混凝土在恶劣环境下的表面劣化机制研究

Research on surface deterioration mechanism of concrete in harsh environments

为了尽可能准确地了解浸水、冻融和磨损相互作用对混凝土表面劣化的影响,本研究使用了水灰比为0.54的加气混凝土和水灰比为0.62的非加气混凝土进行研究。结果表明,三种降解机制之间的相互作用造成的损伤量超过了分别由这三种机制造成的总损伤量。此外,浸水显著放大了两种混凝土混合物的冻融作用和磨损效应。在这些结构的水线处观察到的大部分表面损伤是由浸水和冻融作用造成的。研究结果对恶劣环境下水工建筑物混凝土表面的保护具有实际的指导意义。

In order to study the effects of the interaction between immersion,freeze-thaw cycles,and abrasion on the deterioration of concrete surfaces as accurately as possible,this paper employs aerated concrete with a water-cement ratio of 0.54 and non-aerated concrete with a water-cement ratio of 0.62.The results indicate that the damage caused by the interactions among the three degradation mechanisms exceeds the total damage caused by each mechanism individually.Furthermore,immersion significantly magnifies the freeze-thaw action and abrasion effects in both concrete mixtures.The majority of surface damage observed at the water line of these structures is attributed to immersion and freeze-thaw action.The findings of this paper provide practical guidance for protecting concrete surfaces in harsh environments,particularly in hydraulic construction projects.