箍筋约束锈蚀光圆钢筋与混凝土黏结性能试验研究

Experimental Research on Bond Performance between Corroded Plain Rebar and Concrete Confined with Stirrups

摘要: 钢筋与混凝土的黏结性能是衡量两者协同工作的重要指标。本文以锈蚀率和混凝土强度为影响因素，制作了96个中心拉拔试件，完成了箍筋约束下锈蚀光圆钢筋与混凝土拉拔试验。研究结果表明：由于箍筋的约束作用，光圆钢筋与混凝土的黏结滑移曲线的下降段较平缓。未锈蚀光圆钢筋与混凝土的黏结强度较小，锈蚀率为1%~13%的光圆钢筋与混凝土黏结强度有明显提高，锈蚀率大于13%的光圆钢筋与混凝土黏结强度出现下降趋势。锈蚀率相同时，混凝土强度对光圆钢筋与混凝土黏结强度的影响不明显，但对钢筋锈蚀速率有一定程度的影响，随着混凝土强度的提高，混凝土保护层胀裂所需的锈蚀时间延长。

Abstract: Bond performance between rebar and concrete is a very important index to evaluate their collaborative workability. Considering the influencing factors of corrosion ratio and concrete strength, this paper finished the pull-out tests of 96 specimens to investigate the bond performance between corroded plain rebar and concrete confined with stirrups. The results indicate that the descending part of bond-slip curves reduced gently due to the confinement of stirrups, bond strength was relatively lower between un-corroded plain rebar and concrete. An obvious and increased bond strength was given out when the corrosion ratio was 1%~13%, and a decreased trend was appeared on the bond strength when the corrosion ratio was over 13%. With similar corrosion ratio, concrete strength had no substantial influence on bond strength, while it had the influence on corrosion speed in certain degree. With the increase of concrete strength, the corrosion time was prolonged to lead the spalling of concrete cover.