臺灣四面環海且屬亞熱帶國家，四季常處於高溫且高濕環境當中。鋼筋混凝土構件容易因二氧化碳及氯離子等外在環境因素逐步侵蝕外層混凝土，日積月累下進而造成內部鋼筋構件劣化腐蝕，使得整體結構有安全上的疑慮。
目前臺灣雖盛行結構修復及補強，但尚缺乏相關試驗佐證構件經特定修復補強工法後的性能回復數據。因此，本研究針對嚴重腐蝕之鋼筋混凝土梁構件，使用目前市面上兩種較常見之修復材料(水泥砂漿及環氧樹脂砂漿)，搭配兩種臺灣常見之補強工法(鋼筋搭接補強及碳纖維貼布補強)以及日本近年來常見的碳纖維板補強工法進行鋼筋混凝土梁構件之修復補強，並透過四點抗彎試驗進行結構實際性能回復及裂縫發展之分析，最後針對有效之施工方法進行建議。
本試驗分為兩個部分，第一部分為檢測修復材料基本物性及耐久性試驗，從試驗結果可以發現，低水膠比(W/B=0.45及0.55)且不含飛灰之水泥砂漿及環氧樹脂砂漿等材料之基本力學性能及耐久性能都符合基準值，適合作為修復材料；第二階段為使用不同的修復材料搭配數種補強材料，參考國內外文獻中之施工步驟進行足尺寸腐蝕梁修復補強，並在養護後進行四點抗彎試驗。可以看到彎鉤鋼筋補強試體整體強度及變形能力皆提升最多，但施工過程較繁瑣，且修復寬度需搭配鋼筋伸展長度大幅提升；碳纖維貼布補強試體強度整體強度提升高，但變形能力卻相對較低；碳纖維板補強試體強度提升相對較低，試體變形能力提升則為次高。碳纖維補強材料施工過程只需在試體外進行，施工程序較傳統鋼筋置換便利。水泥砂漿修復之試體在試驗加載中可以看到裂縫數量較多且每條裂縫寬度較小，較可以分散拉力鋼筋內力；而環氧樹脂修復之試體裂縫少，裂縫集中發展於拉力鋼筋之特定位置，受力較集中之狀況下，導致使用相同補強材料時，環氧樹脂砂漿相較於水泥砂漿修復之試體變形能力較差。

Taiwan is a tropical island surrounded by oceans, which has high humidity and temperature. The reinforced concrete structure, which is the most common structure type in Taiwan, has been corrode easily due to the environmental factors, such as chloride ion or carbon dioxide. Those factors can make concrete degraded by chemical mechanism. Once the cover protecting reinforcement failed, the rebar start corroding, which could become the potential safety concern of building.
Therefore, structure repairment and retrofitting become the popular issue in Taiwan. Since most repairment or retrofitting procedures are lacking in provident of experimental data in Taiwan, the main idea of this research is suggesting of repairment and retrofitting SOP in positive moment region which could apply to seriously corrosion beam structure. This research would use the most common repair material such as cement mortar and epoxy mortar, applying with the retrofit material, like rebar, carbon fiber laminate and carbon fiber slab, to repair and retrofit the beam members which is highly corrosion in the middle of longitudinal tension rebar. We would test the performance of beam members through determination of flexural strength by four-point method once they’ve been recovery.
There are two parts in this research. First, we would test the mechanical mechanism and durability of the repair material. The result shows that the most proportions in cement mortar(W/B=0.45, 0.55 without fly ash) and Epoxy mortar in this research, are suitable to be the repair material based on the material performance requirement chart. Second, we recover the corroding beam member by using two qualified repair materials and three retrofit material based on reference domestic and abroad. After curing of members, we test the recovery efficiency by means of four-point bending method. As a result, members retrofitted by rebar have the highest strength recovery and the best deformation; Members retrofitted by CFRP laminate have the higher strength than CFRP slab, but show the poorest deformation; Members retrofitted by CFRP slab have the lowest strength enhancement, but show the better deformation than CFRP laminate. Also, members repaired by epoxy mortar have the bigger but lower quantity cracks than cement mortar. We conclude the force would be supposed to be more concentrated in members repaired by epoxy mortar than cement mortar.

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