Modeling of chloride diffusivity coupled with non-linear binding capacity in sound and cracked concrete

Ishida, Tetsuya; Iqbal, Prince O'Neill; Anh, Ho Thi Lan

doi:10.1016/j.cemconres.2009.07.014

Cited by 157 publications

(45 citation statements)

References 5 publications

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“…In order to reveal the nature of stress on chloride diffusion, Soroushian and Elzafraney (2004) investigated the damage effects on concrete microstructure alteration and justified the trends in microcrack growth. Ishida et al (2009) modified the chloride diffusivity of damaged concrete by considering tortuosity and constrictivity as the reduction factors in terms of pore structure. Gerard et al (1998) and Xiang and Zhao (2007) respectively introduced a damage parameter to modify the chloride diffusivity and established a chloride diffusion model for stressed concrete.…”

Section: Introductionmentioning

confidence: 99%

Theoretical and Experimental Investigation of Loading Effects on Chloride Diffusion in Saturated Concrete

Jin

et al. 2015

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In this paper, a comprehensive investigation regarding the loading effects on chloride diffusion in saturated concrete is reported. It involves both theoretical and experimental aspects, towards contributing to the service-life prediction of infrastructure under chloride attack. A revised chloride diffusion model is proposed based on the modified Fick's second law with an emphasis on the loading effects. In particular, this influence is quantified using a newly-introduced damage effect factor defined by tortuosity and constrictivity of damaged concrete. This model is capable of predicting the chloride profiles in concrete under different loading states, regardless of whether it is damaged or undamaged. Meanwhile, a series of experimental studies were extensively operated in order to analyze the influence of loading on chloride diffusion process. Two types of mixtures (i.e. ordinary concrete and ordinary concrete mixed with slag) were investigated for chloride diffusion tests under different natures (i.e. compressive and tensile loads) and magnitudes of loads. Totally four levels of loads were applied to further correlate the relation between chloride diffusivities and associated strain values. Finally, two groups of test data with different tensile strain were adopted to validate the theoretical model. It shows that the model is reasonable and the numerical result is adequately accurate.

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Section: Introductionmentioning

confidence: 99%

Theoretical and Experimental Investigation of Loading Effects on Chloride Diffusion in Saturated Concrete

Jin

et al. 2015

ACT

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“…The diffusion coefficient of an ion, D i , in free water is expressed by (Maekawa et al 2009;Ishida et al 2009…”

Section: Transport Of Multispeciesmentioning

confidence: 99%

“…Several numerical models have been developed in the past to predict the long-term performance of cementitious materials in aggressive environments (Elakneswaran et al 2010;Hosokawa et al 2011;Ishida et al 2009;Maekawa et al 2009;Marchand et al 2002). These models are improving with understanding the deterioration phenomena through different aspects of the mechanisms and coupling between them.…”

Section: Introductionmentioning

confidence: 99%

Development and Verification of an Integrated Physicochemical and Geochemical Modelling Framework for Performance Assessment of Cement-Based Materials

Elakneswaran

Ishida

2014

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In this study, a multi-scale model called DuCOM (Durability COncrete Model), which is developed by the Concrete Laboratory at the University of Tokyo, is extended by coupling the geochemical code PHREEQC. The coupled numerical framework can address physicochemical and geochemical processes such as the hydration of cement particles, pore structure formation, multispecies transport, activity effect, thermodynamic reaction between aqueous solution and solids, etc. in cementitious materials, and therefore, it can potentially be used to assess the long-term durability of concrete structures. The model prediction for the composition of cement hydrates, pore solution chemistry, calcium profiles for the cement paste exposed in pure water, and calcium and sulphur profiles for the cement paste immersed in the sodium sulphate solution are qualitatively and quantitatively compared with experimental results obtained from literature. Finally, the importance of the strong coupling among various processes and mechanisms in the DuCOM-PHREEQC system is discussed.

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“…Some experimental results found that there was a liner relationship between bound chlorides and free chloride (Ishida, Iqbal, & Anh, 2009;Mohammed & Hamada, 2003), which can be expressed with C b =R·C f . Here, R is a parameter and can be obtained from experiments.…”

Section: Modeling Of Chloride Transport In Sound Concrete With Dryingmentioning

confidence: 99%

Effect of Transverse Crack on Chloride Penetration into Concrete Subjected to Drying–Wetting Cycles

Lu¹,

Gao²,

Liu³

2014

Proceedings of the 4th International Conference on the Durability of Concrete Structures

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In this paper, several transversely cracked RC beams, self-anchored in a three-point bending mode, were prepared and subjected to NaCl solution drying-wetting cycles. Based on two experimental results obtained after 15 and 30 cycles, respectively, the profiles of free chloride concentration at different sections of sound and cracked concretes were presented and analyzed. The depth of surface convection zone in cracked concretes subject to chloride drying-wetting cycles is about 10-20 mm, which may increase gradually with the increasing of crack width. Then, it can be found that the speed of chloride penetration in concrete will be increased by cracks. Based on the equivalent diffusion model proposed in this paper, the apparent chloride diffusion coefficients for all sound and cracked sections were calculated. It can be found from the fitting precision that the equivalent diffusion model is suitable for analyzing the chloride penetration in flexural cracked concrete when its surface crack width is less than 0.3 mm. Furthermore, the relationship between crack width and equivalent diffusion coefficient can be described with quadratic function of crack effect.

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Modeling of chloride diffusivity coupled with non-linear binding capacity in sound and cracked concrete

Cited by 157 publications

References 5 publications

Theoretical and Experimental Investigation of Loading Effects on Chloride Diffusion in Saturated Concrete

Theoretical and Experimental Investigation of Loading Effects on Chloride Diffusion in Saturated Concrete

Development and Verification of an Integrated Physicochemical and Geochemical Modelling Framework for Performance Assessment of Cement-Based Materials

Effect of Transverse Crack on Chloride Penetration into Concrete Subjected to Drying–Wetting Cycles

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