Mechanism analysis and model calculation of chloride ion diffusion in reinforced concrete structure

Infrastructures near the sea, such as ports, offshore platforms, bridges, and coastal buildings, are affected by seawater due to the coastal region. Chloride, contained in seawater, causes a decrease in the strength and durability of the concrete. Some researchers have published a paper on analyzing the penetration of chloride ions into concrete under different coastal environments and predicted chloride diffusion in concrete with computational modeling. This paper aims to review the existing literature related to various laboratory work tests and analytical methods in evaluating the diffusion of chloride from seawater into concrete. A set of forty papers were collected and reviewed that were published from 2011 until 2020 for studying. The review showed that chloride diffusion was a complex process and affected by many factors such as material properties, curing time, immersion/exposure time, and environmental conditions. Various experimental methods in the Laboratory were conducted using concrete specimens made from various materials in the exposed and submerged conditions. Researches in the field were carried out on existing structures with a certain building age using non-destructive testing. Meanwhile, the analytical methods applied simple equations and numerical simulation computational software.

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“…-the slump values [15] [18] [26] [29] -concrete cover depth [3] [15] [28] [35] -permeability [22], impermeability [20];…”

Section: Independent Variables Dependent Variablesmentioning

confidence: 99%

Diffusion of chloride from seawater into the concrete analysis: a literature review on implemented approaches

Ariningsih

Nuralinah

Saputra

2021

IOP Conf. Ser.: Earth Environ. Sci.

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“…And it has been shown that the differences in chloride ion concentration in concrete will cause the change of concrete surface shape; when the chloride concentration exceeds a certain limit, it will cause the corrosion of the passivation film of concrete reinforcement, leading to cracks and accelerating the corrosion of concrete [21,22]. Wang [23] investigated coral aggregate concrete under alternating wet and dry conditions using the finite element software, and the chloride ion concentration was used as a key indicator.…”

Section: Introductionmentioning

confidence: 99%

Advances in Modeling Surface Chloride Concentrations in Concrete Serving in the Marine Environment: A Mini Review

Zhao,

Li,

Guan

2024

Buildings

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Chloride corrosion is a key factor affecting the life of marine concrete, and surface chloride concentration is the main parameter for analyzing its durability. In this paper, we first introduce six erosion mechanism models for surface chloride ion concentration, reveal the convection effect in the diffusion behavior of chloride ions, and then introduce the corrosion mechanisms that occur in different marine exposure environments. On this basis, the analysis is carried out using empirical formulations and machine learning methods, which provides a clearer understanding of the research characteristics and differences between empirical formulas and emerging machine learning techniques. This paper summarizes the time-varying model and multifactor coupling model on the basis of empirical analysis. It is found that the exponential function and the reciprocal function are more consistent with the distribution law of chloride ion concentration, the multifactor model containing the time-varying law is the most effective, and the Chen model is the most reliable. Machine learning, as an emerging method, has been widely used in concrete durability research. It can make up for the shortcomings of the empirical formula method and solve the multifactor coupling problem of surface chloride ion concentration with strong prediction ability. In addition, the difficulty of data acquisition is also a major problem that restricts the development of machine learning and incorporating concrete maintenance conditions into machine learning is a future development direction. Through this study, researchers can systematically understand the characteristics and differences of different research methods and their respective models and choose appropriate techniques to explore the durability of concrete structures. Moreover, intelligent computing will certainly occupy an increasingly important position in marine concrete research.

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Mechanism analysis and model calculation of chloride ion diffusion in reinforced concrete structure

Cited by 2 publications

References 8 publications

Diffusion of chloride from seawater into the concrete analysis: a literature review on implemented approaches

Diffusion of chloride from seawater into the concrete analysis: a literature review on implemented approaches

Advances in Modeling Surface Chloride Concentrations in Concrete Serving in the Marine Environment: A Mini Review

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