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钢筋锈蚀是影响混凝土结构耐久性最重要的因素。钢筋锈胀体积膨胀,对周围混凝土产生压力,继而导致保护层的受拉开裂,出现锈胀裂缝,这对结构整体的安全性和耐久性十分有害。研究混凝土锈胀裂缝的抑制措施,对提高结构的耐久性具有重要意义。从结构构造入手,以快速通电加速纵向钢筋锈蚀的方法,研究了混凝土保护层厚度和箍筋间距对混凝土构件锈胀开裂的影响;同时通过计算机仿真,对试验构件进行了数值试验。在此基础上,建立了构件表面应力与混凝土保护层厚度及箍筋间距的相关关系,得到了不同保护层厚和箍筋间距对试件表面锈胀裂缝的影响规律。
Steel corrosion is the most important factor affecting the durability of concrete structures. Expansion of the rebar volume increases the pressure on the surrounding concrete, which in turn leads to tensile cracking of the protective layer and corrosive cracks that are very detrimental to the overall safety and durability of the structure. Research on the inhibition measures of concrete expansion cracks is of great significance to improve the durability of the structure. Starting from the structure structure, the method of accelerating the corrosion of longitudinal steel bar with quick electrification was studied, and the influence of concrete cover thickness and stirrup spacing on the corrosion cracking of concrete members was studied. At the same time, the numerical experiment of the test members was carried out by computer simulation. On this basis, the relationship between the surface stress of the member and the thickness of the concrete cover and the spacing of the stirrups has been established. The influence of different protective layer thicknesses and stirrups spacing on the corrosive cracks on the specimen surface has been obtained.