The electrochemical tests commonly used for evaluating reinforcement corrosion in Portland cement-based concrete may not be appropriate for testing alkali-activated slag (AAS) concrete due to its different pore structure and pore solution composition. In this article, corrosion behaviour of the steel bars in 12 AAS concrete mixes with different alkali concentration and modulus of sodium silicate solution was monitored by using gravimetric mass loss measurement. The results obtained from other electrochemical tests were compared to the gravimetric mass loss to determine their suitability for assessing the corrosion of steel in AAS concrete. It was found that only 7.8–28% of the mass loss was accounted for by the macrocell current for AAS concretes, indicating that this type of test underestimates the corrosion of the steel in AAS concrete. The steel bars in the AAS concretes gave a much higher negative half-cell potential value, presumably due to the influence of sulfides. In summary, it has been established that the criteria for assessing the onset and progress of corrosion of steel in Portland cement concrete are not suitable for the same purpose in the range of AAS concretes studied.

中文翻译：

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电化学测试方法在碱活化矿渣混凝土中评价钢腐蚀的适用性

由于其不同的孔隙结构和孔隙溶液组成，通常用于评估波特兰水泥基混凝土中钢筋腐蚀的电化学测试可能不适用于测试碱活化矿渣 (AAS) 混凝土。在本文中，采用重量失重测量法监测了 12 种 AAS 混凝土混合料在不同碱浓度和硅酸钠溶液模量下的钢筋腐蚀行为。将其他电化学测试获得的结果与重量质量损失进行比较，以确定它们对评估 AAS 混凝土中钢腐蚀的适用性。发现只有 7.8-28% 的质量损失是由 AAS 混凝土的宏电池电流引起的，这表明这种类型的测试低估了 AAS 混凝土中钢的腐蚀。AAS 混凝土中的钢筋给出了更高的负半电池电位值，这可能是由于硫化物的影响。总之，已经确定，在所研究的 AAS 混凝土范围内，用于评估硅酸盐水泥混凝土中钢材腐蚀发生和进展的标准不适用于相同目的。