This work analyses the impact of elevated temperature on the permeability and on the damage of concrete according to its saturation degree. The Young Modulus and gas permeability were measured on samples with different initial saturation degrees that were subjected to thermal loading (80, 150 and 200 °C). These conditions were defined to simulate the hydrothermal loading of nuclear plant concrete in case of accident. To analyse the behaviour of concrete exposed to high temperature, it is necessary to distinguish the effects of water saturation and the impact of damage on permeability. Experimentations shows that concrete with high saturation degree can be permeable to air after thermal loading, while it was not permeable before the loading. Relations are proposed to link the permeability variation to temperature according to the initial saturation degree of the concrete and to evaluate the permeability variation from the induced damage.

这项工作根据饱和度来分析高温对渗透率和混凝土损伤的影响。在具有不同初始饱和度的样品上测量了杨氏模量和气体渗透率，这些样品经历了热负荷（80、150和200°C）。定义这些条件是为了模拟发生事故时核电站混凝土的水热负荷。为了分析高温混凝土的性能，有必要区分水饱和度的影响和破坏对渗透性的影响。实验表明，饱和度高的混凝土在热加载后可以渗透空气，而在加载前则不能渗透。