碳化作用下安全壳混凝土结构耐久性研究

Study on durability of containm ent concrete structure under the action of carbonation

安全壳混凝土结构因其特殊性,对其耐久性方面研究成果较少,而碳化作用作为混凝土老化的主要机理之一,应进行重点研究。对安全壳混凝土试块进行快速碳化试验,取得不同龄期下安全壳混凝土碳化深度的变化规律;基于此规律,结合安全壳的实际环境因素,得出安全壳碳化深度随机预测模型。以碳化深度到达保护层厚度作为失效标志,使用Monte Carlo模拟得到不同服役年限下安全壳的失效概率,并拟合得出安全壳碳化失效随机概率预测模型。

The research achievements of containment concrete structure durability is less due to its particularity, and carbonation should be focused on as is one of the main mechanism of concrete aging. The change regulation of concrete carbonation depth at different ages was obtained by the fast carbonization testing on containment concrete specimens, based on this regulation, combining the actual envi- ronmental factors of containment, the random prediction model of containment carbonization depth was obtained.Making the carbonation depth reaches the protection layer thickness as a failure indicate ,the failure probability of containment at different service life was respec- tively given by Monte Carlo simulation and the random prediction model for containment carbonization failure was obtained by fitting.