Effect of ionic interaction in migration testing of chloride diffusivity in concrete

Tie-wei, Zhang; Gjørv, Odd E.

doi:10.1016/0008-8846(95)00147-5

Cited by 23 publications

(6 citation statements)

References 1 publication

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“…This is in agreement with experimental results found by Suryavanshi [37] and Tritthart [42]. Consequently, an isotherm based on the double layer (DL) theory [6,47] is defined in Eq. 7: Table 1 Equations of three classical chloride binding isotherms: the linear, the Freundlich and the Langmuir isotherms.…”

Section: Binding Descriptionsupporting

confidence: 91%

Comparison of existing chloride ingress models within concretes exposed to seawater

2016

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Numerous models to predict chloride ingress within concretes for different environmental conditions (immersed in seawater, located in the tidal zone or exposed to sea spray) have already been developed. Thanks to a benchmark, the objective of this paper is to contribute to the choice of a reliable engineering model for predicting chloride ingress in the case of saturated conditions. This study focus on a comparison between various physicochemical models which rely on different approaches to account for transport phenomena and binding of chloride ions onto the cementitious matrix. The authors draw special attention to models using a limited number of input data (3 or 4): accessible-to-water porosity (φ w ), effective chloride diffusion coefficient (D Cl − ) and one or two parameter(s) characterizing the physical binding of ions Cl − . They are determined through the analysis of two simple and repeatable experimental tests: φ w is measured directly by hydrostatic weighing and the other parameters are fitted by inverse analysis performed of a total chloride content (tcc) profile at a given exposure time. An application of the method and a comprehensive comparison between predicted chloride profiles and experimental data (tcc profiles at other ages than the one used for the fitting and free chloride concentration (fcc) profiles) have been carried out for two mortars and seven concretes exposed to laboratory or in-situ conditions. The performance of the studied models is assessed thanks to statistical tools and recommendations are pointed out for the development of new numerical models.

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Section: Binding Descriptionsupporting

confidence: 91%

Comparison of existing chloride ingress models within concretes exposed to seawater

2016

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“…the influence of chloride on RC degradation. However, these two approaches have limitations that are difficult to overcome; the accelerated experiment frequently adopts electric current to achieve acceleration, which results in inconsistency of RC degradation with real cases [15][16][17], and the real test often consumes significant amounts of time, manpower, and physical resource. To overcome these deficiencies, the accelerated simulation test [or artificial simulated environment (ASE)] with advantages of reliable results, good correlation, and obvious acceleration effect, has been improved.…”

Section: Introductionmentioning

confidence: 98%

Accelerated simulation of chloride ingress into concrete under drying–wetting alternation condition chloride environment

Chen

Liu

et al. 2015

Construction and Building Materials

115

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“…The topic of ion transport in cement-based media has been extensively explored by scientists over the last few decades, e.g., [ 19 , 20 , 21 , 22 , 23 , 24 , 25 , 26 , 27 , 28 , 29 , 30 , 31 , 32 , 33 , 34 , 35 , 36 , 37 , 38 , 39 , 40 ]. Most papers [ 19 , 20 , 23 , 24 , 27 , 32 ] consider one-dimensional models, and many models neglect the influence of ion activities on transport [ 19 , 20 , 23 , 24 , 25 , 27 , 28 , 29 , 30 , 33 ]. Many papers concentrate on chloride ions diffusion only, neglecting other ions and their interactions [ 19 , 20 , 25 , 27 , 29 , 30 ].…”

Section: Introductionmentioning

confidence: 99%

The Influence of Chemical Activity Models on the Description of Ion Transport through Micro-Structured Cementitious Materials

Szyszkiewicz-Warzecha

Wilczek-Vera

Lewenstam

et al. 2023

Materials

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The significance of ion activity in transport through a porous concrete material sample with steel rebar in its center and bathing solution is presented. For the first time, different conventions and models of ion activity are compared in their significance and influence on the ion fluxes. The study closes an interpretational gap between ion activity in a stand-alone (stagnant) electrolyte solution and ion transport (dynamic) through concrete pores. Ionic activity models developed in stationary systems, namely, the Debye–Hückel (DH), extended DH, Davies, Truesdell–Jones, and Pitzer models, were used for modeling the transport of ions driven through the activity gradient. The activities of ions are incorporated into a frame of the Nernst–Planck–Poisson (NPP) equations. Calculations were done with COMSOL software for a real concrete microstructure determined by X-ray computed tomography. The concentration profiles of four ions (Na+, Cl−, K+, OH−), the ionic strength, and the electric potential in mortar (with pores) and concrete samples (with aggregates and pores) are presented and compared. The Pitzer equation gave the most reliable results for all systems studied. The difference between the concentration profiles calculated with this equation and with the assumption of the ideality of the solution is negligible while the potential profiles are clearly distinguishable.

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Effect of ionic interaction in migration testing of chloride diffusivity in concrete

Cited by 23 publications

References 1 publication

Comparison of existing chloride ingress models within concretes exposed to seawater

Comparison of existing chloride ingress models within concretes exposed to seawater

Accelerated simulation of chloride ingress into concrete under drying–wetting alternation condition chloride environment

The Influence of Chemical Activity Models on the Description of Ion Transport through Micro-Structured Cementitious Materials

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