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A Surface energy-based expansion mechanisms associated with delayed ettringite formation

From National Research Council Canada

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Affiliation
  1. National Research Council of Canada. NRC Institute for Research in Construction
FormatText, Article
ConferenceRILEM Workshop on Internal Sulfate Attack: 04 September 2002, Villars, Switzerland
SubjectCement/Concrete
Abstract
A surface energy-based mechanism for expansion in cement systems susceptible to Delayed Ettringite Formation (DEF) is proposed. The volume change behavior of nanoporous materials filled with impregnants and exposed to water vapor (considered analogous to the DEF situation) is described. The relevance of expansion due to Bangham swelling and dissolution phenomena is explained. The role of microcracking in expansion due to DEF is discussed. It is suggested that it is not necessary to invoke classical 'crystal growth' theory to explain expansion due to DEF. It appears that both AFt precipitation and surface effects are occurring concurrently and influencing the volume stability of the material.
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LanguageEnglish
Peer reviewedYes
NRC numberNRCC 45995
NRCC 15022
NPARC number20378972
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Record identifier75874df6-14c7-4617-87ec-9850286732f5
Record created2012-07-24
Record modified2020-03-30
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