Modeling chloride diffusion in concrete with a linear increase of surface chloride

Zhou, Shengjun

doi:10.14359/51686989

Cited by 6 publications

(5 citation statements)

References 12 publications

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“…Due to the short exposure time, the apparent surface chloride concentration showed a relatively fast growth rate. This is consistent with research findings on concrete in marine environments [33][34][35][36].…”

Section: Time-varying Chloride Transportsupporting

confidence: 92%

“…Previous studies have shown that the concentration of chloride on the surface of concrete increases rapidly in the initial phase of exposure to chloride [33]. Linear, square-root, and exponential functions are often used to represent the relationship between the increases in surface chloride concentration and exposure time [34][35][36].…”

Section: Time-varying Chloride Transportmentioning

confidence: 99%

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Chloride Transport Characteristics of Concrete Exposed to Coastal Dredger Fill Silty Soil Environment

Wu,

Jiang,

Wang

et al. 2023

Buildings

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In contrast to the marine environment, coastal regions encompass substantial saline soils characterized by complex corrosive chemical compositions. This poses notable challenges to the durability of concrete structures erected in coastal dredger fill silty soil environments. This research undertook concrete chloride corrosion assessments in both a dredger fill silty soil environment and a simulated solution environment. The findings demonstrated a progressive escalation in the free chloride concentration within concrete specimens, as the exposure duration was extended from 60 to 120 d, and discernible convection zones were observed with depths ranging from 6 to 8 mm. The investigation revealed a diminishing trend in the apparent chloride diffusion coefficient, corresponding to the elongation of exposure time and the augmentation of burial depth. Paradoxically, the burial depth and exposure duration exhibited converse effects on the apparent surface chloride concentration. Empirical formulations were derived to express the apparent surface chloride concentrations and apparent chloride diffusion coefficients as dependent on the exposure time and burial depth variables. These models exhibited an excellent goodness of fit, reaching up to 0.96. Notably, concrete specimens interred at a depth of 0.0 m displayed a favorable likeness to the simulated solution environment throughout the 60 d exposure period.

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Section: Time-varying Chloride Transportsupporting

confidence: 92%

Section: Time-varying Chloride Transportmentioning

confidence: 99%

Chloride Transport Characteristics of Concrete Exposed to Coastal Dredger Fill Silty Soil Environment

Wu,

Jiang,

Wang

et al. 2023

Buildings

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show abstract

“…x is the thickness of concrete cover in mm, and D is the diffusion coefficient in mm 2 /s; and erf() refers to the error function. Based on this, some modified models are proposed to consider depth of convection zone [36], reduction of chloride diffusivity [37], accumulation of surface chloride [38], binding effect and the influence of defects [39]. Due to the lack of verification and vagueness in parameters, some newly built models may not work and be expected, even though more factors are included.…”

Section: Models For Chloride Transportationmentioning

confidence: 99%

Service Life Prediction of Precast Concrete Structures Exposed to Chloride Environment

Zhang

Zeng

Fang³

et al. 2019

Advances in Civil Engineering

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Chloride-induced corrosion is widely accepted as one of the primary causes of premature deterioration for concrete structures in marine or deicing salt environment. For precast concrete (PC) structures, such durability problems may even be severer because defects in joint areas, e.g., cracks caused by grout shrinkage and improper construction, can accelerate chloride ion transportation process and may cause the interface shear failure when subjected to seismic load. By applying the path probability model (PPM) and reliability theory, a probabilistic framework was proposed to predict three limit states of PC structures, including corrosion initiation, serviceability limit state, and ultimate limit state. Using Monte Carlo simulation, a beam-to-column joint was further analyzed to illustrate the differences between PC structures and those cast in situ. The analysis indicates that corrosion initiation and serviceability limit state are sensitive to chloride diffusivity at connection area, and the higher pitting factor can significantly influence the bearing capacities of PC structures.

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“…These models and methods can be categorized into two types. One is to develop empirical or semi-empirical models based on the analytical solution of Fick's 2nd law [6,7], which is preferred in engineering practice owing to its simple expression and convenience to use. This approach, however, is only applicable under typical assumptions, e.g., homogeneous material, consistent environmental conditions, semi-infinite domain.…”

Section: Introductionmentioning

confidence: 99%

Effect of Seasonal Characteristics of Temperature and Relative Humidity on Chloride Diffusion Process in Concrete: A Preliminary Theoretical Study

Pan

Li²,

Ruan

2019

Sustainability

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The chloride diffusion process can be greatly affected by the temperature and relative humidity. Annual average temperature and relative humidity are often adopted in analytical models to calculate chloride profiles. These models, however, cannot consider the seasonal characteristics of temperature and relative humidity. This paper presents a theoretical study to solve the above problem. The temperature and relative humidity in several major cities in China are first collected. Then, the governing equation of one-dimensional chloride diffusion is solved by both analytical and numerical methods using the annual and monthly average temperature and relative humidity, respectively. Based on these two methods, a parameter called “seasonal correction coefficient” is introduced into the analytical models. The values of the coefficient for major cities in China are obtained. Based on the results, it is found that: (1) the analytical solution with annual average temperature and relative humidity is questionable to calculate chloride profiles for typical cities, (2) the seasonal correction coefficient is independent on the apparent chloride diffusivity, affected slightly by the activation energy of chloride ions during diffusion and greatly by the critical relative humidity for common water-to-cement ratios of ordinary Portland cement (OPC) mortar and concrete.

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Modeling chloride diffusion in concrete with a linear increase of surface chloride

Cited by 6 publications

References 12 publications

Chloride Transport Characteristics of Concrete Exposed to Coastal Dredger Fill Silty Soil Environment

Chloride Transport Characteristics of Concrete Exposed to Coastal Dredger Fill Silty Soil Environment

Service Life Prediction of Precast Concrete Structures Exposed to Chloride Environment

Effect of Seasonal Characteristics of Temperature and Relative Humidity on Chloride Diffusion Process in Concrete: A Preliminary Theoretical Study

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