多因素协同作用下混凝土碳化深度预测模型研究

摘要

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 concretedam.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 ofcarbonization, the influence of freezing -thawing circles and stress states on the variation of concrete porosity is studied .Accordingto the study results, a multi -factor prediction model of carbonization depth is established .The effectiveness of the proposedmodel is verified by numerical study.