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对不同粉煤灰掺量(0%,20%,40%,60%)、不同应力比(0.20,0.35,0.50,0.65,0.80)下高性能混凝土一维和二维碳化规律展开研究;建立了荷载作用下二维碳化测试方法;定义了二维碳化交互系数;研究了不同应力比对交互系数的影响规律。试验表明:一维、二维碳化深度随着应力比的提高而增加,碳化28 d时(相当于自然碳化50 a),应力比为0.8时的一维、二维碳化深度分别是应力比为0时的1.61倍、1.39倍;同时,碳化深度服从应力比的指数函数关系;混凝土二维碳化具有显著的交互作用,荷载作用下的二维交互系数明显小于不受力时的交互系数,并且随着应力比的增加,其数值有变小的趋势。混凝土加载状态下的一维和二维碳化研究对混凝土结构耐久性和寿命预测具有现实意义。
One-dimensional and two-dimensional carbonation of high performance concrete with different fly ash contents (0%, 20%, 40%, 60%) and different stress ratios (0.20,0.35,0.50,0.65,0.80) Two-dimensional carbonation test method under load; define the two-dimensional carbonation interaction coefficient; study the impact of different stress ratio on the interaction coefficient. The results show that the one-dimensional and two-dimensional carbonation depths increase with the increase of the stress ratio. The one-dimensional and two-dimensional carbonation depths at 28 d of carbonization (equivalent to 50 days of natural carbonization) and at the stress ratio of 0.8 are respectively 0, 1.61 times and 1.39 times respectively. At the same time, the depth of carbonization obeys the exponential function of stress ratio. Two-dimensional carbonation of concrete has significant interaction, and the two-dimensional interaction coefficient under load is obviously smaller than that under no force As the stress ratio increases, the value tends to decrease. The research of one-dimensional and two-dimensional carbonation under the condition of concrete loading is of practical significance for the prediction of the durability and life expectancy of concrete structures.