混凝土保护层不均匀锈胀开裂研究

Study on Non-uniform Expansion Cracking of the Concrete Cover

随着国内外众多基础设施的建成,由于缺乏认识导致大量既有结构存在严重钢筋腐蚀问题,并已成为混凝土结构耐久性失效的最主要因素之一。文章在既有研究基础上,结合不均匀锈蚀特点,将保护层锈蚀损伤分为4个阶段,得到保护层开裂的锈蚀率与径向位移的关系,并对不同模型锈胀位移曲线展开分析。研究表明采用高斯分布和椭圆形分布曲线研究混凝土锈胀开裂是合理有效的。

A large number of many constructed infrastructures at home and abroad have serious corrosion problems in their structure due to inadequate understanding, and have become one of the most important factors to cause concrete structure durability failure. This paper, based on the previous studies and according to the characteristics of uneven corrosion, proposes to divide the corrosion damage into 4 stages, collects the relationship between the corrosion rate of the cracking of the concrete cover and the radial displacement, and analyzes the expansion displacement curves with different models. The research shows that the study of the expansion and cracking of concrete cover is reasonable and effective by adopting Gaussian distribution and elliptic distribution model.