Advanced search
1 file | 4.47 MB

Modelling the carbonation of cement pastes under a CO 2 pressure gradient considering both diffusive and convective transport

Author
Organization
Abstract
Underground concrete structures in radioactive waste disposal have the potential to 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 when one considers the carbonation mechanism. This study aims at developing a model to predict the evolution of the microstructure and transport properties of hardened cement pastes due to carbonation under accelerated conditions in which a pressure gradient of pure CO2 is applied. The current model is improved from the preliminary model in terms of extension to limestone cement paste and accounting for the transport of moisture. The proposed model is based on a macroscopic mass balance for CO2 and moisture in both gaseous and aqueous phases. A simplified solid -liquid equilibrium curve is used to relate the Ca content in aqueous and solid phases. Besides the prediction of the changes in porosity, diffusivity, permeability, and saturation degree, the model also enables prediction of the carbonation degree, portlandite content, and CO2 uptake. Verification with experimental results from accelerated carbonation tests shows a good agreement.
Keywords
Modelling, Carbonation, Transport properties, Microstructure, Cement paste, Limestone filler, CALCIUM-SILICATE-HYDRATE, ACCELERATED CARBONATION, PREDICTING CARBONATION, CONCRETE CARBONATION, WATER PERMEABILITY, UNSATURATED SOILS, MINERAL REACTIONS, GAS-PERMEABILITY, MICROSTRUCTURE, SIMULATION

Downloads

    • full text
    • |
    • UGent only
    • |
    • PDF
    • |
    • 4.47 MB

Citation

Please use this url to cite or link to this publication:

Chicago
Phung, Quoc Tri, Norbert Maes, Diederik Jacques, Geert De Schutter, Guang Ye, and Janez Perko. 2016. “Modelling the Carbonation of Cement Pastes Under a CO 2  Pressure Gradient Considering Both Diffusive and Convective Transport.” Construction and Building Materials 114: 333–351.
APA
Phung, Q. T., Maes, N., Jacques, D., De Schutter, G., Ye, G., & Perko, J. (2016). Modelling the carbonation of cement pastes under a CO 2  pressure gradient considering both diffusive and convective transport. CONSTRUCTION AND BUILDING MATERIALS, 114, 333–351.
Vancouver
1.
Phung QT, Maes N, Jacques D, De Schutter G, Ye G, Perko J. Modelling the carbonation of cement pastes under a CO 2  pressure gradient considering both diffusive and convective transport. CONSTRUCTION AND BUILDING MATERIALS. Elsevier BV; 2016;114:333–51.
MLA
Phung, Quoc Tri, Norbert Maes, Diederik Jacques, et al. “Modelling the Carbonation of Cement Pastes Under a CO 2  Pressure Gradient Considering Both Diffusive and Convective Transport.” CONSTRUCTION AND BUILDING MATERIALS 114 (2016): 333–351. Print.
@article{8524474,
  abstract     = {Underground concrete structures in radioactive waste disposal have the potential to 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 when one considers the carbonation mechanism. This study aims at developing a model to predict the evolution of the microstructure and transport properties of hardened cement pastes due to carbonation under accelerated conditions in which a pressure gradient of pure CO2 is applied. The current model is improved from the preliminary model in terms of extension to limestone cement paste and accounting for the transport of moisture. The proposed model is based on a macroscopic mass balance for CO2 and moisture in both gaseous and aqueous phases. A simplified solid -liquid equilibrium curve is used to relate the Ca content in aqueous and solid phases. Besides the prediction of the changes in porosity, diffusivity, permeability, and saturation degree, the model also enables prediction of the carbonation degree, portlandite content, and CO2 uptake. Verification with experimental results from accelerated carbonation tests shows a good agreement.},
  author       = {Phung, Quoc Tri and Maes, Norbert and Jacques, Diederik and De Schutter, Geert and Ye, Guang and Perko, Janez},
  issn         = {0950-0618},
  journal      = {CONSTRUCTION AND BUILDING MATERIALS},
  keyword      = {Modelling,Carbonation,Transport properties,Microstructure,Cement paste,Limestone filler,CALCIUM-SILICATE-HYDRATE,ACCELERATED CARBONATION,PREDICTING CARBONATION,CONCRETE CARBONATION,WATER PERMEABILITY,UNSATURATED SOILS,MINERAL REACTIONS,GAS-PERMEABILITY,MICROSTRUCTURE,SIMULATION},
  language     = {eng},
  pages        = {333--351},
  publisher    = {Elsevier BV},
  title        = {Modelling the carbonation of cement pastes under a CO 2  pressure gradient considering both diffusive and convective transport},
  url          = {http://dx.doi.org/10.1016/j.conbuildmat.2016.03.191},
  volume       = {114},
  year         = {2016},
}

Altmetric
View in Altmetric
Web of Science
Times cited: