Materials and Structures

, Volume 44, Issue 9, pp 1577–1592

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

  • Yoshifumi Hosokawa
  • Kazuo Yamada
  • Björn Johannesson
  • Lars-Olof Nilsson
Original Article

DOI: 10.1617/s11527-011-9720-2

Cite this article as:
Hosokawa, Y., Yamada, K., Johannesson, B. et al. Mater Struct (2011) 44: 1577. doi:10.1617/s11527-011-9720-2

Abstract

In this study, a coupled multi-species transport and chemical equilibrium model has been established. The model is capable of predicting time dependent variation of pore solution and solid-phase composition in concrete. Multi-species transport approaches, based on the Poisson–Nernst–Planck (PNP) theory alone, not involving chemical processes, have no real practical interest since the chemical action is very dominant for cement based materials. Coupled mass transport and chemical equilibrium models can be used to calculate the variation in pore solution and solid-phase composition when using different types of cements. For example, the physicochemical evaluation of steel corrosion initiation can be studied by calculating the molar ratio of chloride ion to hydroxide ion in the pore solution. The model can, further, for example, calculate changes of solid-phase composition caused by the penetration of seawater into the concrete cover. The mass transport part of the model is solved using a non-linear finite element approach adopting a modified Newton–Raphson technique for minimizing the residual error at each time step of the calculation. The chemical equilibrium part of the problem is solved by using the PHREEQC program. The coupling between the transport part and chemical part of the problem is tackled by using a sequential operator splitting technique and the calculation results are verified by comparing the elemental spacial distribution in concrete measured by the electron probe microanalysis (EPMA).

Keywords

Mass transportMulti-speciesThermodynamic phase equilibriumPHREEQC[Cl]/[OH]

Copyright information

© RILEM 2011

Authors and Affiliations

  • Yoshifumi Hosokawa
    • 1
  • Kazuo Yamada
    • 1
    • 2
  • Björn Johannesson
    • 3
  • Lars-Olof Nilsson
    • 4
  1. 1.R & D CenterTaiheiyo Cement CorporationSakurashiJapan
  2. 2.Taiheiyo Consultant Co. Ltd.SakurashiJapan
  3. 3.Department of Civil EngineeringTechnical University of DenmarkLyngbyDenmark
  4. 4.Division of Building MaterialsUniversity of LundLundSweden