水泥砂漿常用於修補建築物和結構中的裂縫、損壞或破損。它可以填補空隙，修復結構的完整性，並提供額外的支撐。然而其成分多元，不僅有卜特蘭水泥亦含各類摻料及藥劑，如何影響鋼筋腐蝕行為值得探討。JC/T 986-2018為水泥基灌漿材料的試驗規範，其中所列的鋼筋腐蝕快速試驗法為評估其對鋼筋腐蝕的影響。然而，規範中使用低碳鋼棒作為電極而非竹節鋼筋，在實務上是否造成鋼筋腐蝕尚待釐清。本研究參照該規範中鋼筋腐蝕快速試驗法量測砂漿內鋼棒的電位變化，再使用開路電位、直流極化、交流阻抗和脈衝電流法量測計算實際砂漿內竹節鋼筋的腐蝕量，以驗證鋼筋腐蝕快速試驗法的適用性。
根據試驗結果，鋼筋腐蝕快速試驗法對於砂漿中氯離子含量較為敏感，當新拌砂漿中氯離子含量超過0.15 kg/m3時，陽極極化電位值皆會明顯下降，代表鈍化膜受到破壞。比較腐蝕量時，氯離子含量低於0.15 kg/m3之砂漿試體鋼筋的腐蝕量較為接近(相差約1-5%)，並隨著氯離子含量的提升，腐蝕量大為增加(增加約25%)。另外，水灰比從0.6降至0.4或細粒料比1：3降至1：2及以卜作嵐摻料取代部分水泥時，陽極極化電位值多數皆未明顯下降，均在600-800 mV之間，而腐蝕量也皆低於氯離子含量超過0.15 kg/m3砂漿。此外，快速試驗法相較於開路電位法精準，如水灰比從0.6降至0.4，養護齡期7天試體之開路電位法會從-117.161 mV降至-154.273 mV，代表容易腐蝕，不符合實際腐蝕情況；鋼筋腐蝕快速試驗法則從812.158 mV升至847.736 mV，代表不容易腐蝕，較符合實際腐蝕情況。
快速試驗法的極化電位值高低，可簡要判斷水泥基灌漿材料對於鋼筋腐蝕的影響，如極化電位值越高，鈍化膜越穩定，相應腐蝕機率則越低；而極化電位值越低，鈍化膜越不穩定，相應腐蝕機率則越高。另外，若極化電位值轉為負值，代表材料中含有害因子(如氯離子)，鈍化膜已被破壞，並造成鋼筋腐蝕。

Cement mortar is commonly used to repair cracks, damages, or deteriorations in buildings and structures. It can fill voids, restore structural integrity, and provide additional support. However, its compositions are diverse, including not only the Portland cement but also various kinds of admixtures. Its impact on the steel reinforcement corrosion is worthy of investigation. JC/T 986-2018 is the testing specification for the cement-based grouting materials, and it includes a rapid corrosion test for the steel reinforcement to assess the effect of the cement-based grouting materials on the steel corrosion. However, the use of low-carbon steel round bars as electrodes rather than the deformed steel reinforcement, as specified, raises questions about actual impact of the cement-based grouting materials on the steel corrosion. This study follows the specified rapid corrosion test for the steel reinforcement in JC/T 986-2018 to measure the potential changes of steel reinforcements in mortar, then employs open circuit potential, direct current polarization, alternating current impedance, and impulse currents to measure and calculate the corrosion of the deformed steel reinforcement in mortar. This study aims to verify the applicability of the rapid corrosion test for steel reinforcement.
According to the test results, the rapid corrosion test for the steel reinforcement was sensitive to the chloride ion content in mortar. When the chloride ion content in a freshly mixed mortar exceeded 0.15 kg/m³, the anodic polarization potential values all significantly decreased, indicating the breakdown of the passivation film. When comparing amounts of the corrosion, mortar specimens with chloride ion content below 0.15 kg/m³ exhibited steel reinforcement corrosion amounts that were relatively close (with a difference of about 1-5%), and as chloride ion content increased, the amount of corrosion increased significantly (by about 25%). Additionally, as the water-to-cement ratio was reduced from 0.6 to 0.4 or the fine aggregate ratio was decreased from 1:3 to 1:2, or when pozzolanic materials were used to replace some of the cement, most of the anodic polarization potential values did not show significant decreases and remained between 600-800 mV. The amount of corrosion were also below those seen in mortars with chloride ion content exceeding 0.15 kg/m³. Furthermore, compared to the open circuit potential measurement, the rapid corrosion test method was more accurate. For instance, when the water-to-cement ratio was reduced from 0.6 to 0.4, the open circuit potential for specimens with a curing age of 7 days shifted from -117.161 mV to -154.273 mV, indicating susceptibility to the corrosion and not matching actual corrosion conditions. Conversely, the rapid corrosion test method shifted from 812.158 mV to 847.736 mV, indicating less susceptibility to corrosion and aligning better with actual corrosion conditions.
The polarization potential values obtained from the rapid corrosion test can be used to briefly judge the impact of the cement-based grouting materials on the steel reinforcement corrosion. Higher polarization potential values correspond to more stable passivation films, and consequently, a lower probability of corrosion. Conversely, lower polarization potential values correspond to less stable passivation films and a higher probability of corrosion. Additionally, if the polarization potential values shift to negative values, it signifies the presence of harmful factors (such as chloride ions), indicating the breakdown of the passivation film and resulting in steel reinforcement corrosion.

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