DEF: As a form of sulfate attack
DOI:
https://doi.org/10.3989/mc.1996.v46.i244.519Abstract
Delayed ettringite formation (DEF) is the term used to describe expansion of some heat cured portland cement concretes. Although meaningful progress has been made, the exact mechanism of the expansion itself is not entirely understood. The ettringite reformation is enabled, primarily, by thermal decomposition of ettringite formed prior to or during the cement paste setting as a result of excessive/improper heat curing. Observance in mature concrete of crystalline ettringite in air voids, cracks, and gaps around the aggregate is not in itself an evidence for DEF, but is the consequence of natural recrystallization of ettringite into available larger spaces. Occurance of DEF is dependent on materials, curing, and environmental conditions, and can easily be distinguished from ASR and other deterioration mechanisms by optical and electron-optical methods.
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Published
1996-12-30
How to Cite
Skalny, J., Johansen, V., Thaulow, N., & Palomo, A. (1996). DEF: As a form of sulfate attack. Materiales De Construcción, 46(244), 5–29. https://doi.org/10.3989/mc.1996.v46.i244.519
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Research Articles
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Copyright (c) 1996 Consejo Superior de Investigaciones Científicas (CSIC)

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