Degradation of bond between steel bar and freeze-thaw concrete after electrochemical chloride extraction

来源期刊：中南大学学报(英文版)2010年第2期

论文作者：郭育霞 贡金鑫

文章页码：388 - 393

Key words：concrete; bond strength; degradation; electrochemical chloride extraction; freeze-thaw cycles

Abstract: The effect of electrochemical chloride extraction (ECE) on bond strength between steel bar and freeze-thaw concrete contaminated by chloride was experimentally investigated for beam specimens with dimensions of 100 mm×100 mm×400 mm. During the experiment, 3% NaCl (vs mass of cement, mass fraction) was mixed into concrete to simulate chloride contamination, and the specimens experienced 0, 25, 50, 75 freeze-thaw cycles before ECE. In the process of ECE, different current densities and durations were adopted. It is indicated that the bond strength between reinforcement and concrete decreases with the increase of freeze-thaw cycles; the more the current and the electric quantity of ECE are, the more the loss of bond strength is; and the largest loss is up to 58.7%. So, it is important to choose proper parameters of ECE for the reinforced concrete structures contaminated by chloride and subjected to freeze-thaw cycles.

基金信息：the Program of Innovative Team of the Ministry of Education of China