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首页> 外文期刊>Cement & concrete composites >Influence of calcium nitrite inhibitor and crack width on corrosion of steel in high performance concrete subjected to a simulated marine environment
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Influence of calcium nitrite inhibitor and crack width on corrosion of steel in high performance concrete subjected to a simulated marine environment

机译:模拟海洋环境下高性能混凝土中亚硝酸钙抑制剂和裂纹宽度对钢筋腐蚀的影响

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摘要

The effects of calcium nitrite based corrosion inhibitor (CNI) and crack width on the corrosion process of steel reinforcing bars in high performance concrete were investigated. A 3~4 full factorial design was developed considering water to cement ratio, fly ash percent, CNI and cracked condition as factors. The response was the corrosion current density measured using the linear polarization resistance technique. Small-scale concrete slabs containing steel reinforcement were cast in concrete with a cover depth of 20 mm. The slabs were subjected to a simulated marine environment with two cycles of wetting and drying per day. The specimens were also visually inspected on a regular basis. It was found that CNI alone, in general, has no effect in decreasing corrosion, and that the crack condition of the specimens strongly affects the corrosion process. A significant effect of crack width on corrosion was also found. Furthermore, non-detrimental effect of CNI on corrosion of specimens containing fly ash was detected.
机译:研究了亚硝酸钙基缓蚀剂(CNI)和裂纹宽度对高性能混凝土中钢筋腐蚀过程的影响。考虑水灰比,粉煤灰百分比,CNI和开裂条件作为因素,开发了3〜4个全因子设计。响应是使用线性极化电阻技术测得的腐蚀电流密度。将包含钢筋的小型混凝土板浇铸到覆盖深度为20 mm的混凝土中。将板坯置于模拟的海洋环境中,每天进行两次润湿和干燥循环。还定期目视检查样本。已经发现,一般而言,单独的CNI并不能减少腐蚀,并且试样的裂纹状况会严重影响腐蚀过程。还发现裂纹宽度对腐蚀有显着影响。此外,还检测到CNI对含粉煤灰样品腐蚀的无害影响。

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