Advanced search
1 file | 2.55 MB Add to list

Effective diffusivity of cement pastes from virtual microstructures : role of gel porosity and capillary pore percolation

Author
Organization
Abstract
The role of capillary pores percolation and gel pores are investigated to explain the underlying differences between relative diffusivity obtained from different experimental techniques using microstructures generated from two different types of hydration model viz., CEMHYD3D (a voxel based approach) and HYMOSTRUC (a vector based approach). These models provide microstructures with different capillary pore connectivity for the same degree of hydration and the same porosity due to the underlying assumptions. In order to account for a C-S-H diffusivity at the micro-scale, a continuum micro-mechanics based model has been proposed. These simulations show that deperolation of capillary pores at around 20% of capillary porosity is essential in order to correctly predict diffusivity of cement paste with water-cement ratio by mass (w/c) in between 0.4 and 0.5. Furthermore from our analysis we present a viable postulate that the higher diffusivity measured by electric resistivity compared to other methods is due to differences in contribution from gel pores. For electrical resistivity measurement it is proposed that all gel pores are diffusive whereas for ion and tracer transport it is proposed that only nitrogen accessible gel pores are diffusive. (C) 2018 Elsevier Ltd. All rights reserved.
Keywords
C-S-H, CALCIUM-SILICATE-HYDRATE, ELECTRICAL-CONDUCTIVITY, CHLORIDE, DIFFUSIVITY, TRANSPORT-PROPERTIES, COMPUTER-SIMULATION, NEUTRON-SCATTERING, WATER DIFFUSIVITY, MODEL, CONCRETE, Microstructure modelling, Diffusivity, Transport properties, Cement, paste

Downloads

  • (...).pdf
    • full text
    • |
    • UGent only
    • |
    • PDF
    • |
    • 2.55 MB

Citation

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

MLA
Patel, Ravi Ajitbhai et al. “Effective Diffusivity of Cement Pastes from Virtual Microstructures : Role of Gel Porosity and Capillary Pore Percolation.” CONSTRUCTION AND BUILDING MATERIALS 165 (2018): 833–845. Print.
APA
Patel, R. A., Perko, J., Jacques, D., De Schutter, G., Ye, G., & Van Bruegel, K. (2018). Effective diffusivity of cement pastes from virtual microstructures : role of gel porosity and capillary pore percolation. CONSTRUCTION AND BUILDING MATERIALS, 165, 833–845.
Chicago author-date
Patel, Ravi Ajitbhai, Janez Perko, Diederik Jacques, Geert De Schutter, Guang Ye, and Klaas Van Bruegel. 2018. “Effective Diffusivity of Cement Pastes from Virtual Microstructures : Role of Gel Porosity and Capillary Pore Percolation.” Construction and Building Materials 165: 833–845.
Chicago author-date (all authors)
Patel, Ravi Ajitbhai, Janez Perko, Diederik Jacques, Geert De Schutter, Guang Ye, and Klaas Van Bruegel. 2018. “Effective Diffusivity of Cement Pastes from Virtual Microstructures : Role of Gel Porosity and Capillary Pore Percolation.” Construction and Building Materials 165: 833–845.
Vancouver
1.
Patel RA, Perko J, Jacques D, De Schutter G, Ye G, Van Bruegel K. Effective diffusivity of cement pastes from virtual microstructures : role of gel porosity and capillary pore percolation. CONSTRUCTION AND BUILDING MATERIALS. Oxford: Elsevier Sci Ltd; 2018;165:833–45.
IEEE
[1]
R. A. Patel, J. Perko, D. Jacques, G. De Schutter, G. Ye, and K. Van Bruegel, “Effective diffusivity of cement pastes from virtual microstructures : role of gel porosity and capillary pore percolation,” CONSTRUCTION AND BUILDING MATERIALS, vol. 165, pp. 833–845, 2018.
@article{8603648,
  abstract     = {The role of capillary pores percolation and gel pores are investigated to explain the underlying differences between relative diffusivity obtained from different experimental techniques using microstructures generated from two different types of hydration model viz., CEMHYD3D (a voxel based approach) and HYMOSTRUC (a vector based approach). These models provide microstructures with different capillary pore connectivity for the same degree of hydration and the same porosity due to the underlying assumptions. In order to account for a C-S-H diffusivity at the micro-scale, a continuum micro-mechanics based model has been proposed. These simulations show that deperolation of capillary pores at around 20% of capillary porosity is essential in order to correctly predict diffusivity of cement paste with water-cement ratio by mass (w/c) in between 0.4 and 0.5. Furthermore from our analysis we present a viable postulate that the higher diffusivity measured by electric resistivity compared to other methods is due to differences in contribution from gel pores. For electrical resistivity measurement it is proposed that all gel pores are diffusive whereas for ion and tracer transport it is proposed that only nitrogen accessible gel pores are diffusive. (C) 2018 Elsevier Ltd. All rights reserved.},
  author       = {Patel, Ravi Ajitbhai and Perko, Janez and Jacques, Diederik and De Schutter, Geert and Ye, Guang and Van Bruegel, Klaas},
  issn         = {0950-0618},
  journal      = {CONSTRUCTION AND BUILDING MATERIALS},
  keywords     = {C-S-H,CALCIUM-SILICATE-HYDRATE,ELECTRICAL-CONDUCTIVITY,CHLORIDE,DIFFUSIVITY,TRANSPORT-PROPERTIES,COMPUTER-SIMULATION,NEUTRON-SCATTERING,WATER DIFFUSIVITY,MODEL,CONCRETE,Microstructure modelling,Diffusivity,Transport properties,Cement,paste},
  language     = {eng},
  pages        = {833--845},
  publisher    = {Elsevier Sci Ltd},
  title        = {Effective diffusivity of cement pastes from virtual microstructures : role of gel porosity and capillary pore percolation},
  url          = {http://dx.doi.org/10.1016/j.conbuildmat.2018.01.010},
  volume       = {165},
  year         = {2018},
}

Altmetric
View in Altmetric
Web of Science
Times cited: