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Experimental study of sodium fire and its characteristics under the coupling action of columnar liquid sodium flow and concrete

机译：稳定性液体钠流量和混凝土偶联作用下钠火及其特征的实验研究

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The complex coupling relationship between liquid sodium and concrete materials affects both the sodium fire characteristics and concrete properties through heat and chemical erosion. In this study, experiments on direct and indirect (separated by a steel plate) contact of the columnar sodium fire with the concrete surface were performed. It was found that the combustion efficiency of liquid sodium in direct contact with concrete was significantly enhanced and accompanied by intermittent explosions and splashing of small concrete fragments. The sodium fire on the surface of the concrete considerably increased the internal temperature, pore size, and distribution density of the concrete. In addition, the depth of influence on the loosening of the concrete structure was also greatly extended. The contact of liquid sodium with the concrete substantially affected its permeability resistance. The water absorption of the concrete surface was increased by more than 70% when liquid sodium directly impacted the bare concrete surface. However, the change in water absorption in the centre of the concrete was primarily affected by the duration of the external heat.
机译：液体钠和混凝土材料之间的复合耦合关系通过热化和化学侵蚀影响钠火特性和混凝土特性。在该研究中，进行了与混凝土表面的直接和间接（由钢板分开）的实验与混凝土表面接触。结果发现，与混凝土直接接触的液体钠的燃烧效率显着增强，并伴随着间歇性爆炸和小型混凝土碎片的溅起。混凝土表面上的钠灯显着增加了混凝土的内部温度，孔径和分布密度。此外，对混凝土结构松动的影响深度也大大延伸。液体钠与混凝土的接触基本上影响其渗透性耐受性。当液体钠直接撞击裸露的混凝土表面时，混凝土表面的吸水量增加了70％以上。然而，混凝土中心的吸水变化主要受到外部热持续时间的影响。

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