摘要
用线性方法模拟碳化过程中混凝土的pH值随混凝土深度的变化曲线,并提出了一个pH值预测模型,该模型可以计算任意时刻、混凝土内部任意一点的pH值。用本文提出的pH值预测模型计算钢筋表面任一时刻的[OH-],用氯离子扩散模型计算钢筋表面任一时刻的[Cl-],以[Cl-]/[OH-]达到临界值作为钢筋锈蚀的条件,就可以预测混凝土内部钢筋开始锈蚀的时间,从而预测混凝土结构的使用寿命。
A curve that describes the concrete pH value changing with concrete depth is fitted by linear method, and a pH prediction model is proposed in this paper, by which the concrete pH value at any time and any concrete depth can be predicted. The [OH-] of concrete at any time could be calculated by the pH model proposed in this paper, and the[Cl-] of concrete at any time could be calculated by diffusion model. Regarding the critical value of[Cl- ]/[OH- ] as a criterion to judge whether the steel bar is corroded, the initial corrosion time of steel bar could be predicted. Consequently the service life of concrete structure could be predicted.
出处
《交通科技》
2009年第3期36-39,共4页
Transportation Science & Technology
关键词
寿命预测
混凝土pH值
初锈时间
life prediction
concrete pH value
initial corrosion time
