台灣沿海環境橋樑腐蝕現況調查及耐久性基因探討

Durability Study of Reinforced Concrete Bridges Based on Investigation of Corrosion Conditions of Bridges Located at Seacoast in Taiwan

針對台灣既有鋼筋混凝土橋樑進行結構物腐蝕現況檢測分析、腐蝕氣象因子調查分析，找出環境因子、材料性質與橋樑結構物腐蝕之間的關連性，並針對國內橋樑結構物的腐蝕因素與模式，探討耐久性防蝕對策，提供材料選用、設計、防蝕之相關考量資訊為主要目的。研究結果顯示，台灣地區的腐蝕形態，深受海洋環境及溫、濕度的影響。現地鋼筋混凝土橋樑檢測，藉由非破壞性電化學試驗儀器偵測出濱海橋樑有嚴重之腐蝕問題，再經由破壞性試驗鑽心取出混凝土試體，測試抗壓強度及氯離子分布狀態與擴散速率分析，發現氯離子在混凝土內有擴散現象，其擴散速率與環境因素、材料與施工品質有密切關係。

Aimed for already has a reinforced concrete bridges to proceed the examination analysis to the corrosion structure, diagnosis the corrosion meteorological factor, discover the environment factor, correlation between the Nature of Material & Bridges Structure Corrosion, then aiming at the domestic bridge structure corrosion Factor & Pattern, to discuss the durability of prevention corrosion countermeasure, provides the selection materials, designing, prevention corrosion related consideration information as primary goal. Corrosion conditions in Taiwan are deeply influenced by marine environment, temperature, and humidity. Reinforced concrete bridges were investigated by means of non-destructive electrochemistry testing instrument to detect corrosion of the bridges, and then using destructive testing methods, i.e. taking concrete cores, to perform compressive resistance, chlorine distribution conditions, and diffusion rate analysis. It is concluded that chlorine can propagate in concrete matrix; and the diffusion rate, environment elements, materials, and construction quality will be factors to affect corrosion of reinforced steel.