%A Hai-long WANG,Yuan-jian WU,Jia-yan LING,Xiao-yan SUN %T Bond degradation between corroded stainless steel bar and concrete %0 Journal Article %D 2020 %J Journal of ZheJiang University (Engineering Science) %R 10.3785/j.issn.1008-973X.2020.05.001 %P 843-850 %V 54 %N 5 %U {https://www.zjujournals.com/eng/CN/abstract/article_41335.shtml} %8 2020-05-01 %X

The direct pullout tests under different corrosion rates were conducted to evaluate the bond performance between the corroded stainless steel bar and the concrete. The influences of corrosion rate and surface crack width on the bond degradation were analyzed, and then predictive formulas of bond strength between the stainless steel bar and the concrete were given respectively based on the corrosion rate and the surface crack width. The differences of bond properties between ordinary and stainless steel reinforced concretes were compared. Test results show that the bond strength between corroded stainless steel bar and concrete increases firstly and then decreases as the increase of corrosion rate, which is similar to that of the ordinary reinforced concrete, however the critical corrosion rate of stainless steel affecting the bond strength is higher than that of ordinary reinforcement. Pitting corrosion has strong randomness, which leads to the discrete relationship between the corrosion crack width and corrosion rate. Compared with the model based on the corrosion rate, the predictive model based on the surface crack width has a better agreement with the test results, and is of better practicability. The degradation amount of bond strength of stainless steel reinforced concrete is smaller than that of ordinary reinforced concrete at a same corrosion degree. The existing bond degradation model of ordinary reinforced concrete can be used to descript the stainless steel reinforced concrete directly and has a certain safety stock.