拉应力和压应力对砂浆中钢筋腐蚀的影响

发布时间：2018-06-15 21:31

本文选题：混凝土 + 钢筋　；参考：《建筑材料学报》2015年04期

【摘要】：对埋置钢筋的砂浆试样施加不同大小的拉应力和压应力,通过测量承载钢筋的开路电位、腐蚀电流密度和交流阻抗等,对比了拉应力和压应力对砂浆中钢筋腐蚀的影响.结果表明:钢筋腐蚀随着应力增加而明显加剧;相同荷载作用下,承受压应力钢筋的开路电位和交流阻抗值更低、腐蚀电流密度更高,表明压应力对砂浆中钢筋的腐蚀影响更为明显.通过交流阻抗解析表明,应力破坏钢筋/混凝土界面、降低钢筋极化电阻是其加剧钢筋腐蚀的主要原因,而压应力降低钢筋/混凝土界面的极化电阻较拉应力更为明显,因而它能更为显著地加剧钢筋腐蚀.
[Abstract]:The effects of tensile stress and compressive stress on the corrosion of steel bars in mortar were compared by measuring the open circuit potential corrosion current density and AC impedance of the loaded steel bar by applying different tensile and compressive stresses to the mortar specimens. The results show that the corrosion of steel bars increases obviously with the increase of stress, and under the same load, the open circuit potential and AC impedance of steel bars subjected to compressive stress are lower, and the corrosion current density is higher. The results show that the compressive stress has a more obvious effect on the corrosion of steel bars in mortar. By means of AC impedance analysis, it is shown that stress destroy the interface of steel bar / concrete and reduce the polarization resistance of steel bar is the main reason of aggravating the corrosion of steel bar, and the polarization resistance of the interface of steel bar / concrete is more obvious when the compressive stress reduces the interface of steel bar / concrete than the tensile stress. As a result, it can significantly aggravate the corrosion of steel bars.
【作者单位】：河海大学海岸灾害与防护教育部重点实验室;河海大学港口海岸与近海工程学院;江苏科技大学材料科学与工程学院;
【基金】：国家自然科学基金资助项目(51301060) 中央高校基本科研业务费专项资金资助项目(2013B03514) 水利部公益性行业科研专项经费项目(201301052) 高等学校学科创新引智计划资助项目(B12032)
【分类号】：TU511.3;TU578.1

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