本文旨在探討具有裂縫的混凝土受氯離子侵蝕環境之複合劣化。本研究共規劃五種不同裂縫型式之鋼筋混凝土試體，其裂縫型式分別為無裂縫、乾縮裂縫、拉力區內部產生微裂縫、0.1㎜及0.4㎜之人工裂縫。本研究利用JCI硬固混凝土氯離子含量試驗法及DC直流線性極化試驗法，分別探討氯離子於不同裂縫型式下之擴散傳輸路徑及對鋼筋之腐蝕電流密度。
研究結果顯示：（1）在相同情況下，Microcell電流密度遠大於Macrocell電流密度，所以鋼筋的腐蝕程度以Microcell電流密度來主控。在氯離子環境中，一旦混凝土產生肉眼可見裂縫時，則混凝土內部之鋼筋將會受到嚴重的腐蝕；若混凝土內部產生微裂縫時，則鋼筋亦會有一定程度之腐蝕。（2）除了具有乾縮裂縫之試體外，其餘裂縫型式之試體氯離子含量分佈皆為表層含量最高，各取樣點的自由氯離子含量大約為總氯離子含量的75%；具有乾縮裂縫試體的氯離子含量分佈情況則與其產生之乾縮裂縫位置有關。（3）自由氯離子含量較高者所對應的總腐蝕電流密度亦呈現較高，但兩者未成一定之比例關係。（4）氯離子於無裂縫情形與拉力區內部產生微裂縫型式之傳輸路徑為均勻分佈；氯離子於乾縮裂縫型式之傳輸路徑為隨著裂縫離散分布；氯離子於0.1㎜與0.4mm人工裂縫型式之傳輸路徑為以裂縫為中心之鐘形分佈，裂縫寬度越大，則鐘形分佈之趨勢愈明顯。

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