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

Download
  1. (PDF, 676 KB)
  2. Get@NRC: A note on the occurrence of crystals of calcium hydroxide and ettringite in voids in hardened Portland cement paste (Opens in a new window)
DOIResolve DOI: http://doi.org/10.1680/macr.1965.17.50.3
AuthorSearch for: ; Search for:
TypeArticle
Journal titleMagazine of Concrete Research
ISSN0024-9831
Volume17
Issue50
Pages34; # of pages: 2
Subjectportland cement; calcium; hydroxides; crystalline state; carbonation; Concrete
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
AffiliationNRC Institute for Research in Construction; National Research Council Canada
Peer reviewedNo
IdentifierDBR-RP-264
NRC number8586
2150
NPARC number20374910
Export citationExport as RIS
Report a correctionReport a correction
Record identifier0a138690-b433-4175-9787-12941238d144
Record created2012-07-23
Record modified2016-06-10
Bookmark and share
  • Share this page with Facebook (Opens in a new window)
  • Share this page with Twitter (Opens in a new window)
  • Share this page with Google+ (Opens in a new window)
  • Share this page with Delicious (Opens in a new window)