The increase in the corrosion rate around a repair area caused by the formation of a galvanic cell between the substrate concrete and the repair mortar is known as the incipient anode. The current study is aimed at investigating the effects of repair dimensions on the corrosion rate of the macrocell created by the patch repair. To do so, repair slabs were manufactured with different repair dimensions and repair mortars containing ordinary Portland cement (OPC), 5% microsilica, and 9% microsilica. The half-cell potential and macrocell current of the experimental specimens were measured, and the electrochemical parameters (i.e., Tafel slope and macrocell corrosion rate) of the repair mortar and the substrate concrete were determined. The effects of repair dimensions and the driving force were evaluated in a wider range using a numerical model. The results showed that compared to OPC, the repair mortar containing 9% microsilica significantly reduced the maximum macrocell corrosion (MMC) and the average macrocell corrosion (AMC) rates. The effects of the repair dimensions are not significant and there is only a slight increase of 30% in the MMC rate when the repair dimension is less than 30 cm, while this rate remains constant in repair dimensions higher than 30 cm. The effect of the repair dimension on the AMC is more significant than its effect on the MMC, i.e., as the repair dimension increases to 100 cm, the AMC increases by at least 130%, and then, it remains constant. Moreover, the reduction in the driving force considerably decreased the MMC and AMC rates.

由在基底混凝土和修补砂浆之间形成原电池引起的修补区域周围腐蚀速率的增加被称为初始阳极。当前的研究旨在研究修补尺寸对补丁修补产生的宏单元腐蚀速率的影响。为此，要制造具有不同维修尺寸的维修板，并使用含普通波特兰水泥（OPC），5％的微硅粉和9％的微硅粉的修补砂浆。测量了实验样品的半电池电位和大电池电流，并确定了修补砂浆和基层混凝土的电化学参数（即塔菲尔斜率和大电池腐蚀速率）。使用数值模型在更大范围内评估了维修尺寸和驱动力的影响。结果表明，与OPC相比，含9％硅微粉的修补砂浆显着降低了最大大孔腐蚀（MMC）和平均大孔腐蚀（AMC）速率。修复尺寸的影响并不显着，并且当修复尺寸小于30 cm时，MMC速率仅略微增加30％，而在大于30 cm的修复尺寸中，该速率保持恒定。修复尺寸对AMC的影响比其对MMC的影响更为显着，即，当修复尺寸增加到100 cm时，AMC至少增加130％，然后保持恒定。此外，驱动力的降低大大降低了MMC和AMC比率。含9％硅微粉的修补砂浆显着降低了最大宏电池腐蚀（MMC）和平均宏电池腐蚀（AMC）速率。修复尺寸的影响并不显着，并且当修复尺寸小于30 cm时，MMC速率仅略微增加30％，而在大于30 cm的修复尺寸中，该速率保持恒定。修复尺寸对AMC的影响比其对MMC的影响更为显着，即，当修复尺寸增加到100 cm时，AMC至少增加130％，然后保持恒定。此外，驱动力的降低大大降低了MMC和AMC比率。含9％硅微粉的修补砂浆显着降低了最大宏电池腐蚀（MMC）和平均宏电池腐蚀（AMC）速率。修复尺寸的影响并不显着，并且当修复尺寸小于30 cm时，MMC速率仅略微增加30％，而在大于30 cm的修复尺寸中，该速率保持恒定。修复尺寸对AMC的影响比其对MMC的影响更为显着，即，当修复尺寸增加到100 cm时，AMC至少增加130％，然后保持恒定。此外，驱动力的降低大大降低了MMC和AMC比率。修复尺寸的影响并不显着，并且当修复尺寸小于30 cm时，MMC速率仅略微增加30％，而在大于30 cm的修复尺寸中，该速率保持恒定。修复尺寸对AMC的影响比其对MMC的影响更为显着，即，当修复尺寸增加到100 cm时，AMC至少增加130％，然后保持恒定。此外，驱动力的降低大大降低了MMC和AMC比率。修复尺寸的影响并不显着，并且当修复尺寸小于30 cm时，MMC速率仅略微增加30％，而在大于30 cm的修复尺寸中，该速率保持恒定。修复尺寸对AMC的影响比其对MMC的影响更为显着，即，当修复尺寸增加到100 cm时，AMC至少增加130％，然后保持恒定。此外，驱动力的降低大大降低了MMC和AMC比率。它保持不变。此外，驱动力的降低大大降低了MMC和AMC比率。它保持不变。此外，驱动力的降低大大降低了MMC和AMC比率。