| 摘要: |
| 结合理论分析、数值模拟和模型试验数据，分析了温度和相对湿度对混凝土中钢筋腐蚀控制模式及速率的影响规律.首先基于混凝土中钢筋腐蚀的电化学原理，并考虑电极反应的逆向反应速率对活化极化过电位的影响，改进了传统钢筋腐蚀宏电池模型中的阳极腐蚀电位；然后分析了温度和相对湿度对平衡电位、交换电流密度、极限电流密度等参数的影响，建立了能够有效考虑温度和相对湿度影响的钢筋腐蚀宏电池模型；最后利用人工和自然气候环境下的试验数据，对比验证了所建模型的有效性，并分析了温度和相对湿度对混凝土中钢筋腐蚀控制模式及速率的影响规律. |
| 关键词: 混凝土 钢筋 腐蚀速率 温度 相对湿度 腐蚀控制模式 |
| DOI：103969/j.issn1007 9629201605010 |
| 分类号: |
| 基金项目:国家自然科学基金资助项目(51368006)；广西科技开发项目(桂科转15989 10)；广西重点实验室系统性研究项目(2013ZDX06) |
|
| Influences of Temperature and Humidity on Control Mode and Rate of Reinforcing Steel Corrosion |
|
YU Bo, ZHAN Leiying, LIU Jianbo, YANG Lufeng
|
|
College of Civil Engineering and Architecture, Guangxi University, Nanning 530004, China
|
| Abstract: |
| Influences of temperature and relative humidity on the control mode and rate of reinforcing steel corrosion were investigated by combining the theoretical analysis, numerical simulation and experimental data. First, the anodic corrosion potential in the traditional macro cell corrosion model was improved by taking into account the influence of reverse reaction rate on the activation polarization over potential and based on the principle of electrochemical corrosion. Then the influences of temperature and relative humidity on the various electrochemical parameters, such as the equilibrium potential, exchange current density and limiting current density, were discussed; mean while, an improved macro cell corrosion model of reinforcing steel embedded in concrete was developed which takes into account the temperature and relative humidity. Finally, the applicability and efficiency of the developed model were validated by comparing with the experimental data of both artificially accelerated and natural corrosion experiments; furthermore, the influences of temperature and relative humidity on the control mode and rate of reinforcing steel corrosion were investigated. |
| Key words: concrete reinforcing steel corrosion rate temperature relative humidity corrosion control mode |
