氯离子腐蚀对钢管混凝土界面黏结性能影响的试验分析

为考察钢管混凝土界面黏结性能与腐蚀时间的关系,在钢管内表面涂抹3.5%浓度的NaCl溶液,进行钢管混凝土在腐蚀环境中的模拟试验,以腐蚀时间为基本参数,完成了10根圆钢管混凝土试件的推出试验。结果表明,钢管混凝土在腐蚀初期,钢管与混凝土的黏结力有所提高,随着腐蚀时间延长,界面黏结力下降并趋于平稳。根据试验结果,得出各个试件的荷载-滑移曲线;结合碳钢在NaCl环境中的腐蚀机理,分析腐蚀对钢管混凝土界面黏结性能的影响,研究钢管混凝土腐蚀时间与界面黏结力的内在联系。

EXPERIMENTAL ANALYSIS OF CFST INTERFACE BONDING PROPERTY BY CORROSION OF CHLORINE ION

In order to research the interface bonding property of concrete-filled steel tube(CFST) with the corrosion time,simulation test of CFST was done in corrosion environment,in which application of 3.5%NaCl solution to the inner surface of steel pipe.It was completed the push-out tests on 10 round CFST specimens with the corrosion time as basic parameters.The test results indicated that concrete-filled steel tube bond strength was increased in the initial stage of corrosion,with the corrosion time extension,the interface bonding strength appeared to decline and tended to be steady.Based on the test results,the load-slip curves of each specimen were obtained.It was analysed the corrosion influence on the CFST interface bonding property,and researched internal links of corrosion time with interface bonding strength through the carbon steel in NaCl corrosion mechanism.