Evolution of microstructure and transport properties of cement pastes due to carbonation under a CO2 pressure gradient - A modeling approach

Quoc Tri Phung; Norbert Maes; Diederik Jacques; Geert De Schutter; Guang Ye

doi:10.1061/9780784479346.123

Evolution of microstructure and transport properties of cement pastes due to carbonation under a CO₂ pressure gradient - A modeling approach

Quoc Tri Phung, Norbert Maes, Diederik Jacques, Geert De Schutter, Guang Ye

R&D Disposal

Research output › peer-review

4 Scopus citations

Abstract

Most carbonation models only account for diffusion as the main transport mechanism rather than advection. Nevertheless, in the case of concrete used for underground waste disposal facilities, concrete may be subjected to a high hydrostatic pressure and the surrounding environment may contain a high dissolved CO₂ concentration. Therefore, a combination of diffusion and advection should be taken into account. This is also the case in accelerated carbonation where a high CO₂ pressure gradient is applied in which advection in the gas phase has a significant contribution to the carbonation process. This study aims at developing a model to predict the evolution of the microstructure and transport properties of cement pastes due to carbonation under accelerated conditions in which a pressure gradient of pure CO₂ is applied. The proposed model is based on a macroscopic mass balance for carbon dioxide in gaseous and aqueous phases. Besides the prediction of the changes in transport properties (diffusivity, permeability), the model also enables to predict the changes in microstructure. Data from accelerated tests were used to validate the model. Preliminary verification with experimental results shows a good agreement.

Original language	English
Title of host publication	CONCREEP 2015
Subtitle of host publication	Mechanics and Physics of Creep, Shrinkage, and Durability of Concrete and Concrete Structures - Proceedings of the 10th International Conference on Mechanics and Physics of Creep, Shrinkage, and Durability of Concrete and Concrete Structures
Editors	Johann Kollegger, Christian Hellmich, Bernhard Pichler
Publisher	American Society of Civil Engineers (ASCE)
Pages	1032-1041
Number of pages	10
ISBN (Electronic)	9780784479346
DOIs	https://doi.org/10.1061/9780784479346.123
State	Published - 2015
Event	10th International Conference on Mechanics and Physics of Creep, Shrinkage, and Durability of Concrete and Concrete Structures, CONCREEP 2015 - Vienna Duration: 21 Sep 2015 → 23 Sep 2015

Publication series

Name	CONCREEP 2015: Mechanics and Physics of Creep, Shrinkage, and Durability of Concrete and Concrete Structures - Proceedings of the 10th International Conference on Mechanics and Physics of Creep, Shrinkage, and Durability of Concrete and Concrete Structures
Publisher	American Society of Civil Engineers (ASCE)

Conference

Conference	10th International Conference on Mechanics and Physics of Creep, Shrinkage, and Durability of Concrete and Concrete Structures, CONCREEP 2015
Country/Territory	Austria
City	Vienna
Period	2015-09-21 → 2015-09-23

ASJC Scopus subject areas

Mechanics of Materials
Building and Construction

Access to Document

10.1061/9780784479346.123License: Unspecified

Cite this

Phung, Q. T., Maes, N., Jacques, D., De Schutter, G., & Ye, G. (2015). Evolution of microstructure and transport properties of cement pastes due to carbonation under a CO₂ pressure gradient - A modeling approach. In J. Kollegger, C. Hellmich, & B. Pichler (Eds.), CONCREEP 2015: Mechanics and Physics of Creep, Shrinkage, and Durability of Concrete and Concrete Structures - Proceedings of the 10th International Conference on Mechanics and Physics of Creep, Shrinkage, and Durability of Concrete and Concrete Structures (pp. 1032-1041). (CONCREEP 2015: Mechanics and Physics of Creep, Shrinkage, and Durability of Concrete and Concrete Structures - Proceedings of the 10th International Conference on Mechanics and Physics of Creep, Shrinkage, and Durability of Concrete and Concrete Structures). American Society of Civil Engineers (ASCE). https://doi.org/10.1061/9780784479346.123

Phung, Quoc Tri ; Maes, Norbert ; Jacques, Diederik et al. / Evolution of microstructure and transport properties of cement pastes due to carbonation under a CO₂ pressure gradient - A modeling approach. CONCREEP 2015: Mechanics and Physics of Creep, Shrinkage, and Durability of Concrete and Concrete Structures - Proceedings of the 10th International Conference on Mechanics and Physics of Creep, Shrinkage, and Durability of Concrete and Concrete Structures. editor / Johann Kollegger ; Christian Hellmich ; Bernhard Pichler. American Society of Civil Engineers (ASCE), 2015. pp. 1032-1041 (CONCREEP 2015: Mechanics and Physics of Creep, Shrinkage, and Durability of Concrete and Concrete Structures - Proceedings of the 10th International Conference on Mechanics and Physics of Creep, Shrinkage, and Durability of Concrete and Concrete Structures).

