基于XCT技术的混凝土智能缓蚀系统性能表征

Corrosion Inhibition Performance Evaluation of Smart Concrete System by XCT

为优化对钢筋混凝土结构中钢筋的保护,设计了1套基于微胶囊的智能缓蚀系统(其中的微胶囊以乙基纤维素为囊壁,分别以单氟磷酸钠和亚硝酸钠为囊芯)并就其缓蚀性能进行了研究.利用XCT(X射线层析成像)技术进行钢筋锈蚀过程跟踪测试并对微胶囊的缓蚀效果进行了分析.结果表明:混凝土智能缓蚀系统对其中的钢筋起到了显著保护作用,缓蚀效果明显;在干湿循环试验中,相较于空白样,亚硝酸钠系统和单氟磷酸钠系统中的钢筋起锈时间分别延缓648,216h,开裂时间相应延缓432,144h;在干湿循环648h后,亚硝酸钠系统和单氟磷酸钠系统中的钢筋锈蚀率分别为1.93%,3.06%,均明显低于空白样(锈蚀率为10.46%).

In order to optimize the protection of reinforcing bar in concrete structure,the smart systems,including the sodium nitrite（NaNO2）/ethyl cellulose（EC）microcapsule system and the sodium monofluorophosphate（MFP）/ethyl cellulose（EC）microcapsule system,were designed and studied.XCT（X-ray computed microtomography）testing technology was used to trace the corrosion process and introduced to test the corrosion inhibition effect.The results show that the smart system has a very significant corrosion inhibition performance.Compared with the blank group in wet-dry cycle tests,sodium nitrite system and sodium monofluorophosphate system significantly delay initial corrosion period for 648 and 216 h,and the initial cracking period is also prolonged for 432 and 144 h,respectively.After 648 hof wet-dry cycle,the corrosion ratio of the sodium nitrite system is only 1.93%,and the sodium system is 3.06%,which is much lower than that of blank system＇s 10.46%.