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首页> 外文期刊>Arabian Journal for Science and Engineering >Transport Modeling of Chlorides with Binding in Concrete
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Transport Modeling of Chlorides with Binding in Concrete

机译：混凝土中结合氯离子的迁移模型

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摘要

Chloride-induced corrosion is one of the most revealing cause of deterioration leading to premature durability loss by structural concrete. Among mechanisms governing penetration of chloride ions into the concrete, ingress by simple diffusion is the most decisive one for concentration-driven transport. The use of Fick's law of diffusion of the second type does in general permit a modest preliminary analysis of the diffusive transport subject to certain constraints, primarily associated with stationary chloride diffusion coefficient hypothesis. A realistic critique to such analysis based on constant chloride diffusivity is however its total disregard of intrinsic chloride-binding capacity evidently exhibited by cement-based materials constituent to the concrete. Given that the chlorides are also partly free and partly bound in concrete, the significance of chloride binding for a more accurate service life analysis of the concrete is of practical concern. Moreover, the challenge raised by chloride binding against the invariant diffusivity assumption cannot also be ignored, because only free chlorides diffuse into and through the bulk concrete to thereafter directly pose corrosion risk. Since chloride transport in cementitious material such as concrete based on one or another chloride-binding mechanism may also be quite different, careful choice of chloride-binding model, consistent with the underlying phenomenological behavior, is critical for its implication to service life predictions. The aim of this study is therefore to examine the effect of chloride binding in terms of their isotherm formulations on time to corrosion activation resulting from transport of chloride ions in saturated concrete. Numerical analysis employing nonlinear finite element modeling techniques is used to account for null, linear and nonlinear chloride-binding formulations,including Langmuir and Freundlich representations for the nonlinear types, on the chloride transport problem. Results of the analysis, in view of experimental chloride-binding and penetration profile data mined from the literature, are presented to quantifiably underscore the effects that various binding parameters significantly have on onset of chloride-induced corrosion in relation to specific durability requirements.
机译：氯化物引起的腐蚀是导致结构混凝土过早失去耐用性的最明显原因之一。在控制氯离子渗透到混凝土中的机制中，通过简单扩散进入是浓度驱动运输的最决定性因素。通常，使用第二类菲克扩散定律确实可以对扩散输运进行适度的初步分析，该分析受某些约束条件的影响，主要与固定氯离子扩散系数假设有关。然而，对基于恒定氯离子扩散率的这种分析的现实批评是，它完全忽略了水泥基材料在混凝土中所表现出的固有的氯离子结合能力。考虑到氯化物也部分游离和部分结合在混凝土中，因此氯离子结合对于更精确地分析混凝土使用寿命的重要性是实际关注的问题。而且，由氯离子结合不变的扩散性假设所引起的挑战也不能忽略，因为只有自由的氯离子扩散进入大块混凝土并通过大块混凝土，然后直接构成腐蚀风险。由于基于一种或另一种氯离子结合机理的水泥质材料（例如混凝土）中的氯离子运输也可能完全不同，因此，仔细选择与基本现象学行为相一致的氯离子结合模型对于其使用寿命预测至关重要。因此，本研究的目的是研究氯化物结合的等温线配方对在饱和混凝土中运输氯离子所引起的腐蚀活化作用的影响。使用非线性有限元建模技术进行的数值分析用于解释空的，线性的和非线性的氯离子结合公式，包括关于氯离子迁移问题的非线性类型的Langmuir和Freundlich表示。鉴于从文献中提取的实验性氯化物结合和渗透曲线数据，分析结果被提出以量化地强调各种结合参数对氯化物诱导的腐蚀相对于特定耐用性要求的显着影响。

著录项

  • 来源
    《Arabian Journal for Science and Engineering》 |2012年第2期|p.469-479|共11页
  • 作者

    M. A. Shazali; M. K. Rahman; A. H. Al-Gadhib; M. H. Baluch;

  • 作者单位

    INCO Precast Engineering, Industrial Contractors Co. Ltd.,Khobar, Saudi Arabia King Fahd University of Petroleum and Minerals, KFUPM, Box 1154, Dhahran 31261, Saudi Arabia;

    Research Institute, King Fahd University of Petroleum and Minerals, Dhahran, Saudi Arabia;

    Department of Civil Engineering, King Fahd University of Petroleum and Minerals, Dhahran, Saudi Arabia;

    Department of Civil Engineering, King Fahd University of Petroleum and Minerals, Dhahran, Saudi Arabia;

  • 收录信息 美国《科学引文索引》(SCI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    chloride binding; concrete; corrosion; diffusivity; durability; finite element; modeling;

    机译：氯化物结合;混凝土;腐蚀;扩散性;耐久性;有限元;造型;

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