove the safety and sustainability of corroded concrete structures at different perspectives. TheSS can recover the load-carrying capacity of deteriorated concrete structures, while the ICCP canretard the corrosion of steel in concrete. Currently, a new strategy to integrate ICCP with SS hasbeen proposed that is termed as ICCP-SS intervention system. Fabric reinforced cementitious matrix(FRCM) composites have emerged as an alternative reinforcement material to fiber reinforcedpolymer (FRP) composites for structural strengthening and rehabilitation. The carbon-FRCMcomposite can be adopted as the dual-functional material in the ICCP-SS system in which carbon-FRCM plays the role of reinforcement material in the SS system and of anode material in the ICCPsystem. To this end, an experimental program was undertaken to propel the application andoptimization of the ICCP-SS intervention system.This study aims to clarify the characterization of RC beams with externally bonded carbon-FRCM under static and cyclic loading. Two carbon-FRCM composites were considered for thisresearch, one with multilayer carbon-FRCM (M/C-FRCM) intended for understanding theeffectiveness of carbon-FRCM in strengthening beams and one with anodically polarized carbon-FRCM (AP/C-FRCM) for evaluating the mechanical degradation caused by anodic polarization inthe ICCP on the strengthening characterization of RC beams. From the material perspective, themechanical properties of both M/C-FRCM and AP/C-FRCM composites were also studied.The first study investigates the static performance of RC beams with externally bonded M/CFRCM.The static tensile tests of M/C-FRCM were conducted, followed by the four-point bendingtests of beams with externally bonded M/C-FRCM under static loading. Nine M/C-FRCMspecimens were prepared for tensile tests, and four beams were prepared for bending tests. Theprediction model of apparent strain of carbon fabric (CF) mesh in the M/C-FRCM was proposedbased on the global strain of carbon-FRCM in tension. The load-carrying capacity of beams withexternally bonded M/C-FRCM improved that was largely dependent on the amount of CF mesh. Ananalytical study on the prediction formulas in flexure for RC beams with externally bonded carbon-FRCM was performed by using the model of apparent strain of CF mesh. Prediction results agreedwell with the experimental results.The second study explores the fatigue performance of RC beams with externally bonded M/CFRCM.The cyclic tensile tests of M/C-FRCM were performed and followed by the four-pointbending tests of beams with externally bonded M/C-FRCM under cyclic loading. Nine M/C-FRCMspecimens were prepared for cyclic tensile tests, and twelve beams were prepared for cyclic bendingtests. The fatigue life model and the fatigue strength model of M/C-FRCM composites wereproposed. The fatigue life performance of carbon-FRCM was compared with steels and CFRPcomposite materials. Besides, the fatigue stress limit of M/C-FRCM was recommended to be 35%of the ultimate tensile strength. Carbon-FRCM composites significantly improved the fatigueperformance of RC beams comparing with un-strengthened beams. The S-N curve for beams withexternally bonded M/C-FRCM was proposed.The third study examines the influence of anodic polarization on the static performance of RC beams with externally bonded AP/C-FRCM. An accelerated electrochemical (AC-EC) test wasperformed to introduce the anodic polarization to the carbon-FRCM making the AP/C-FRCM. Then,the static tensile tests of AP/C-FRCM were conducted and followed by the four-point bending testsof beams with externally bonded AP/C-FRCM under static loading. The tensile strength of carbon-FRCM reduced after suffering from anodic polarization. Effectiveness of carbon-FRCM sufferingfrom anodic polarization in strengthening did not change before the yielding of steel and weakenslightly as increasing the intensity of anodic polarization.The last study detects the influence of anodic polarization on the fatigue performance of RCbeams with externally bonded AP/C-FRCM. The identical AP/C-FRCM composites were adoptedin this study. The cyclic tensile tests of AP/C-FRCM were performed and followed by the four-pointbending tests of beams with externally bonded AP/C-FRCM under cyclic loading. The combineddamage effect of the anodic polarization and cyclic loading caused an acceleration of reduction ofstiffness and decrease of fatigue life of carbon-FRCM. Based on the total experimental data, the SNcurve for beams with externally bonded fabric reinforcement by inorganic matrix was proposed.Overall, the constitutive behavior of both M/C-FRCM and AP/C-FRCM were assessed bystatic tensile tests, and the fatigue degradation characterizations of both carbon-FRCM wereevaluated through cyclic tensile tests. The fatigue life prediction models of M/C-FRCM and AP/CFRCMwere proposed based on the experimental data. The strengthening behaviors of RC beamswith externally bonded M/C-FRCM and AP/C-FRCM were investigated under static and cyclicloading. The prediction formulas in flexure for RC beams with externally bonded carbon-FRCMwas proposed. Besides, the fatigue life of strengthened beams was predicted well based on theproposed S-N curve. However, in future studies, the further optimization design of carbon-FRCMis necessary to improve the mechanical behavior of itself and bond behavior with concrete substrate.Moreover, the fatigue performance of the bond between carbon-FRCM and concrete needs to beinvestigated to improve the fatigue life prediction of RC beams with externally bonded carbon-FRCM composites.; (主査) 准教授 松本 浩嗣, 教授 松本 高志, 教授 横田 弘, 教授 杉山 隆文, 教授 上田 多門 (深圳大学), 教授 Zhu Ji-Hua (深圳大学); 工学院（北方圏環境政策工学専攻）
• DOI: 10.14943/doctoral.k14163; https://doi.org/10.14943/doctoral.k14163
• Persistent ID (NDL): info:ndljp/pid/11526440; https://dl.ndl.go.jp/pid/11526440
• Collection: 障害者向け資料
• Collection (Materials For Handicapped People:1): テキストデータ
• Collection (particular): 国立国会図書館デジタルコレクション > デジタル化資料 > 博士論文; https://dl.ndl.go.jp/collections/A00014
• Acquisition Basis: 博士論文（自動収集）
• Date Accepted (W3CDTF): 2020-08-11T22:41:34+09:00
• Date Created (W3CDTF): 2020-06
• Format (IMT): PDF
• Access Restrictions: 国立国会図書館内限定公開
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• Periodical Title (URI): http://dx.doi.org/10.14943/doctoral.k14163; http://hdl.handle.net/2115/78928
• Is Referenced By (URI): http://hdl.handle.net/2115/78927
• Data Provider (Database): 国立国会図書館 : 国立国会図書館デジタルコレクション; https://dl.ndl.go.jp