多因素协同作用下混凝土碳化深度预测模型研究

Study on concrete carbonation depth prediction model under co-influence of multi-factor

混凝土碳化是导致混凝土坝服役性能降低的内在因素之一,为保证混凝土坝长效健康服役,应揭示混凝土碳化随时间的演变规律。基于多孔介质理论,以混凝土孔结构为基础,从决定碳化的基本物理化学条件出发,研究了冻融和应力作用对混凝土孔隙率变化的影响,并据此建立了多因素协同作用下混凝土碳化深度预测模型。试验数据验证结果表明,所建立的预测模型有效性较好。

Concrete carbonization is one of the intrinsic factors that may cause service performance degradation of concrete dam. In order to ensure the long- lasting service of concrete dam,the evolution law of concrete carbonation should be revealed.Based on the porous media theory and the concrete pore structure,and starting from the basic physical- chemical conditions of carbonization,the influence of freezing- thawing circles and stress states on the variation of concrete porosity is studied. According to the study results,a multi- factor prediction model of carbonization depth is established. The effectiveness of the proposed model is verified by numerical study.