A note on the occurrence of crystals of calcium hydroxide and ettringite in voids in hardened Portland cement paste

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DOIResolve DOI: http://doi.org/10.1680/macr.1965.17.50.3
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TypeArticle
Journal titleMagazine of Concrete Research
ISSN0024-9831
Volume17
Issue50
Pages34; # of pages: 2
Subjectportland cement; calcium; hydroxides; crystalline state; carbonation; Concrete; ciment portland; calcium; oxyde basique; etat cristallin; carbonatation
AbstractThe occurrence of crystals of calcium hydroxide and ettringite (calcium sulphoaluminate) in hardened Portland cement, reported previously by others, is confirmed. Samples of hardened Portland cement paste prepared half a century ago at one of Canada's earliest cement plants were, on examination, found to contain voids in which well developed crystals had formed. The crystals occurred as thin plates and needles that were identified by optical microscopy and X-ray diffraction as calcium hydroxide and ettringite, respectively. It is of interest that the calcium hydroxide had not been altered to carbonate even though the cement samples had been stored for a long time under conditions that would be expected to promote this change.
Publication date
LanguageEnglish
AffiliationNational Research Council Canada
Peer reviewedNo
IdentifierDBR-RP-264
NRC numberNRCC 8586
NRC-IRC-2150
NPARC number20374910
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Record identifier0a138690-b433-4175-9787-12941238d144
Record created2012-07-23
Record modified2017-06-29
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