中文摘要：

构建了混凝土碳化的数值仿真模型,并确定了相关参数的取值。采用碳化程度系数作为碳化分析结果的量化表征参数,确定了碳化锋面的碳化程度系数阈值。通过对有限元软件热分析模块中计算参数的合理化等效,实现了混凝土碳化过程的数值仿真分析。分析结果与参考文献试验结果进行对比,证明了理论模型和所选相关参数的合理性,为普通大气环境下混凝土结构的碳化仿真分析和寿命预测提供了一种较为准确便捷的方法,并基于该方法对某地区CRTSⅡ无砟轨道板在设计使用年限内的碳化发展情况进行了分析预测。

英文摘要：

A theoretical model of concrete carbonation process was built up,and some parameters were determined.The coefficient of carbonation degree was adopted as the parameter to characterize quantity for the concrete carbonation.When the threshold value of carbonation degree on the carbonation front was determined,the carbonation depth could be analyzed.Furthermore,the numerical analysis for concrete carbonation was realized by the equivalent parameter conversions in the heat conduction module of general finite element software.A specimen in the reference was analyzed for the concrete carbonation by the method,and the analysis results are consistent well with the test results.So it is shown an accurate and convenient numerical simulation method for the carbonation process analysis and life prediction of concrete structures in the atmosphere environment.Based on the method,the carbonation development of the Chinese Railway Track System（CRTS）Ⅱ ballastless track slab was analyzed in designed service life.