作　　者： ; ; ; ;

机构地区： 宁波大学建筑工程与环境学院

出　　处： 《硅酸盐学报》 2010年第4期615-620,共6页

摘　　要： 通过含氯盐与亚硝酸盐钢筋混凝土加速腐蚀试验肉眼观察确定了腐蚀等级,并结合阳极极化、电极电位、腐蚀面积率和质量损失率综合确定抑制钢筋腐蚀所需临界摩尔比n(NO–2)/n(Cl–)。结果表明:混凝土中钢筋腐蚀的评价方法不同,临界n(NO2–)/n(Cl–)有一定的差异,混凝土中钢筋质量损失率与腐蚀面积率之比可以很好地评价钢筋坑蚀程度;随着混凝土中氯离子含量的增加,抑制钢筋腐蚀所需临界n(NO–2)/n(Cl–)提高,在氯离子含量小于4kg/m3范围内,n(NO2–)/n(Cl–)小于0.4时抑制钢筋腐蚀效果不明显,有时加速宏电池腐蚀;当n(NO2–)/n(Cl–)大于1.2时可以完全抑制钢筋腐蚀。同时明确了模拟混凝土孔溶液中临界n(NO2–)/n(Cl–)小于实际混凝土中临界n(NO–2)/n(Cl–)。 In accelerated steel corrosion test of reinforced concrete containing various quantities of calcium chloride and calcium nitrite,the critical mole ratio of n（NO–2）/n（Cl^–） that inhibs reinforcing bars from corrosion was determined by visual observations,anodic polarization,half-cell potentials,mass loss and corroded area.The results indicate that there are significant differences in the critical value of n（NO–2）/n（Cl^–）.When using different corrosion evaluating methods,the ratios of mass loss and corrosion area can be a good assessment of the extent of corrosion of reinforced pit;The inhibiting effect of nitrite from reinforcement corrosion is not obvious and sometimes speed up the macro-cell corrosion when critical value of n（NO2^–）/n（Cl^–） in reinforced concrete is less than 0.4.However the passive state of reinforcements can be adequately preserved in the experimental condition when n（NO–2）/n（Cl^–） is above 1.2.The simultaneous results show that the critical value of n（NO–2）/n（Cl^–） in the synthetic concrete pore solution is less than that in the real concrete.

关 键 词： 钢筋腐蚀 评价方法 宏电池腐蚀 临界摩尔比

领　　域： [化学工程] [化学工程]