基于氯离子分布的氯离子渗透参数计算的新方法

根据混凝土中氯离子的分布对氯离子侵入性能进行评价时,混凝土粉末样品的采集,氯离子含量的测试和表达方式,均可对评价结果产生影响。在干湿循环条件下,以理论上的表面氯离子浓度为主要评价参数对氯离子的渗透性能进行评价的方法不尽合理。通过对暴露26年后的青岛北海船厂码头中大量的混凝土芯样中氯离子分布的分析和计算,结合其它文献中氯离子分布的数据,提出了以扩散区与对流区界面为扩散表面,以界面处的氯离子浓度为扩散表面浓度,评价氯离子侵入性能和进行寿命预测的方法。

A New Approach to Evaluate Penetration Coefficients of Chloride Ion Based on Chloride Profiles

In disposal the chloride profiles of concrete after a period of exposure,the manners of collecting concrete powder,measuring and expressing chloride contents all can influence the evaluating results.In different periods and different environments,the forms of chloride profiles are different.It's not reasonable to use the apparent surface concentration as main coefficient in evaluating chloride invading character.By analyzing and comparing,an approach which using interface of convection zone and diffusion zone as the diffusion surface,and using the chloride concentration in interface as diffusion surface concentration is suggested to evaluate invading character of chloride ion and predict lifespan of structure.