台灣濱海鋼筋混凝土結構物腐蝕調查研究

Corrosion Investigation Study Of Nearshore Reinforced Concrete Structures In Taiwan

台灣濱海之錒筋混凝土（RC）結構物之腐蝕現況已進行十年以上之調查。調查工作包括混凝土保護層厚度和混凝土鑽心取樣等工作。而在實驗室工作係根據鑽心取樣所取回之試樣進行化學分析及氯離子擴散速率等解析。試驗結果顯示現有海洋RC結構物之氯離子（含量相當高，鋼筋腐蝕之主因為Cl-之侵入；結構物離海岸愈近者，Cl-侵入擴散分佈曲線愈準確，對使用年限為50年之RC結構物混凝土保護層厚度至少需保護層厚度11.4公分及使用具有良好品質控制之措施。

The nearshore reinforced concrete (RC) structures in Taiwan have been investigated for over ten years. The field survey included concrete cover layer and core samples drilled. The tests included the chemical analysis, microstructure analysis, and chloride diffusion rate etc. The test data show that the content of CIE in the existing marine RC structures is very high. The main factor that controls the corrosion of steel in the RC structures is the penetration of Cl- The test data show that the more nearshore the structures are, the more accurate distribution of chloride penetration in the concrete will be. For 50 years service life of steel in RC structures, a minimum depth of 11.4 cm concrete cover layer with better quality control of concrete is required in Taiwan.