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通过大量的构件破型观测了混凝土中钢筋的表观锈蚀形态,基于电化学基本原理,对混凝土中钢筋的腐蚀电流分布进行了机理分析和试验验证.结果表明,混凝土内钢筋的锈蚀特征取决于钢筋内外表面的钝活化状态和他们之间形成的宏观腐蚀电流Ig.Ig的存在不仅加速了钢筋外表面的锈蚀,而且对钢筋内表面形成了阴极保护,从而使钢筋锈蚀呈现出靠近混凝土保护层的一侧锈蚀比较严重,而背向保护层的一侧则几乎没有发生锈蚀的特征.钢筋的腐蚀为微电池腐蚀和宏电池腐蚀并存,忽略其中任何一个都将使计算的腐蚀电流偏低.钢筋的总腐蚀电流等于活化区钢筋的微电池腐蚀电流Icorr2和Ig在活化区引起的阳极溶解电流的增大值(ΔIcorrA)之和.
Based on the basic principle of electrochemistry, the corrosion current distribution in reinforced concrete was analyzed by mechanics and verified by a large number of component breaking tests.The results show that the corrosion characteristics of reinforcing steel in concrete depend on The blunted state of the inner and outer surfaces of the bar and the macroscopic corrosion current Ig.Ig formed between them not only accelerate the corrosion of the outer surface of the bar but also form the cathodic protection on the inner surface of the bar so that the bar rust appears to be close to the concrete cover Of the side of the corrosion is more serious, while the side facing away from the protective layer is almost no corrosion characteristics of the corrosion of the micro-cell corrosion and macro-cell corrosion coexist, ignoring either one will make the calculated corrosion current is low. The total corrosion current is equal to the sum of the increase of the anodic dissolution current (ΔIcorrA) caused by the IgM corrosion current Icorr2 and Ig in the activation zone.