On the mathematics of time-dependent apparent chloride diffusion coefficient in concrete

Tang, Luping; Gulikers, J.

doi:10.1016/j.cemconres.2007.01.006

Cited by 307 publications

(70 citation statements)

References 5 publications

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“…However, this analytical solution is not valid neither for curve-fitting exposure data nor for predictions because the diffusivity and the surface chloride content are both timedependent [28,29]. Since this solution is still largely used, this section compares the results obtained with the proposed numerical approach with the results coming from the analytical error-function solution.…”

Section: Comparison With the Analytical Error-function Solutionmentioning

confidence: 97%

A comprehensive probabilistic model of chloride ingress in unsaturated concrete

Bastidas‐Arteaga

Chateauneuf

Sánchez-Silva

et al. 2011

Engineering Structures

174

106

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International audienceCorrosion induced by chloride ions has become a critical issue for many reinforced concrete structures. The chloride ingress into concrete has been usually simplified as a diffusion problem where the chloride concentration throughout concrete is estimated analytically. However, this simplified approach has several limitations. For instance, it does not consider chloride ingress by convection which is essential to model chloride penetration in unsaturated conditions as spray and tidal areas. This paper presents a comprehensive model of chloride penetration where the governing equations are solved by coupling finite element and finite difference methods. The uncertainties related to the problem are also considered by using random variables to represent the model's parameters and the materials' properties, and stochastic processes to model environmental actions. Furthermore, this approach accounts for: (1) chloride binding capacity; (2) time-variant nature of temperature, humidity and surface chloride concentration; (3) concrete aging; and (4) chloride flow in unsaturated conditions. The proposed approach is illustrated by a numerical example where the factors controlling chloride ingress and the effect of weather conditions were studied. The results stress the importance of including the influence of the random nature of environmental actions, chloride binding, convection and two-dimensional chloride ingress for a comprehensive lifetime assessment

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Section: Comparison With the Analytical Error-function Solutionmentioning

confidence: 97%

A comprehensive probabilistic model of chloride ingress in unsaturated concrete

Bastidas‐Arteaga

Chateauneuf

Sánchez-Silva

et al. 2011

Engineering Structures

174

106

View full text Add to dashboard Cite

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“…Due to such variations, evaluation of penetration of chloride ion into actual concrete structure should be considered for safer structures (Yamaji 2014). Diffusion coefficient is time dependent and decreases over time (Halamickova et al 1995;Luping and Gulikers 2007;Pack et al 2010;Al-alaily and Hassan 2016). This makes it difficult to evaluate chloride ion penetration into concrete by various methods.…”

Section: Introductionmentioning

confidence: 99%

“…Hence, air permeability coefficient can be possibly used to evaluate D e . Also, assessment of chloride diffusion by electrophoretic test has its own drawbacks owing to complexity and time consumption (Truc et al 2000) and it often overestimates the diffusion value (Luping and Gulikers 2007). But a high correlation of air permeability with D e provides a scope for indirect estimation of apparent diffusion coefficient by salt immersion test (herein-after referred as ''D a '').…”

Section: Introductionmentioning

confidence: 99%

Durability Assessment of Blended Concrete by Air Permeability

Katpady

Hazehara

Soeda

et al. 2018

Int J Concr Struct Mater

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Assessment of concrete cover quality is necessary for proper maintenance of concrete structures. Concrete durability is evaluated primarily based on chloride penetrability, neutralization and other external factors. The present study attempts to analyze concrete quality and its mass transfer resistance performance by measuring the air permeability and its relation with concrete durability indicators like chloride diffusion and neutralization. The applicability of air permeability as a durability indicator is validated using concrete with different materials, parameters and curing conditions. The tests are conducted on laboratory prepared concrete as well as for concrete exposed to actual marine conditions. From the experimental results, it is found that air permeability coefficient, neutralization coefficient and chloride ion diffusion coefficient have high correlation. It is suggested that air permeability could be considered as an alternative to estimate mass transfer resistance of concrete and as a concrete durability indicator.

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“…For example, the United States [13], where / w c is the water cement ratio of concrete component. One-dimensional diffusion model with time varying diffusion coefficient and some modified model are discussed in [14][15][16][17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%