荷载作用对混凝土碳化性能的影响

Influence of load on carbonation performance of concrete

对不同配合比混凝土试件先后进行加载和加速碳化试验,测定其中的CaCO3和Ca(OH)2含量,还利用Boltzmann函数对其含量曲线进行拟合得出碳化深度值。从结果可知,荷载作用作为碳化的动力源加速了碳化进程,施加荷载后其碳化深度相应增大;在荷载和高浓度CO2环境下,粉煤灰的掺入增加了混凝土的碳化量,对结构产生不利影响。

Loading and accelerating carbonation tests were successively conducted for the concrete sample of different mix proportions to measure its content of CaCO3 and Ca（OH）2, the carbonation depth value was obtained by using the function of Bohzmann to fit its content curve. The result showed that, the loading action, as the source of carbonation, accelerated the carbonation process, and the carbonation depth after loading was increased correspondingly. Under loading action and in an environment of high CO2 concentration, the addition of pulverized flY ash increased the carbonation of concrete, which was a disadvantage to the concrete structure.