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title = "Evolution of microstructure and transport properties of cement pastes due to carbonation under a CO2 pressure gradient - A modeling approach",

abstract = "Most carbonation models only account for diffusion as the main transport mechanism rather than advection. Nevertheless, in the case of concrete used for underground waste disposal facilities, concrete may be subjected to a high hydrostatic pressure and the surrounding environment may contain a high dissolved CO2 concentration. Therefore, a combination of diffusion and advection should be taken into account. This is also the case in accelerated carbonation where a high CO2 pressure gradient is applied in which advection in the gas phase has a significant contribution to the carbonation process. This study aims at developing a model to predict the evolution of the microstructure and transport properties of cement pastes due to carbonation under accelerated conditions in which a pressure gradient of pure CO2 is applied. The proposed model is based on a macroscopic mass balance for carbon dioxide in gaseous and aqueous phases. Besides the prediction of the changes in transport properties (diffusivity, permeability), the model also enables to predict the changes in microstructure. Data from accelerated tests were used to validate the model. Preliminary verification with experimental results shows a good agreement.",

author = "Phung, {Quoc Tri} and Norbert Maes and Diederik Jacques and {De Schutter}, Geert and Guang Ye",

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Phung, QT , Maes, N , Jacques, D, De Schutter, G & Ye, G 2015, Evolution of microstructure and transport properties of cement pastes due to carbonation under a CO₂ pressure gradient - A modeling approach. in J Kollegger, C Hellmich & B Pichler (eds), CONCREEP 2015: Mechanics and Physics of Creep, Shrinkage, and Durability of Concrete and Concrete Structures - Proceedings of the 10th International Conference on Mechanics and Physics of Creep, Shrinkage, and Durability of Concrete and Concrete Structures. CONCREEP 2015: Mechanics and Physics of Creep, Shrinkage, and Durability of Concrete and Concrete Structures - Proceedings of the 10th International Conference on Mechanics and Physics of Creep, Shrinkage, and Durability of Concrete and Concrete Structures, American Society of Civil Engineers (ASCE), pp. 1032-1041, 10th International Conference on Mechanics and Physics of Creep, Shrinkage, and Durability of Concrete and Concrete Structures, CONCREEP 2015, Vienna, Austria, 2015-09-21. https://doi.org/10.1061/9780784479346.123

Evolution of microstructure and transport properties of cement pastes due to carbonation under a CO₂ pressure gradient - A modeling approach. / Phung, Quoc Tri ; Maes, Norbert ; Jacques, Diederik et al.
CONCREEP 2015: Mechanics and Physics of Creep, Shrinkage, and Durability of Concrete and Concrete Structures - Proceedings of the 10th International Conference on Mechanics and Physics of Creep, Shrinkage, and Durability of Concrete and Concrete Structures. ed. / Johann Kollegger; Christian Hellmich; Bernhard Pichler. American Society of Civil Engineers (ASCE), 2015. p. 1032-1041 (CONCREEP 2015: Mechanics and Physics of Creep, Shrinkage, and Durability of Concrete and Concrete Structures - Proceedings of the 10th International Conference on Mechanics and Physics of Creep, Shrinkage, and Durability of Concrete and Concrete Structures).

Research output › peer-review

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T1 - Evolution of microstructure and transport properties of cement pastes due to carbonation under a CO2 pressure gradient - A modeling approach

AU - Phung, Quoc Tri

AU - Maes, Norbert

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AU - Ye, Guang

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N2 - Most carbonation models only account for diffusion as the main transport mechanism rather than advection. Nevertheless, in the case of concrete used for underground waste disposal facilities, concrete may be subjected to a high hydrostatic pressure and the surrounding environment may contain a high dissolved CO2 concentration. Therefore, a combination of diffusion and advection should be taken into account. This is also the case in accelerated carbonation where a high CO2 pressure gradient is applied in which advection in the gas phase has a significant contribution to the carbonation process. This study aims at developing a model to predict the evolution of the microstructure and transport properties of cement pastes due to carbonation under accelerated conditions in which a pressure gradient of pure CO2 is applied. The proposed model is based on a macroscopic mass balance for carbon dioxide in gaseous and aqueous phases. Besides the prediction of the changes in transport properties (diffusivity, permeability), the model also enables to predict the changes in microstructure. Data from accelerated tests were used to validate the model. Preliminary verification with experimental results shows a good agreement.

AB - Most carbonation models only account for diffusion as the main transport mechanism rather than advection. Nevertheless, in the case of concrete used for underground waste disposal facilities, concrete may be subjected to a high hydrostatic pressure and the surrounding environment may contain a high dissolved CO2 concentration. Therefore, a combination of diffusion and advection should be taken into account. This is also the case in accelerated carbonation where a high CO2 pressure gradient is applied in which advection in the gas phase has a significant contribution to the carbonation process. This study aims at developing a model to predict the evolution of the microstructure and transport properties of cement pastes due to carbonation under accelerated conditions in which a pressure gradient of pure CO2 is applied. The proposed model is based on a macroscopic mass balance for carbon dioxide in gaseous and aqueous phases. Besides the prediction of the changes in transport properties (diffusivity, permeability), the model also enables to predict the changes in microstructure. Data from accelerated tests were used to validate the model. Preliminary verification with experimental results shows a good agreement.

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Phung QT , Maes N , Jacques D, De Schutter G, Ye G. Evolution of microstructure and transport properties of cement pastes due to carbonation under a CO₂ pressure gradient - A modeling approach. In Kollegger J, Hellmich C, Pichler B, editors, CONCREEP 2015: Mechanics and Physics of Creep, Shrinkage, and Durability of Concrete and Concrete Structures - Proceedings of the 10th International Conference on Mechanics and Physics of Creep, Shrinkage, and Durability of Concrete and Concrete Structures. American Society of Civil Engineers (ASCE). 2015. p. 1032-1041. (CONCREEP 2015: Mechanics and Physics of Creep, Shrinkage, and Durability of Concrete and Concrete Structures - Proceedings of the 10th International Conference on Mechanics and Physics of Creep, Shrinkage, and Durability of Concrete and Concrete Structures). doi: 10.1061/9780784479346.123