Modeling the sulfate attack induced expansion of cementitious materials based on interface-controlled crystal growth mechanisms

Yushan Gu, Patrick Dangla, Renaud-Pierre Martin, Othman Omikrine-Metalssi, Teddy Fen-Chong

Research output: Contribution to journalArticleScientificpeer-review

1 Citation (Scopus)

Abstract

External sulfate attack (ESA) and delayed ettringite formation (DEF) are well-known concrete degradation phenomena induced by ettringite crystallization. This paper proposes a poromechanical model based on the surface-controlled ettringite growth mechanism and the chemical composition of the solution, explaining both ESA and DEF in a similar model. The driving force for this expansion is the crystallization pressure from the supersaturation of the sulfate solution that leads to the formation of ettringite in pores. The growth of ettringite is separated into two processes: (1) the pore invasion process, where ettringite forms in the existing largest pores and then penetrates progressively into the ever-smaller capillary and gel pores, and (2) the deformation process during which damage and cracks occur. Two kinetic constants corresponding to these two processes are proposed in this paper, and the predicted expansions show good consistency with the experimental measurements found in the literature.

Original languageEnglish
Article number106676
JournalCement and Concrete Research
Volume152
DOIs
Publication statusPublished - Feb 2022
MoE publication typeA1 Journal article-refereed

Keywords

  • Correns equation
  • Crystal growth
  • Delayed ettringite formation
  • External sulfate attack
  • Ostwald-Freundlich equation
  • Poromechanics

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