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为了探究利用外加电源方式对钢筋混凝土进行再碱化处理的耐久性效果,人工碳化钢混板经过8.5 d的再碱化处理后,在恒温恒湿实验室里存放540 d,然后在室外自然老化360 d.期间,采用多种分析化学方法(酚酞指示剂法;混凝土粉样测试法;原子吸收光谱法)对混凝土的再碱化程度进行量化分析,同时应用多种电化学技术(自由电势、线性极化电阻技术、电化学阻抗技术)对钢筋腐蚀的活性变化进行评估.实验结果表明:采用外加电源方式对碳化钢筋混凝土进行再碱化处理后,混凝土保护层可在一定程度上被有效的再碱化,且具有很好的耐久性,但钢筋腐蚀的活性只在短期内(360 d左右)有效下降,900 d后,其活性又恢复到处理前的水平.
In order to explore the durable effect of re-alkalization of reinforced concrete by means of external power supply, artificial carbonized steel mixed board was re-alkalized after 8.5 days, stored in a constant temperature and humidity laboratory for 540 days and then naturally aged outdoors During 360 days, the degree of re-alkalization of concrete was quantitatively analyzed by a variety of analytical chemistry methods (phenolphthalein indicator method; concrete powder test method; atomic absorption spectroscopy), and simultaneous application of various electrochemical techniques (free potential, Linear polarization resistance technique and electrochemical impedance technique) were used to evaluate the corrosion activity of steel bar.The experimental results show that after re-alkalization of carbonized reinforced concrete by external power supply, the concrete protective layer can be effectively Re-alkalized, and had good durability. However, the corrosion activity of steel reinforcement decreased only effectively in the short term (about 360 days), and returned to its pre-treatment level after 900 days.