中文摘要：

旨在研究混凝土在应力和碳化共同作用下的损伤机理。试验采用无应力、拉应力、压应力3种试件进行了快速碳化试验。测量了受力在0,0.15,0.3,0.45,0.6,0.75倍拉/压设计强度下的混凝土的碳化深度。实验结果表明,拉、压应力分别加快和减缓了混凝土碳化速率,且应力越大,对混凝土碳化的影响也越大。说明应力对混凝土碳化耐久性的影响是显著的。与此同时,在考虑应力影响系数的情况下,结合使用条件建立了大气环境中应力状态下混凝土碳化深度的预测模型。通过计算值和实验值的计算对比,证明了该模型的有效性。

英文摘要：

This paper studied the concrete damage mechanisms under both stress and carbonation at the same time.High-speed carbonation experiments were performed on specimens without stress,with tensile stress and with compressive stress.Carbonation depths of the concrete were measured for stress level of 0,0.15,0.3,0.45,0.6,0.75 times of tensile / compressive design strength.The results show that tensile stress and compressive stress can accelerate or decelerate the concrete carbonation,and carbonation increases with compressive stress.The fact indicates that stress has great impact on concrete carbonation durability.A model forecasting the concrete carbonation depth under atmospheric environment was established considering the actual condition and stress influence coefficients.Comparison of the calculations with test results validated the model＇s efficacy.