University Core Research Center for Disaster-free and Safe Ocean City Construction, Dong-A University, Busan 49315, Korea.
Department of Architectural Engineering, Dong-A University, Busan 49315, Korea.
Sensors (Basel). 2019 Dec 30;20(1):199. doi: 10.3390/s20010199.
The primary objective of the present work is to measure the corrosion rate of reinforcing steel embedded in concrete structures in a simulated marine environment of high chloride concentration. The selection of a single frequency that corresponds to the solution resistance and single frequency that corresponds to the charge transfer resistance were performed and measurements were carried out in a relatively faster time. A total of seven cement mortar specimens were prepared. The effect of varying cover thickness (5-50 mm) and rebar distance (10-80 mm) on the electrical resistance of the concrete and corrosion rate of the steel was examined. To simulate the corrosion of reinforced concrete in a marine environment, cement mortars were exposed to 25 wet-dry cycles that involve an immersion for 8 h in 3 wt.% NaCl solution and drying time of 16 h under room temperature. Alternative current (AC) impedance measurements were carried out within a frequency range from 100 kHz to 1 mHz. Results show that the formation of rust layers on rebars has caused a significant decrease in the maximum phase shift to θ = -30°. An accelerated corrosion rate of the rebars was observed during drying stage.
本工作的主要目的是测量模拟高氯离子浓度海洋环境中混凝土结构中埋置钢筋的腐蚀速率。选择与溶液电阻相对应的单一频率和与电荷转移电阻相对应的单一频率，并在相对较快的时间内进行测量。共制备了七个水泥砂浆试件。研究了不同覆盖厚度（5-50mm）和钢筋间距（10-80mm）对混凝土电阻和钢筋腐蚀速率的影响。为了模拟海洋环境中钢筋混凝土的腐蚀，将水泥砂浆试件暴露于 25 个干湿循环中，其中包括在 3wt.%NaCl 溶液中浸泡 8 小时和在室温下干燥 16 小时。在 100kHz 至 1mHz 的频率范围内进行交流阻抗测量。结果表明，钢筋上锈层的形成导致最大相移到θ=-30°显著减小。在干燥阶段观察到钢筋的腐蚀速率加快。
