Hydration of 3CAOA12O3 and 3CAOA12O3 + gypsum with and without CAC12

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TypeArticle
Journal titleJournal of the American Ceramic Society
ISSN0002-7820
Volume58
Issue5-6
Pages221227; # of pages: 7
Subjecthydration; Concrete
AbstractPaste samples of tricalcium aluminate alone, with CaCl[2], with gypsum, and with gypsum and CaCl[2] were hydrated for up to 6 months and the hydration products characterized by SEM, XRD, and DTA. Tricalcium aluminate hydrated initially to a hexagonal hydroaluminate phase which then changed to the cubic form; the transformation rate depended on the size and shape of the sample and on temperature. The addition of CaCl[2] to tricalcium aluminate resulted in the formation of 3CaO.Al[2]O[3].CaCl[2].10H[2]O and 4CaO.Al[2]O[3].13H[2]O, or a solid solution of the two. The chloride retarded the formation of the cubic phase 3CaO.Al[2]O[3].6H[2]O; the addition of gypsum resulted in the formation of monosulfoaluminate with a minor amount of ettringite. When chloride was added to tricalcium aluminate and gypsum, more ettringite was formed, although 3CaO.Al[2]O[3].CaSO[4].12H[2] O and 3CaO.Al[2]O[3].CaCl[2].10H[2]O were the main hydration products.
Publication date
LanguageEnglish
AffiliationNRC Institute for Research in Construction; National Research Council Canada
Peer reviewedYes
IdentifierDBR-RP-655
NRC number14954
2777
NPARC number20373796
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Record identifier6c872d90-f601-4f46-b619-3bc0b1ebc62c
Record created2012-07-23
Record modified2016-05-09
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