Prediction model of chloride diffusion in concrete considering the coupling effects of coarse aggregate and steel reinforcement exposed to marine tidal environment

Wang, Yuanzhan; Gong, Xiaolong; Wu, Linjian

doi:10.1016/j.conbuildmat.2019.04.221

Cited by 47 publications

(3 citation statements)

References 26 publications

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“…In offshore engineering structures, chloride is one of the main factors causing reinforcing bar corrosion (Arya, Vassie and Bioubakhsh, 2014;Kumar, Kumar and Kujur, 2019;Wang, Gong and Wu, 2019). Electrochemical repair is one of effective methods to remove chloride in concrete and improve the durability of offshore engineering structures (Xia et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

A numerical study of chloride migration in concrete under electrochemical repair

Chen

Zhang

Ming³

et al. 2023

Proceedings of the Institution of Civil Engineers - Structures

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Electrochemical repair (ECR) is one of the most effective methods of removing chloride from offshore engineering structures to improve their durability. The diffusion of chloride and electrochemical migration are key stages in this process. In this work, a new numerical chloride migration–diffusion model was established using the Nernst–Planck equation. The distributions of free chloride ions in concrete in the stages of free chloride diffusion and ECR were simulated and the effects of the external potential and cathode position on ECR efficiency were analysed. The results showed that ECR can effectively remove chloride ions from concrete. After 12 weeks of ECR, the chloride removal efficiency was more than 66%. With an increase in the repair time, the ECR efficiency decreased gradually. In the initial stage of ECR, the chloride concentration on the rebar surface decreased rapidly. After 4 weeks of ECR, the chloride concentration tended to stabilise. The ECR efficiency also improved with an increase in external potential increases, with the chloride concentration on the reinforcing bar surface decreasing rapidly. When cathodes are set on both sides of the concrete, the ECR time should be extended and the external potential should be increased to achieve a better repair effect.

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Section: Introductionmentioning

confidence: 99%

A numerical study of chloride migration in concrete under electrochemical repair

Chen

Zhang

Ming³

et al. 2023

Proceedings of the Institution of Civil Engineers - Structures

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“…Besides being weak to flexural or bending [13], concrete is also weak to corrosive environmental conditions, especially in Indonesia, where most of the area is seawater. The content of seawater, which consists of various types of salt [14], has corrosive properties that can diffuse and erode the concrete layer through the pores on the surface of the concrete [15], which will affect the reinforcement inside [16] and can increase the safety risk due to the decreased strength of the concrete [17][18][19][20][21]. Although propylene fiber is resistant to chemical and alkaline reactions and can reduce water absorption in concrete [22,23], research on using PP fiber as a concrete additive in corrosive environments is rarely done.…”

Section: Introductionmentioning

confidence: 99%

Evaluating Pre-Corrosion and Post-Corrosion of Oil Palm Shell Concrete with Non-Destructive Testing

