| 摘要: |
| 适当的弯曲半径可以抵消二维扩散作用下腐蚀物质侵入对钢筋腐蚀的影响.根据弯曲半径与氯离子二维扩散之间的关系，提出了氯离子环境下角部钢筋与中间部位钢筋同步腐蚀的数学模型.根据敏感性分析得出，在氯离子环境下，保证钢筋同步腐蚀所需的钢筋弯曲半径与氯离子扩散系数大小无关，与保护层厚度和临界氯离子浓度成正比，与表面氯离子浓度和初始氯离子浓度成反比.通过对T形梁的检测数据分析得出，钢筋保护层厚度检测应根据钢筋骨架三维图像，考虑弯曲半径与二维扩散的影响，对钢筋的腐蚀风险进行正确评价. |
| 关键词: 二维扩散 钢筋锈蚀 弯曲半径 氯离子 保护层 |
| DOI：103969/j.issn1007 9629201401009 |
| 分类号: |
| 基金项目:国家重点基础研究发展计划（973计划）项目（2009CB623203）；青岛市建设科技计划项目（JK2012 5） |
|
| Influence of Bending Radius of Reinforced Bars onCorrosion of Reinforced Bars |
|
FAN Hong1, ZHAO Tiejun2, WAN Xiaomei1
|
|
1.School of Civil Engineering, Qingdao Technological University, Qingdao 266033, China;2.The University Office, Qingdao Technological University, Qingdao 266033, China
|
| Abstract: |
| The corrosion of reinforced bars induced by intrusion of corrosive substances under 2D diffusion could be offset by setting proper bending radius. Relationship between the bending radius and the 2D chloride diffusion was investigated, and the bending radius to achieve synchronization corrosion of reinforced bars at the corner region and the middle region were deduced. Sensitivity analyses indicate that under chloride environments, the bending radius to ensure synchronization corrosion of the reinforced bars at the corner region and the middle region is not related to chloride diffusion coefficient, it is proportional to protective layer thickness and critical chloride concentration, and is inversely proportional to surface chloride concentration and initial chloride concentration. Through the analysis of the test data of T shape beam, the protective layer thickness of reinforced bars should be determined based on the 3D images of reinforced bars skeleton considering the influences of the bending radius and 2D diffusion effects, so that the risk of reinforced bar corrosion can be properly evaluated. |
| Key words: two dimensional diffusion reinforced bar corrosion bending radius chloride ion protect layer |
