Diffusion Behavior of Chloride Ions in Concrete Box Girder under the Influence of Load and Carbonation

Ying-long, Liu; Lin, Pengzhen; Ma, Jixin

doi:10.3390/ma13092117

Cited by 5 publications

(5 citation statements)

References 29 publications

(46 reference statements)

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“…Among them, the 28-day measured compressive strength of concrete used for indoor accelerated carbonation is 49.6 MPa. The specific size, mix proportion, and material composition of the concrete box girder model can be found in the literature [42].…”

Section: Formula Verificationmentioning

confidence: 99%

Statistical Modelling of Carbonation Process in Reinforced Concrete Structure

Liu

Lin

et al. 2022

Materials

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In order to quantitatively analyze the factors affecting the carbonation of reinforced concrete structures, the carbonation coefficient model is established based on 1834 groups of test data from natural carbonation and indoor accelerated tests in this paper. The main factors considered in the statistical model are the environmental temperature, the concentration of carbon dioxide, relative humidity, water–cement ratio, fly ash replacement, compressive strength of 28 days, curing time, compaction type, exposure to a salt environment, and environmental exposure classes. Based on the multiple nonlinear regression method, the carbonation coefficient model is fitted in two sections according to the different environmental exposures of the concrete structure. To analyze the applicability of the formula, the statistical formulas of relative humidity less than 70% and relative humidity higher than 70% are verified by the test data, and satisfactory results are obtained. Based on the quantitative analysis of the statistical model, the specific effects of relative humidity, strength, carbon dioxide content, fly ash, and curing time on concrete carbonation are clarified. The results show that the factors affecting carbonation are also different with different humidity values in the exposed environment of the concrete structure. When the relative humidity of the exposed environment is less than 70%, the parameters that have a great impact on concrete carbonation are fly ash replacement, compressive strength of 28 days, relative humidity, and the concentration of carbon dioxide. Among them, fly ash replacement, relative humidity, and the concentration of carbon dioxide can promote the carbonation of concrete. When the relative humidity of the exposed environment is higher than 70%, the parameters that have a great impact on concrete carbonation are the concentration of carbon dioxide, relative humidity, compressive strength of 28 days, curing time, and exposure classes. Only the concentration of carbon dioxide is conducive to the carbonation of concrete, and relative humidity has a very significant effect on concrete carbonation.

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Section: Formula Verificationmentioning

confidence: 99%

Statistical Modelling of Carbonation Process in Reinforced Concrete Structure

Liu

Lin

et al. 2022

Materials

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“…The steel, which is initially shielded by the concrete coating, can lose its protective properties due to either carbonation caused by carbon dioxide or the infiltration of chloride ions from seawater, sea spray, or de-icing salts [4]. This phenomenon poses a greater risk when the structure is exposed to mechanical strain [5] and deteriorates progressively [6], [7]. The interplay between stress levels and age contributes to a fluctuation in the diffusion coefficient, thereby expediting the progression of mechanical or physicochemical pathology that can impact concrete.…”

Section: Introductionmentioning

confidence: 99%

Numerical modeling of the behavior of concrete exposed to chloride ions by coupling age and mechanical stresses

Bendjaiche,

Boudjehm,

Nafa

et al. 2024

J. Eng. Exact Sci.

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This study proposes a quantitative examination of the issue of chloride ion infiltration in concrete under mechanical strain in a hostile setting while considering the influence of time, commonly referred to as the aging effect. The relationship between the diffusion coefficient and age, when subjected to specific levels of uniaxial or biaxial stresses for various W/C ratios, has allowed us to assess the concentration of chloride ions and the time needed for corrosion to begin through the coating layer in three dimensions. The numerical model results corroborate the notion that the corrosion process is affected by the fluctuation of the diffusion coefficient, which is directly linked to the age factor and the mechanical stresses exerted on the concrete. The model also emphasizes the extended distribution of chloride ion concentration at a certain depth, which is connected to the ratio of water to cement, influenced by the diffusion coefficient and the degree of mechanical stress in older structures.

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“…The authors in Refs. [28][29][30][31] analyzed the influence of chloride ions and described the electroosmotic effect as a process of movement intensification in capillary-porous objects. The analyses showed that this process can descriptively characterize the electrochemical reaction of oxygen reduction in concrete, as well as the electrolysis of water.…”

Section: Introductionmentioning

confidence: 99%

Effect of Electrochemical Corrosion on the Properties of Modified Concrete

Gordina

Gumenyuk

Polyanskikh

et al. 2023

Construction Materials

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Analysis of the use of reinforced concrete structures confirmed the destruction of reinforced products based on Portland cement due to stray currents, which makes it impossible to achieve the required durability and reliability of structures. The present work shows the results of a study on the diffusion permeability of samples with different degrees of electrical conductivity. The relative value of the electrode potential was measured by the open circuit potential method. The novelty of this work is its analysis of the quantitative and qualitative characteristics of the structure of the mineral matrix with specified electrical properties after long-term exposure to electrochemical corrosion. In this work, an assessment was carried out, for the first time, on the effects of electrochemical corrosion on modified composites with predominantly electrically conductive and electrically insulating properties. An increase in the electrical conductivity of the composite was found to reduce the potential difference. The use of such composites helped protect the reinforcement from electrochemical corrosion.

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Diffusion Behavior of Chloride Ions in Concrete Box Girder under the Influence of Load and Carbonation

Cited by 5 publications

References 29 publications

Statistical Modelling of Carbonation Process in Reinforced Concrete Structure

Statistical Modelling of Carbonation Process in Reinforced Concrete Structure

Numerical modeling of the behavior of concrete exposed to chloride ions by coupling age and mechanical stresses

Effect of Electrochemical Corrosion on the Properties of Modified Concrete

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