Experimental and Empirical Time to Corrosion of Reinforced Concrete Structures under Different Curing Conditions

Abouhussien, Ahmed A.; Hassan, Assem A. A.

doi:10.1155/2014/595743

Cited by 20 publications

(13 citation statements)

References 6 publications

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“…The chloride diffusion process is commonly modelled through analytical or empirical approaches available in the literature [19]- [21]. Among them, it is worth citing the Fick's approach [22]- [25].…”

Section: Introductionmentioning

confidence: 99%

Probabilistic corrosion time initiation modelling in reinforced concrete structures using the BEM

Pellizzer

Leonel

2020

Rev. IBRACON Estrut. Mater.

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The reinforcement’s depassivation in reinforced concrete structures occurs when the chloride concentration at the reinforcement’s interface reaches the threshold content. The depassivation phenomenon starts the propagation period, in which huge mechanical degradation processes are triggered. Moreover, it is well established that the propagation period is considerably shorter than the initiation period. Therefore, the accurate prediction of the corrosion time initiation is a major issue in structural durability domain. This study presents a transient formulation based on the Boundary Element Method (BEM) for the corrosion time initiation assessment. The diffusion fields evaluated by the BEM are utilized into a probabilistic framework, which enables the assessment of probabilistic values for corrosion time initiation. Therefore, the formulation handles properly the uncertainties in this problem, which is largely subjected to randomness. Three applications are presented. The robustness and accuracy of the proposed approach over classical analytical models are highlighted.

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Section: Introductionmentioning

confidence: 99%

Probabilistic corrosion time initiation modelling in reinforced concrete structures using the BEM

Pellizzer

Leonel

2020

Rev. IBRACON Estrut. Mater.

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“…A few investigators found sulfate attack produced ettringite, and this process had two stages. e ettringite was strengthened due to its crystallization in the first stage; the ettringite was weakened because of overexpansion and modeling to verify its rationality and validity in the second stage [23,24]. Some investigators also used high resolution synchrotron X-ray diffraction (SyXRD) to analyze microstructural profile of concrete deterioration which was attacked by sulfate [25][26][27].…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Diffusion Process of Sulfate Ion in Cemented Gangue Backfill Material

Yao

Wang

Feng

et al. 2020

Advances in Civil Engineering

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Cemented gangue backfill material (CGBM) is made of coal gangue, fly ash, cement, and water. The backfill body will be corroded by mine water that contains different kinds of corrosive ions. The paper mainly aimed to study the diffusion process of sulfate ion (SO42−) in CGBM. Soluble salt solutions with different concentrations are prepared to simulate various mine water. The SO42− concentration was measured by layered sampling method and chemical analyzing method. The diffusion coefficient was calculated according to the second Fick’s law. Scanning electron microscope (SEM) and X-ray diffraction (XRD) were used to analyze the degradation mechanisms. The experimental results showed that the SO42− concentration increases in CGBM when the external sulfate solutions concentration increases. With the increasing of magnesium ion (Mg2+) concentration and bicarbonate ion (HCO3−) concentration in the external corrosion solutions, the diffusion coefficient of SO42− was increased, and HCO3− has more significant effects than Mg2+. SO42− reacting with CGBM produced ettringite and gypsum. The ettringite and gypsum changed the pore structure of hardened CGBM and affected the compressive strength of hardened CGBM. Studying the diffusion of SO42− can contribute to predicting the service life of CGBM.

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“…For the latter, there are many kinds of maintenance actions in the market [13,14]. To efficiently apply these actions, maintenance (or repair) application times, such as the time prior to reinforcement corrosion [15,16], are of significance. erefore, a method to predict the appropriate repair application time, which was occasionally defined as service life [17,18], is required.…”

Section: Introductionmentioning

confidence: 99%

Probability-Based Sensitivity of Service Life of Chloride-Attacked Concrete Structures with Multiple Cover Concrete Repairs

Petcherdchoo

2018

Advances in Civil Engineering

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This paper presents probabilistic and sensitivity analysis of service life (or time to repairs) for attaining corrosion-free condition of concrete structures under chloride attack. Four groups of probabilistic parameters are determined, i.e., (1) time-dependent chloride content, (2) mean and median of corrosion initiation and repair application times, (3) percent confidence of repairs, and (4) total expected number of repairs. To achieve this, this paper proposes a computational approach and probabilistic data. The proposed approach, which combined the Latin Hypercube technique with the Crank–Nicolson-based finite difference approach, is developed for predicting probabilistic chloride diffusion in concrete with repairs by cover concrete replacement. Probabilistic data of four governing random variables (surface chloride, diffusion coefficient, concrete cover depth, and critical chloride) and six repair strategies for corrosion-free condition are introduced. Numerical assessment is then shown. From the study, it is revealed that the reduction of the amount of chloride ions at the threshold depth due to using higher depth of cover concrete repairs is better than that using higher quality of repair materials. However, the excessive depth of repairs is not always recommended due to another control factor, such as the immediate amount of chloride ions at the repair depth, cost of repairs, etc. From the sensitivity analysis, the cover depth is found to be the most important parameter in the design of chloride-attacked concrete structures to extend the corrosion initiation and repair application times and to reduce the total expected number of repairs.

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Experimental and Empirical Time to Corrosion of Reinforced Concrete Structures under Different Curing Conditions

Cited by 20 publications

References 6 publications

Probabilistic corrosion time initiation modelling in reinforced concrete structures using the BEM

Probabilistic corrosion time initiation modelling in reinforced concrete structures using the BEM

Experimental Study on Diffusion Process of Sulfate Ion in Cemented Gangue Backfill Material

Probability-Based Sensitivity of Service Life of Chloride-Attacked Concrete Structures with Multiple Cover Concrete Repairs

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