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Study on corrosion activity of carbon steel in concrete simulated pore solution under static tensile and compressive stresses.

机译：静态拉伸和压缩应力作用下混凝土模拟孔隙溶液中碳钢的腐蚀活性研究。

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摘要

Reinforced concrete is a structure material made up of concrete with relatively lower tensile strength containing reinforcements with higher tensile strength and better ductility, which are embedded into fresh concrete to resist tensile stress in certain regions of concrete. Steel reinforced concrete is most widely used around the world in civil engineering structures, water conservancy and highway construction due to its durability strength and reasonable cost.;However, reinforced concrete structures such as bridges and parking lots slabs inevitably experience variable loads and constant degradation from the aggressive environments, such as marine and deicing salts. Therefore, it is imperative to study the synergic impact of different types of loadings and exposure to chloride ions on the corrosion of steel rebars. Clear understanding of such processes assists improving the resiliency of the structures and helps extending the service life of the constructions by modifying the design codes of structural steel, which will thus improve the durability and safety of next generation of sustainable infrastructures. In addition, it is necessary to understand the fundamental mechanism of steel passivation and depassivation processes in concrete under stresses, then more reliable and robust service life modeling tools can be made to help engineers predict the state and performance of rebar in concrete structures.;Hence, in order to obtain detailed understanding of the effect of both tensile and compressive stresses on passive film and the depassivation process, experiments were performed on steel immersed in concrete simulated pore solution under different types and degrees of loadings. Simulated concrete pore solution was chosen in order to obtain the results in a reasonable time frame required for this project. Several electrochemical measurement techniques were used. Besides, Mott-Schottky technique was utilized to investigate the semi-conductive behavior of the passive film, which is formed on the surface of the steel rebars. Results indicate that steel specimens in chloride free pore solution under tensile loadings passivate more rapidly compared to those under compressive loadings. However, the situation in chloride contaminated solution is different and steel under tensile stress exhibit more corrosion than that under compressive stress and no load.
机译：钢筋混凝土是一种结构材料，由抗张强度相对较低的混凝土组成，其中包含具有较高抗张强度和更好延展性的增强材料，这些增强材料被嵌入到新鲜混凝土中以抵抗混凝土某些区域中的抗张应力。钢筋混凝土由于其耐用强度和合理的成本而在世界范围内被广泛用于土木工程结构，水利和公路建设中;然而，诸如桥梁和停车场楼板之类的钢筋混凝土结构不可避免地承受着不断变化的载荷并因侵蚀性环境，例如海洋和除冰盐。因此，有必要研究不同类型的载荷和氯离子暴露对钢筋腐蚀的协同影响。对此类过程的清晰理解有助于改善结构的弹性，并通过修改结构钢的设计规范来帮助延长建筑的使用寿命，从而提高下一代可持续基础设施的耐用性和安全性。此外，有必要了解应力作用下混凝土中钢的钝化和钝化过程的基本机理，然后可以使用更可靠，更强大的使用寿命建模工具来帮助工程师预测混凝土结构中钢筋的状态和性能。为了深入了解拉应力和压应力对钝化膜和钝化过程的影响，在不同类型和程度的载荷下，将钢浸入混凝土模拟孔隙溶液中进行了实验。选择了模拟混凝土孔隙溶液，以便在该项目所需的合理时间内获得结果。使用了几种电化学测量技术。此外，还利用Mott-Schottky技术研究了形成在钢筋表面的钝化膜的半导电性能。结果表明，在拉伸载荷下，无氯孔隙溶液中的钢试样与在压缩载荷下相比，钝化速度更快。但是，氯化物污染溶液的情况有所不同，在拉伸应力下的钢比在压缩应力下且无负荷的钢表现出更多的腐蚀。

著录项

  • 作者

    Zhang, Yujie.;

  • 作者单位

    Clemson University.;

  • 授予单位 Clemson University.;
  • 学科 Engineering General.;Engineering Materials Science.;Engineering Chemical.
  • 学位 M.S.
  • 年度 2012
  • 页码 71 p.
  • 总页数 71
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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