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本文提出了一种快速、无损、准确检测钢筋/混凝土(砂浆)体系中钢筋腐蚀速率的TR法。该法用本文设计的计算机数据采集系统,采集钢筋对阶跃电位的暂态响应,根据高斯——牛顿法编制的计算机拟合程序,拟合钢筋对阶跃电位△E=10mV的暂态响应,求得极化电阻R_p;拟合弱极化数据,求得塔费尔常数B。在加速腐蚀实验条件下,测定体系中钢筋的腐蚀量。结果表明,用TR法测得的腐蚀失重量与实际失重量较为一致。在此基础上,提出了符合体系中钢筋腐蚀的等效电路模型。通过测定砂浆中钢筋处于不同腐蚀状态时的B值发现,在整个腐蚀进程中,B值逐渐变小,并趋于一定值。
This paper presents a rapid, non-destructive, and accurate TR method for the detection of corrosion rates in rebar/concrete (mortar) systems. The method uses the computer data acquisition system designed in this paper to collect the transient response of the steel bars to the step potential. According to the computer fitting program compiled by the Gauss-Newton method, the transient response of the steel bars to the step potential ΔE=10mV is fitted. Obtain the polarization resistance R_p; fit the weakly polarized data and obtain the Tafel constant B. Under the accelerated corrosion test conditions, the amount of corrosion of the steel bars in the system was determined. The results show that the corrosion weight loss measured by the TR method is consistent with the actual weight loss. Based on this, an equivalent circuit model for corrosion of rebar in the system is proposed. By measuring the B value of the steel bar in different corrosion states in the mortar, it is found that in the entire corrosion process, the B value gradually becomes smaller and tends to a certain value.