冻融对混凝土碳化的影响

Influence of freezing and thawing on carbonation of concrete materials

为研究冻融对混凝土碳化的影响,对4种不同配合比混凝土先后进行冻融循环和加速碳化,测定其CaCO3含量,并采用Boltzmann函数拟合碳化深度值。结果表明,冻融作为混凝土损伤的动力源,加速碳化进程,循环次数越多,碳化后CaCO3含量和相应的碳化深度越大;在冻融和高浓度CO2环境下,粉煤灰的掺入增加混凝土碳化量,对混凝土结构不利。

In order to investigate into the effect of freezing and thawing on carbonation of concrete, four different types of concrete had been studied after exposure to frost cycles and carbonation. Results show that, as a source of concrete deterioration, freezing and thawing action accelerates the carbonation process. CaCO3 content and carbonation depth become higher with increasing number of frost cycles. If exposed to frost cycles in an atmosphere with high CO2 content carbonation of concrete prepared with fly ash is particularly accelerated, which is disadvantage to concrete structure.