Study on Corrosion-induced Crack Initiation and Propagation of Sustaining Loaded RCbeams

International Conference on Computer Information and Automation Engineering

计算机科学;运输工程

Zhong, X.P.^1 ; Li, Y.^1 ; Yuan, C.B.^1 ; Yang, Z.^1 ; Chen, Y.^1

College of Civil Science and Engineering, Yangzhou University, Yangzhou, Jiangsu, China^1

关键词: Accelerated corrosion;    Calculation models;    Concrete cover thickness;    Corrosion induced crack;    Corrosion of steel bars;    Linear relationships;    Reinforced concrete beams;    Time varying behavior;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/359/1/012029/pdf
DOI  :  10.1088/1757-899X/359/1/012029

学科分类：计算机科学（综合）

来源: IOP

【 摘 要 】

For 13 pieces of reinforced concrete beams with HRB500 steel bars under long-term sustained loads, at time of corrosion-induced initial crack of concrete, and corrosion-induced crack widths of 0.3mm and 1mm, corrosion of steel bars and time-varying behavior of corrosion-induced crack width were studied by the ECWD (Electro-osmosis - constant Current - Wet and Dry cycles) accelerated corrosion method. The results show that when cover thickness was between 30 and 50mm,corrosion rates of steel bars were between 0.8% and 1.7% at time of corrosion-induced crack, and decreased with increasing concrete cover thickness; when corrosion-induced crack width was 0.3mm, the corrosion rate decreased with increasing steel bar diameter, and increased with increasing cover thickness; its corrosion rate varied between 0.98% and 4.54%; when corrosion-induced crack width reached 1mm, corrosion rate of steel bars was between 4% and 4.5%; when corrosion rate of steel bars was within 5%, the maximum and average corrosion-induced crack and corrosion rate of steel bars had a good linear relationship. The calculation model predicting the maximum and average width of corrosion-induced crack is given in this paper.