Diffusion of sulfate ions into cement stone regarding simultaneous chemical reactions and resulting effects

This study presents a model of sulfate ion diffusion into cement stone, in particular the simultaneous chemical reactions and resulting effects (filling of material voids with chemical products and hampering of ion motion within the specimen). The diffusion development is followed by the solution of...

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Bibliographic Details
Published in:Cement and concrete research 1999, Vol.29 (10), p.1591-1596
Main Authors: Gospodinov, Peter N., Kazandjiev, Robert F., Partalin, Todor A., Mironova, Mirona K.
Format: Article
Language:English
Subjects:
Applied sciences
Buildings. Public works
Cement
Cement concrete constituents
Cements
Diffusion
Exact sciences and technology
Hydration
Materials
Microstructure
Modeling
Properties of anhydrous and hydrated cement, test methods
Sulfate attack
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Summary:This study presents a model of sulfate ion diffusion into cement stone, in particular the simultaneous chemical reactions and resulting effects (filling of material voids with chemical products and hampering of ion motion within the specimen). The diffusion development is followed by the solution of the diffusion equation, introducing a specific relation for the diffusion coefficient and considering appropriate initial and boundary conditions. The change of the material structure is theoretically and experimentally assessed. A possibility for studying diffusion in multiply connected areas (i.e., in real materials that contain inclusions, inert filler, and reinforcement) is outlined. Good agreement between theory and experiment is obtained.
ISSN:0008-8846
1873-3948
DOI:10.1016/S0008-8846(99)00138-6