Strätlingite formation in high alumina cement-zeolite systems

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TypeArticle
Journal titleAdvances in Cement Research
Volume7
Issue28
Pages171178; # of pages: 8
SubjectAdmixtures
AbstractReaction mechanisms of strätlingite formation in high alumina cement (HAC)-zeolite systems were studied. A component separation method that made it possible to study individual reactions involving hydrated HAC and zeolite was employed. Different sodium salts, e.g. sodiumsilicate, sodium carbonate, sodium sulphate and sodium nitrate, were used to promote strätlingite formation in the HAC paste. Strätlingite forms preferentially to the cubic hydrogarnet phase in hydrated HAC systems in the presence of zeolite. A sufficiently high silicate concentration, arising from the dissolution of silicabearing materials such as zeolite, is required. A high pH environment is also conducive to strätlingite formation. The thermochemical stability of CAHlO, the normal precursor to hydrogarnet formation, is apparently increased under the condition of high microsilica content.
Publication date
LanguageEnglish
AffiliationNRC Institute for Research in Construction; National Research Council Canada
Peer reviewedYes
NRC number38798
5615
NPARC number20375692
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Record identifier9dcb153f-15fa-4310-b494-67b2281e6034
Record created2012-07-23
Record modified2016-05-09
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