An investigation on the three-dimensional transport of chloride ions in concrete based on X-ray computed tomography technology

Tian, Ye; Chen, Changchang; Jin, Nanguo; Jin, Xin; Tian, Zushi; Yan, Dongming; Yü, Wei

doi:10.1016/j.conbuildmat.2019.05.144

Cited by 35 publications

(12 citation statements)

References 38 publications

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“…The concrete with a higher position had a higher porosity, which made its worse resistance to chloride penetration. At the same time, more coarse aggregates were deposited at the bottom part of the specimen, and the dilution and tortuosity effects would reduce the transport and diffusion properties of chlorides in the bottom area of the concrete 46–48 . For example, when the height was 150 mm, the chloride migration coefficient of NC and LWAC were only 3.32 × 10 −12 and 1.65 × 10 −12 m 2 /s, respectively.…”

Section: Resultsmentioning

confidence: 99%

Evaluating the chloride permeability of steel–concrete interface based on concretes of different stability

Cai

Zhang

Yang

et al. 2020

Structural Concrete

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The deterioration of reinforced concrete structures caused by chloride‐induced corrosion is a major threat to their service life. Previous studies show that defects in the steel–concrete interface have a significant impact on the corrosion process of steel bars. Study on the chloride permeability of steel–concrete interface is very important for revealing the mechanism. In this article, we devised a new experimental method named chloride penetration depth test which was used to evaluate the chloride permeability along the steel–concrete interface. Two types of fresh concretes, normal concrete (NC) and lightweight aggregate concrete (LWAC) with obviously different stability, were designed to obtain specimens of various defect sizes in the steel–concrete interface. The results show that the chloride penetration depth measured with the new method increased with the defect size in the steel–concrete interface determined by backscattered electron (BSE) imaging and nanoindentation technology, indicating that the chloride permeability of steel–concrete interface could be identified by the method we proposed.

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Section: Resultsmentioning

confidence: 99%

Evaluating the chloride permeability of steel–concrete interface based on concretes of different stability

Cai

Zhang

Yang

et al. 2020

Structural Concrete

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“…The corrosion process includes corrosion initiation of reinforcement (corrosion critical point) (Apostolopoulos et al, 2013;Wang et al, 2013) and concrete cover cracking (cracking critical point) (Reale and O'Connor, 2012;Jamali et al, 2013), which have generally been regarded as failure criteria for assessing the service life of RC structures (Bazant, 1979a;Bitaraf and Mohammadi, 2008;Matsumura et al, 2008;Pour-Ghaz et al, 2009;Jang and Oh, 2010;Leonid et al, 2010;AI-Harthy et al, 2011;Guzmán et al, 2011;Wang et al, 2018;Tian et al, 2019). Therefore, a large number of theoretical models have been investigated to predict these two important stages (Bazant, 1979a;Bazant, 1979b;Morinaga, 1990;Liu and Weyers, 1998;Wu, 2006;Maaddawy and Soudki, 2007;Tamer and Khaled, 2007;Bitaraf and Mohammadi, 2008;Matsumura et al, 2008;Wang et al, 2008;Pour-Ghaz et al, 2009;Jang and Oh, 2010;Leonid et al, 2010;Lu et al, 2010;Zhang et al, 2010;AI-Harthy et al, 2011;Guzmán et al, 2011;Jin and Zhao, 2014;Liu and Yu, 2016;Zhang et al, 2017;Wang et al, 2018;Tian et al, 2019;Lun et al, 2021). Such studies have established a strong theoretical background for the focus of this study.…”

Section: Introductionmentioning

confidence: 99%

Engineering vulnerability evaluation of building structures in coastal areas considering the effects of corrosion

Chi¹,

Xu²,

Liu³

et al. 2023

Front. Mater.

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Chloride-induced corrosion is an important factor that affects the durability of building structures in coastal areas; it causes serious deterioration of reinforced concrete (RC) structures and leads to structural failure. However, chloride-induced corrosion is a slow process which spans the whole service life of building structures, and many factors can affect their service life, such as location, structural design, and drug management. This paper aims to predict the service life of building structures in terms of chloride-induced corrosion and through the concept of engineering vulnerability. It first investigates the model of corrosion initiation of reinforcement, along with the consequent concrete cover cracking. Second, according to the characteristics of building structure and corrosion, it determines an evaluation index system of engineering vulnerability and establishes an evaluation method of engineering vulnerability, considering that corrosion is based on the AHP method and fuzzy comprehensive evaluation. Finally, using a case study of a pharmaceutical factory structure in a coastal city, this study verifies the feasibility of the assessment method considering corrosion effects.

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“…The experiment includes different concrete compositions and rebar orientations. A very interesting experiment is presented in [ 18 ]. The X-ray CT technique is applied to reconstruct the meso- and micro-structure of concrete as well as the chloride distribution in a specimen.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation of Non-Uniformly Distributed Corrosion in Reinforced Concrete Cross-Section

German

Pamin

2021

Materials

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Reinforced concrete structures can be strongly damaged by chloride corrosion of reinforcement. Rust accumulated around rebars involves a volumetric expansion, causing cracking of the surrounding concrete. To simulate the corrosion progress, the initiation phase of the corrosion process is first examined, taking into account the phenomena of oxygen and chloride transport as well as the corrosion current flow. This makes it possible to estimate the mass of produced rust, whereby a corrosion level is defined. A combination of three numerical methods is used to solve the coupled problem. The example object of the research is a beam cross-section with four reinforcement bars. The proposed methodology allows one to predict evolving chloride concentration and time to reinforcement depassivation, depending on the reinforcement position and on the location of a point on the bar surface. Moreover, the dependence of the corrosion initiation time on the chloride diffusion coefficient, chloride threshold, and reinforcement cover thickness is examined.

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An investigation on the three-dimensional transport of chloride ions in concrete based on X-ray computed tomography technology

Cited by 35 publications

References 38 publications

Evaluating the chloride permeability of steel–concrete interface based on concretes of different stability

Evaluating the chloride permeability of steel–concrete interface based on concretes of different stability

Engineering vulnerability evaluation of building structures in coastal areas considering the effects of corrosion

Numerical Simulation of Non-Uniformly Distributed Corrosion in Reinforced Concrete Cross-Section

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