Modelling Chloride Diffusion in Concrete With Influence of Concrete Stress State

Wang, Jian; Ng, P.L.; Wang, Weishan; Du, Jinsheng; Song, Jian

doi:10.3846/13923730.2017.1343203

Cited by 13 publications

(3 citation statements)

References 25 publications

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“…Fick's law assumes a constant diffusion coefficient, so the diffusion coefficient of SO 4 2− must be corrected to establish the transport model of SO 4 2− transport in the concrete with accuracy. The effective diffusion coefficient of SO 4 2− in concrete can be expressed as [35]…”

Section: Concrete Porosity Correction Based On Damage Degreementioning

confidence: 99%

Numerical Simulation of Concrete Attacked by Sulfate under Drying–Wetting Cycles Coupled with Alternating Loads

Guan

Zhang

Wang³

et al. 2022

Buildings

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Concrete structures such as rigid pavements, tunnels, and runways at airports are usually subject to fatigue traffic loading during their service life. Research on the aftereffects of drying–wetting cycles coupled with alternating loads on concrete erosion in saline–alkali and coastal areas is of considerable practical importance. For this study, we utilized specimens of dimensions 100 mm × 100 mm × 400 mm with strength ratios of C30, C40, and C50. We incubated the concrete samples in a 24 h/24 h drying–wetting cycle with sodium sulfate solutions of different concentrations as we applied alternating loads. We conducted ultrasonic wave velocity tests every 30 days from the 60th day of the experiment to determine the change in the sound velocity of the concrete over the course of 360 days. In addition, we examined the invasion depth of SO42− with time. Based on the change in sound velocity, we developed the damage degree function, and we modified the diffusion coefficient of SO42− in concrete in accordance with the coupling of drying–wetting cycles and alternating loads. We conducted a simulation on SO42− penetration depth, and the results were in reasonable agreement with those obtained by experimental testing.

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Section: Concrete Porosity Correction Based On Damage Degreementioning

confidence: 99%

Numerical Simulation of Concrete Attacked by Sulfate under Drying–Wetting Cycles Coupled with Alternating Loads

Guan

Zhang

Wang³

et al. 2022

Buildings

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“…-wet-dry cycles [1] [32] -the stress influence coefficient [38]; -water saturation degrees: 50%, 75%, 90% and 100%. [26] -service life prediction [30] [31]…”

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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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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“…Since the 1990s, one of the main causes to be detected to affect reinforced concrete structures (RCS) durability is rebar corrosion [10][11][12][13][14]. This means that the end of the lifespan 2 of 19 of many civil infrastructures is prematurely reached [15,16].…”

Section: Introductionmentioning

confidence: 99%

Corrosion Assessment in Reinforced Concrete Structures by Means of Embedded Sensors and Multivariate Analysis—Part 1: Laboratory Validation

Ramón-Zamora,

Lliso-Ferrando,

Martínez-Ibernón

et al. 2023

Sensors

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Reinforced Concrete Structures (RCS) are a fundamental part of a country’s civil infrastructure. However, RCSs are often affected by rebar corrosion, which poses a major problem because it reduces their service life. The traditionally used inspection and management methods applied to RCSs are poorly operative. Structural Health Monitoring and Management (SHMM) by means of embedded sensors to analyse corrosion in RCSs is an emerging alternative, but one that still involves different challenges. Examples of SHMM include INESSCOM (Integrated Sensor Network for Smart Corrosion Monitoring), a tool that has already been implemented in different real-life cases. Nevertheless, work continues to upgrade it. To do so, the authors of this work consider implementing a new measurement procedure to identify the triggering agent of the corrosion process by analysing the double-layer capacitance of the sensors’ responses. This study was carried out on reinforced concrete specimens exposed for 18 months to different atmospheres. The results demonstrate the proposed measurement protocol and the multivariate analysis can differentiate the factor that triggers corrosion (chlorides or carbonation), even when the corrosion kinetics are similar. Data were validated by principal component analysis (PCA) and by the visual inspection of samples and rebars at the end of the study.

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Modelling Chloride Diffusion in Concrete With Influence of Concrete Stress State

Cited by 13 publications

References 25 publications

Numerical Simulation of Concrete Attacked by Sulfate under Drying–Wetting Cycles Coupled with Alternating Loads

Numerical Simulation of Concrete Attacked by Sulfate under Drying–Wetting Cycles Coupled with Alternating Loads

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

Corrosion Assessment in Reinforced Concrete Structures by Means of Embedded Sensors and Multivariate Analysis—Part 1: Laboratory Validation

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