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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Metalssi, Othman Omikrine
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (6/6 displayed)
- 2024Long-Term Effects of External Sulfate Attack on Low-Carbon Cementitious Materials at Early Agecitations
- 2023Chemical Mechanisms Involved in the Coupled Attack of Sulfate and Chloride Ions on Low-Carbon Cementitious Materials: An In-Depth Studycitations
- 2023Understanding the degradation mechanisms of cement-based systems in combined chloride-sulfate attackcitations
- 2022Modeling the sulfate attack induced expansion of cementitious materials based on interface-controlled crystal growth mechanismscitations
- 2020Locating ettringite due to DEF at the pore scale of cement paste by heat-based dissolution testscitations
- 2019Pore size analyses of cement paste exposed to external sulfate attack and delayed ettringite formationcitations
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article
Modeling the sulfate attack induced expansion of cementitious materials based on interface-controlled crystal growth mechanisms
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.