Behaviour of crystallised phases of Portland cement upon water attack

The changes occurring in the crystallised phases during degradation of an ordinary Portland cement have been studied. Leaching of cement paste with demineralised water generates a series of dissolution boundaries. Portlandite, then AFm, ettringite and calcite dissolve successively. In the zones with...

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Bibliographic Details
Published inMaterials and Structures Vol. 30; no. 8; pp. 480 - 485
Main Authors Faucon, P, Adenot, F, Jorda, M, Cabrillac, R
Format Journal Article
LanguageEnglish
Published Dordrecht Springer Nature B.V 01.10.1997
Subjects
Atomic force microscopy
Boundaries
Building construction
Building materials
Calcite
Cement
Cements
Civil engineering
Dissolution
Phases
Portland cements
Surface layer
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Summary:The changes occurring in the crystallised phases during degradation of an ordinary Portland cement have been studied. Leaching of cement paste with demineralised water generates a series of dissolution boundaries. Portlandite, then AFm, ettringite and calcite dissolve successively. In the zones with no change in mineralogy, local chemical equilibrium and decreasing gradients in calcium and hydroxyls between the core and the surface explain the precipitation of the secondary phases, like AFm, ettingite and calcite. Hydrogarnets in the surface layer in contact with the aggressive solution only dissolved slightly, or not at all. The very low solubility of hydrotalcites at pH values near neutrality explains the preciptation of these magnesium-containing phases in the surface layer.[PUBLICATION ABSTRACT]
Bibliography:ObjectType-Article-2
SourceType-Scholarly Journals-1
ObjectType-Feature-1
content type line 23
ISSN:1359-5997
1871-6873
DOI:10.1007/BF02524776