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A Model of the Attack of Pure Water or Undersaturated Lime Solutions on Cement / M. Buil, E. Revertegat, J. Oliver

Conference Author:
Stabilization and Solidification of Hazardous, Radioactive, and Mixed Wastes: 2nd Volume (2nd : 1990 : Williamsburg, Virginia)
Physical Description:
1 online resource (15 pages) : illustrations, figures, tables
Additional Creators:
Buil, M., Oliver, J., Revertegat, E., American Society for Testing and Materials, and ASTM International
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Summary:
A simplified model of cement attack by pure water or undersaturated lime solutions is proposed for long-term predictions of concrete degradation. The degradation is modeled by ionic diffusion in the cement pores coupled with mass exchange between the solid and aqueous phases. The local equilibrium hypothesis is discussed and justified for the present application. The only solid phases taken into account are portlandite [Ca(OH)2] and calcium-silicate-hydrate (C-S-H). The model predicts the existence of an undamaged core separated from the free surface being attacked by a sharp portlandite dissolution front with a progressive C-S-H decalcification zone located between this front and the surface. Good agreement has been found between the model and experimental results for the degradation of thin portland cement discs kept for three years in an undersaturated lime solution (1.6 mM/L). The model is completely determined with a few parameters measurable by simple tests (porosity, calcium and portlandite contents, diffusion coefficient). The model predicts a ?t kinetics for the cement degradation (as long as an undamaged core remains)
Dates of Publication and/or Sequential Designation:
Volume 1992, Issue 1123 (January 1992)
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ISBN:
9780803151864 (e-ISBN)
9780803114432
0803114435
Digital File Characteristics:
text file PDF
Bibliography Note:
Includes bibliographical references 13.
Other Forms:
Also available online via the World Wide Web. Tables of contents and abstracts freely available; full-text articles available by subscription.
Full text article also available for purchase.
Also available in PDF edition.
Reproduction Note:
Electronic reproduction. W. Conshohocken, Pa. : ASTM International, 1992. Mode of access: World Wide Web. System requirements: Web browser. Access may be restricted to users at subscribing institutions.
Technical Details:
Mode of access: World Wide Web.
Source of Acquisition:
ASTM International PDF Purchase price USD25.
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