混凝土的碳化是影响钢筋混凝土耐久性的一个重要指标。所谓混凝土的碳化效应,是指混凝土中的碱性物质(主要是氢氧化钙)与空气中的二氧化碳作用生成碳酸钙,使水泥石孔结构产生变化、混凝土碱度下降并渐变为中性,从而使钢筋失去保护作用而易于锈蚀,混凝土耐久性受到严重影响的效应。本文选用以下三个指标表征碳化应的大小:(1)平均碳化深度(X_i);(2)碳化速度系数(α);(3)水泥石的碱度(pH)值。本文的试验采用人工常压高浓 The carbonation of concrete is an important indicator of the durability of reinforced concrete. The so-called carbonization effect of concrete means that the basic substance (mainly calcium hydroxide) in the concrete reacts with the carbon dioxide in the air to generate calcium carbonate, so that the pore structure of the cement stone changes, the alkalinity of the concrete decreases, and the gradient becomes neutral, thus The steel bars lose their protective effect and are easily rusted, and the durability of the concrete is seriously affected. This article uses the following three indicators to characterize the size of carbonation: (1) the average carbonization depth (X_i); (2) the carbonization rate coefficient (α); (3) the alkalinity (pH) value of the cement. The test in this paper uses artificial atmospheric pressure and high concentration.