台灣氣候潮溼，習慣上許多房屋於外牆貼附不同形式之磁磚，因此在現地評估鋼筋腐蝕時，相當地影響腐蝕量測，刨除披覆為事先必要作業，耗費人力與物力。為了減少對結構物的損傷與工程花費，本研究探討水泥砂漿上的披覆間距與披覆性質對鋼筋腐蝕量測之影響，期能在不需要刨除披覆的情況下，完成腐蝕量測。試驗過程中，首先製作不同披覆配置之水灰比0.6砂漿試體，於水中養護28天後，將試體於3.5%之鹽水中進行加速通電，再逐日使用脈衝電流法、直流極化法、交流阻抗法量測鋼筋之腐蝕電流密度，進而計算鋼筋腐蝕速率與腐蝕量，最後再與鋼筋實際重量損失進行比較。研究結果顯示，三者量測法所得之計算腐蝕量皆低於實際腐蝕量，當披覆間距越小與披覆透水率越低時，所量測之腐蝕量越小，故越不準確。

In Taiwan, many buildings generally have tiles on top of the exterior walls due to the humid weather. The cover materials on the wall thus induce the difficulties in the onsite corrosion measurement, and the removal of the cover must be conducted prior to the measurement, which requires large efforts and expenses. In order to reduce such expenses and the damages to the buildings, this study explores the influences of the cover spacing and the cover properties on the reinforcement corrosion measurements. It is hoped that the measurements can be conducted without the cover removal in advance. During the study, the mortar specimens embedded with a steel reinforcement were prepared at w/c of 0.6, cured in water for 28 days, accelerated charged in 3.5% salt solution, and measured daily by galvanotstatic technique, linear polarization, and AC impedance. The corrosion current density was measured, and the corrosion rate and amount of corrosion was then calculated and compared with the actual weight loss. Results showed that the calculated weight loss by each method was less than the actual weight loss. As the spacing and the water permeability of the cover was reduced, the measured weight loss was reduced, suggesting less accuracies.

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