Zaki

Fikri

Wibisono

et al. 2023

KEM

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Corrosion of reinforcement can decrease the quality and cause damage to reinforced concrete, so it is necessary to know the resistance of concrete, especially with oil palm shells (OPS) and mask fibers in a corrosive environment. This study aims to determine the effect of corrosion levels on OPS concrete and mask fiber using the NDT (non-destructive testing) method. Oil palm shells are a 10% replacement for coarse aggregate in the concrete mix. The mask fiber is 0.2% of the volume of the specimen, and the superplasticizer is 0.25% of the cement used as an additive in the concrete mixture. The specimen is 50 cm long, 10 cm wide, and 10 cm high. There are two types of specimens, namely pre-corrosion and post-corrosion. In pre-corrosion specimens, corrosion acceleration of the reinforcement is carried out before the concrete molding process. While the post-corrosion specimen is being prepared, corrosion acceleration is carried out after the concrete is 28 days old. Corrosion acceleration is carried out by immersing the concrete specimen in a 5% NaCl solution and using a DC power supply. After the concrete is corroded, NDT is carried out. The NDT methods used are resistivity and impact-echo as analysis and detection tools for the effect of corrosion on palm shell concrete and mask fiber. The pre-corrosion specimen got the highest resistivity value on the 0% specimen at 21.35 kΩ.cm and the lowest resistivity on the 5% specimen at 16.70 kΩ.cm. The resistivity value decreases with increasing corrosion levels. The post-corrosion concrete has the highest resistivity on the 0% specimen, with 18.56 kΩ.cm, and the lowest resistivity on the 5% specimen, with 13.88 kΩ.cm. The resistivity value decreases with increased corrosion levels. The impact-echo testing on the pre-corrosion specimen yielded a 0% specimen with a value of 14394.53 Hz and a 1% specimen of 18266.6 Hz. The frequency value decreases with increasing corrosion levels. The result of impact-echo testing on post-corrosion concrete was 14394.53 Hz for the 0% specimen and 1567.38 Hz for the 5% specimen. The frequency value decreases with increasing corrosion levels.

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“…As noted in previous studies, a large number of RC structures do not reach their predetermined design service life, but rather, fail due to insufficient durability [6][7][8][9][10][11][12][13][14][15]. The service environment of RC structures is one of the most immediate and significant factors affecting their structural durability, especially regarding long-term exposure to ocean salt environments [16][17][18][19][20][21][22][23][24][25]. The corrosion of steel caused by the intrusion of chloride ions into concrete results in concrete expansion and cracking, which are the main reasons for durability failures of RC structures [26][27][28][29][30][31][32][33][34][35].…”

Section: Introductionmentioning

confidence: 99%

A Review of Durability Issues of Reinforced Concrete Structures Due to Coastal Soda Residue Soil in China

Xiang

Jiang

et al. 2022

JMSE

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Soda residue soil (SRS) is a man-made engineering foundation soil formed by soda residue; it is mainly distributed in coastal areas in China. SRS is rich in a variety of corrosive salts, among which the concentrations of chloride ions are about 2–3 times that of seawater. These highly concentrated chloride ions migrate and diffuse in reinforced concrete (RC) structures built on coastal SRS through multiple transport mechanisms. However, current research on the durability of RC structures exposed to the coastal SRS environment has not led to the publication of any reports in the literature. SRS may be classified by analyzing the quantitative relationships among the corrosive ions it contains. In this paper, the deterioration of RC structures due to the corrosive saline-soil environment in China is discussed, and advances in RC structure durability under such circumstances are reviewed. Our findings show that a corrosive environment, especially when this is a result of coastal SRS, has a significant influence on the deterioration of RC structures, greatly threatening such buildings. A series of effective measures for enhancing the durability of RC structures in saline soil, including improvements in concrete strength, reductions in the water–binder ratio, the addition of mineral admixtures and fiber-reinforcing agents, etc., could provide a vital foundation for enhancing the durability of RC structures which are at risk due to coastal SRS. Vital issues that must be investigated regarding the durability of RC structures are proposed, including the transport mechanism and a prediction model of corrosive ions, dominated by chloride ions (Cl−), in SRS and RC structures, the deterioration mechanism of RC materials, a long-term performance deduction process of RC components, durability design theory, and effective performance enhancement measures. The findings of this paper provide some clear exploration directions for the development of basic theories regarding RC structure durability in coastal SRS environments and go some way to making up for the research gap regarding RC structure durability under corrosive soil environments.

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Prediction model of chloride diffusion in concrete considering the coupling effects of coarse aggregate and steel reinforcement exposed to marine tidal environment

Cited by 47 publications

References 26 publications

A numerical study of chloride migration in concrete under electrochemical repair

A numerical study of chloride migration in concrete under electrochemical repair

Evaluating Pre-Corrosion and Post-Corrosion of Oil Palm Shell Concrete with Non-Destructive Testing

A Review of Durability Issues of Reinforced Concrete Structures Due to Coastal Soda Residue Soil in China

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