中文摘要：

研究了苏通大桥各关键部位混凝土的一维、二维和三维碳化和加载状态下的一维、二维碳化；并结合大桥所处环境进行了基于混凝土二维和三维碳化的寿命预测。试验表明，混凝土的二维、三维碳化具有明显的交互作用；采用二维和三维碳化进行混凝土的寿命预测比传统的一维寿命预测分别要短42．3％和66．1％（以承台为例）；载荷作用下混凝土碳化明显增大，应力比为0．35时的一维、二维碳化寿命预测要比不受力时短36．7％和13．5％（承台）。

英文摘要：

This paper conducts a study of the one-, two- and three-dimensional carbonation of concrete of various critical parts of Sutong Bridge, the one- and two-dimensional carbonation of the concrete under loading and also makes prediction for the life of the concrete on the basis of the two- and three-dimensional carbonation in accordance with the environment where the Bridge is located. The results of the study indicate that the two- and three-dimensional carbonation of the concrete has an obvious effect of interaction, the life length prediction for the concrete （pier base） by means of the two- and three-dimensional carbonation is respectively 42.3% and 66.1% shorter than that predicted by the conventional one-dimensional carbonation. The carbonation of the concrete under loading is significantly increased, and the one- and two-dimensional carbonation life length prediction for the concrete （also the pier base） at stress ratio 0.35 is respectively 36.7% and 13.5% shorter than that of the concrete when it is not subjected to stress.