Development of a multi-species mass transport model for concrete with account to thermodynamic phase equilibriums

Hosokawa, Yoshifumi; Yamada, Kazuo; Johannesson, Björn; Nilsson, Lars-Olof

doi:10.1617/s11527-011-9720-2

Cited by 76 publications

(48 citation statements)

References 21 publications

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“…Chloride penetrates the concrete via adsorption on its surface and further transports to greater depths into the concrete by diffusion (Yu and Page 1991). A number of factors such as porosity, tortuosity, type and amount of hydrates, and characteristics of calcium silicate hydrate (C-S-H) contribute to the concentration of free chloride in the pore solution of concrete for initiating and promoting the corrosion process; these factors have been extensively studied using several different experimental techniques and modeling approaches (Samson and Marchand 2007;Johannesson et al 2007;Hosokawa et al 2011;Glasser et al 2008).…”

Section: Introductionmentioning

confidence: 99%

The Impact of Tortuosity on Chloride Ion Diffusion in Slag-Blended Cementitious Materials

Hatanaka

Elakneswaran

Kurumisawa

et al. 2017

ACT

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The purpose of this study is to determine the tortuosity of cementitious materials containing blast furnace slag (BFS). Furthermore, the influence of tortuosity on multi-species transport into these materials is studied. The porosity and diffusivity of calcium silicate hydrate (C-S-H) were predicted using a three-dimensional spatial distribution model, which were then fitted to Archie's law to determine tortuosity. The tortuosity increased with the slag replacement ratio, suggesting that the diffusion path for ions becomes complicated and lengthy due to slag addition. Thermoporometry was used to determine the pore size distribution of hydrated slag-blended cement. A partial replacement of ordinary Portland cement (OPC) with BFS modified the mineralogy (especially in the types of C-S-H), resulting in changes to the pore structure. The determined tortuosity and porosity were used in a reactive transport model to predict multi-species transport. Experimentally measured and simulated chloride profiles were in good agreement for hydrated OPC and slagblended cements exposed to sodium chloride solutions. The causes for the low penetration rate of chloride in slagblended cementitious materials are discussed considering their pore structure and surface electrical properties. The role of tortuosity on Cl -/OH -for the evaluation of chloride induced corrosion was also discussed.

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Section: Introductionmentioning

confidence: 99%

The Impact of Tortuosity on Chloride Ion Diffusion in Slag-Blended Cementitious Materials

Hatanaka

Elakneswaran

Kurumisawa

et al. 2017

ACT

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“…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%

“…Reactive transport models are an essential tool to evaluate the performance of cementitious materials because the degradation has to be predicted precisely with time at each point of the materials. In recent years, many reports have been published on multispecies transport and coupling of the transport model with chemical reactions (Elakneswaran et al 2010;Hosokawa et al 2011;Kari et al 2013;Marchand et al 2002). The STADIUM model developed by Marchand et al (2002) coupled the mass and energy transport equations with the chemical equilibrium equation at each step of the calculation.…”

Section: Introductionmentioning

confidence: 99%

“…The STADIUM model developed by Marchand et al (2002) coupled the mass and energy transport equations with the chemical equilibrium equation at each step of the calculation. Hosokawa et al (2011) proposed a model for multispecies diffusion (Nernst-Planck-Poisson) by considering the chemical reactions between cement hydrates and the pore solution (coupling phase equilibrium model in PHREEQC externally). Multispecies transport can be simulated in PHREEQC only by using the phaseequilibrium and multi-component diffusion modules (Elakneswaran et al 2010;Kari et al 2013).…”

Section: Introductionmentioning

confidence: 99%

“…On the other hand, PHREEQC can perform geochemical and speciation calculation (Appelo and Postma 2009;Parkhust and Appelo 1999). Furthermore, it can perform the same kind of calculations in cementitious materials as well (Elakneswaran et al 2010;Hosokawa et al 2011;Kari et al 2013). However, PHREEQC cannot predict the hydration or micro-pore structure formation in cementitious materials.…”

Section: Introductionmentioning

confidence: 99%

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

Elakneswaran

Ishida

2014

ACT

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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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Integrating Physicochemical and Geochemical Aspects for Development of a Multi-scale Modelling Framework to Performance Assessment of Cementitious Materials

Elakneswaran

Ishida

2013

RILEM Bookseries

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Development of a multi-species mass transport model for concrete with account to thermodynamic phase equilibriums

Cited by 76 publications

References 21 publications

The Impact of Tortuosity on Chloride Ion Diffusion in Slag-Blended Cementitious Materials

The Impact of Tortuosity on Chloride Ion Diffusion in Slag-Blended Cementitious Materials

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

Integrating Physicochemical and Geochemical Aspects for Development of a Multi-scale Modelling Framework to Performance Assessment of Cementitious Materials

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