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建筑结构中的混凝土材料在遇到火灾时,往往会暴露在高温的作用下,而高温作用后混凝土的相关性能对建筑物的使用安全性至关重要。本文介绍了高温对混凝土的物理性能和力学性能的影响。混凝土试块会经过相对较低温度(小于300℃)和相对高的温度作用,并通过不同的冷却方式后得到混凝土试块的抗压强度。高温作用后混凝土的抗压强度会严重劣化,混凝土的剩余强度也随着冷却制度的不同而不同。随着温度的升高,混凝土的断裂能逐渐降低。且高温作用后混凝土抗毛细吸水性能严重劣化,喷水冷却后混凝土的毛细吸水能力显著增大。
Concrete structures in building structures are often exposed to high temperatures in the event of a fire and the associated properties of concrete after high temperatures are crucial to the safety of the building. This article describes the impact of high temperature on the physical and mechanical properties of concrete. The concrete test block will pass the relatively lower temperature (less than 300 ℃) and relatively high temperature, and through different cooling methods to get the compressive strength of concrete test block. After high temperature concrete compressive strength will be seriously deteriorated, the residual strength of concrete also varies with the cooling system. As the temperature increases, the fracture of concrete can be gradually reduced. After the high temperature, the anti-capillary water absorption performance of the concrete is seriously deteriorated, and the capillary water absorption capacity of the concrete after water cooling is significantly increased.