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首页> 外文学位 >Performance of corrosion inhibitors and epoxy coatings in cracked reinforced concrete subjected to a marine environment.
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Performance of corrosion inhibitors and epoxy coatings in cracked reinforced concrete subjected to a marine environment.

机译：在遭受海洋环境的开裂钢筋混凝土中，缓蚀剂和环氧涂料的性能。

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摘要

Corrosion of embedded steel in concrete caused by chloride penetration is one of the major problems in structures exposed to harsh environments. Some of the most common corrosion protection methods are the improvement of the concrete in the form of High Performance Concrete (HPC), the use of Corrosion Inhibitors (CI) or the application of Fusion Bonded Epoxy Coatings (FBEC) to the reinforcing bars. Although considerable research has been carried out on the performance of these corrosion prevention methods, there are still many uncertainties about their performance, especially in cracked concrete and further research on the subject is needed. To provide a better understanding of the effect of calcium nitrite based corrosion inhibitor and epoxy coating rebars on the corrosion process of reinforced concrete, an extensive experimental program was carried out. 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 and a natural marine exposure. The effect of Calcium Nitrite Based Corrosion Inhibitor (CNI) and width of crack on the corrosion process of steel reinforcing bars in High Performance Concrete were investigated. A 34 full factorial design was developed considering water to cement ratio, fly ash percent, calcium nitrite based corrosion inhibitor content and crack width as factors. The responses were corrosion potential, corrosion current density, surface areas of corrosion, pit depth, chloride content and tensile strength of the reinforcing bars. It was found that CNI alone has, in general, no effect in decreasing corrosion, and that the crack condition of the specimens strongly affects the corrosion process in silica fume concrete. A significant effect of crack width on corrosion of ordinary portland cement concrete was also found but at early ages and as the time passes by this effect disappears. Furthermore, a non-detrimental effect of CNI on corrosion of specimens containing fly ash was detected. The study of seven types of epoxy coatings subjected to a simulated environment and testing of a structure built in 1984 and subjected to deicers during the winter revealed that epoxy coatings do not provide total protection to the steel reinforcing bars. However, coated bars significantly extend the corrosion initiation period as compared to uncoated bars for structures subjected to a very aggressive chloride environment.
机译：氯化物渗透引起的混凝土中嵌入钢的腐蚀是暴露于恶劣环境的结构中的主要问题之一。一些最常见的腐蚀防护方法包括以高性能混凝土（HPC）形式对混凝土进行改进，使用缓蚀剂（CI）或在钢筋上施加熔融粘结环氧涂料（FBEC）。尽管已经对这些防腐蚀方法的性能进行了大量研究，但是它们的性能仍然存在许多不确定性，特别是在开裂的混凝土中，还需要对该主题进行进一步的研究。为了更好地理解基于亚硝酸钙的缓蚀剂和环氧涂层钢筋对钢筋混凝土腐蚀过程的影响，进行了广泛的实验程序。将含有钢筋的小型混凝土板浇铸到覆盖深度为20 mm的混凝土中。这些板经受了模拟的海洋环境和自然的海洋暴露。研究了亚硝酸钙基缓蚀剂（CNI）和裂缝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，基于亚硝酸钙的缓蚀剂含量和裂纹宽度为因素，开发了3 4 全因子设计。响应是腐蚀电位，腐蚀电流密度，腐蚀表面积，坑深，氯化物含量和钢筋的拉伸强度。已发现，一般而言，仅CNI不会降低腐蚀，并且试样的裂纹状况会严重影响硅粉混凝土的腐蚀过程。还发现了裂缝宽度对普通硅酸盐水泥混凝土腐蚀的显着影响，但在早期，随着时间的流逝，这种影响消失了。此外，检测到CNI对含有粉煤灰的标本的腐蚀没有有害影响。对七种类型的环氧涂料进行的模拟环境研究以及对1984年建造的结构进行测试并在冬季进行除冰的研究表明，环氧涂料不能完全保护钢筋。然而，对于经受非常腐蚀性的氯化物环境的结构而言，与未涂覆的棒相比，涂覆的棒显着延长了腐蚀起始时间。

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  • 作者

    Montes, Pedro.;

  • 作者单位

    The University of New Brunswick (Canada).;

  • 授予单位 The University of New Brunswick (Canada).;
  • 学科 Engineering Civil.
  • 学位 Ph.D.
  • 年度 2003
  • 页码 241 p.
  • 总页数 241
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 建筑科学;
  • 关键词

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