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Title: Modeling of the link between microstructure and effective diffusivity of cement pastes using a simplified composite model

Abstract

The knowledge of the relationship between porosity and transport properties of concrete is a point of major importance to run properly the models coupling chemistry, transport and mechanics in order to simulate the engineered barrier degradations in the context of the nuclear waste deep repository. The present work proposes a simplified composite model aiming at linking microstructure and effective diffusivity of cement pastes. The proposed analytical method allows the estimation of the evolution of effective diffusivity of such materials submitted to porosity opening or plugging, at the scale of the Representative Elementary Volume (REV). The method is then applied to Ordinary Portland Cement (OPC) pastes. The porosity-diffusion evolutions determined from the composite model for various OPC pastes are implemented into simplified chemo-transport simulations aiming at describing the leaching of cementitious materials. Using these evolutions, OPC paste leaching simulations are in good agreement with the available experimental data, indicating a good reliability of the simplified composite model.

Authors:
 [1];  [2]
  1. CEA Saclay, DEN/DPC/SCCME/LECBA, 91191 Gif-sur-Yvette (France). E-mail: syriac.bejaoui@cea.fr
  2. CEA Saclay, DEN/DPC/SCCME/LECBA, 91191 Gif-sur-Yvette (France)
Publication Date:
OSTI Identifier:
20995374
Resource Type:
Journal Article
Resource Relation:
Journal Name: Cement and Concrete Research; Journal Volume: 37; Journal Issue: 3; Conference: International Conference on cementitious materials as model porous media: Nanostructure and transport processes, Centro Monte Verita (Switzerland), 17-22 Jul 2005; Other Information: DOI: 10.1016/j.cemconres.2006.06.004; PII: S0008-8846(06)00170-0; Copyright (c) 2006 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; COMPOSITE MODELS; CONCRETES; DIFFUSION; ENVIRONMENTAL TRANSPORT; LEACHING; MICROSTRUCTURE; POROSITY; PORTLAND CEMENT; RADIOACTIVE WASTE FACILITIES; RADIOACTIVE WASTES; SIMULATION

Citation Formats

Bejaoui, S., and Bary, B.. Modeling of the link between microstructure and effective diffusivity of cement pastes using a simplified composite model. United States: N. p., 2007. Web. doi:10.1016/j.cemconres.2006.06.004.
Bejaoui, S., & Bary, B.. Modeling of the link between microstructure and effective diffusivity of cement pastes using a simplified composite model. United States. doi:10.1016/j.cemconres.2006.06.004.
Bejaoui, S., and Bary, B.. Thu . "Modeling of the link between microstructure and effective diffusivity of cement pastes using a simplified composite model". United States. doi:10.1016/j.cemconres.2006.06.004.
@article{osti_20995374,
title = {Modeling of the link between microstructure and effective diffusivity of cement pastes using a simplified composite model},
author = {Bejaoui, S. and Bary, B.},
abstractNote = {The knowledge of the relationship between porosity and transport properties of concrete is a point of major importance to run properly the models coupling chemistry, transport and mechanics in order to simulate the engineered barrier degradations in the context of the nuclear waste deep repository. The present work proposes a simplified composite model aiming at linking microstructure and effective diffusivity of cement pastes. The proposed analytical method allows the estimation of the evolution of effective diffusivity of such materials submitted to porosity opening or plugging, at the scale of the Representative Elementary Volume (REV). The method is then applied to Ordinary Portland Cement (OPC) pastes. The porosity-diffusion evolutions determined from the composite model for various OPC pastes are implemented into simplified chemo-transport simulations aiming at describing the leaching of cementitious materials. Using these evolutions, OPC paste leaching simulations are in good agreement with the available experimental data, indicating a good reliability of the simplified composite model.},
doi = {10.1016/j.cemconres.2006.06.004},
journal = {Cement and Concrete Research},
number = 3,
volume = 37,
place = {United States},
year = {Thu Mar 15 00:00:00 EDT 2007},
month = {Thu Mar 15 00:00:00 EDT 2007}
}