Studi chimico-fisici del 3CaO.Al[2]O[3], del 4CaO.Al[2]O[ 3].Fe[2]O[3] e del CaO.Al[2]O[3] idratati con bassi rapporti acqua: solido = Physico-chemical studies of 3CaO. Al[2]O[3], 4CaO.Al[2]O[3].Fe[2]O[3] and CaO.Al[2]O[3] hydrated at low water: solid ratios

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TypeArticle
Journal titleIl Cemento
ISSN0008-8900
Volume89
Pages316; # of pages: 14
SubjectConcrete
AbstractTricalcium aluminate (C3A) and tetracalcium alluminoferrite (C4AF) together, comprising 12-25% of Port/ant cement, influence its early hydration, setting and other long term characteristics [1]. Tricalcium aluminate, on hydration forms a mixture of metastable hexagonal hydration products C2AH8 and C4AH19 that convert to the stable cubic hydrate C3AH6. Similarly tetracalcium aluminoferrite forms metastable hexagonal and stable cubic hydrates in which iron substitutes for aluminum. Both C3A and C4AF pastes yield lower strengths than do the silicate phases under normal conditions of hydration. It is generally believed that C3A and C4 AF develop low strengths owing to the formation of the cubic hydrate phase. Monocalcium aluminate, CA, is the main component of the high alumina cement. The hydration products of CA consist of CAH10, C2AHs, C3AH6 and AH3 (gel or crystalline). At lower temperatures the products of CA comprise CAH10, C2AH8 and AH3 gel while at higher temperatures C3AH6 and gibbsite predominate. The« Conversion » or « Inversion » that occurs as a consequence of the transformation of the hexagonal phases CAH10 and C2AH8 into the cubic phase C3AH6 is accompanied by a loss in strength of the hardened high alumina cement.
Publication date
LanguageItalian
AffiliationNRC Institute for Research in Construction; National Research Council Canada
Peer reviewedYes
IdentifierIRC-P-1836
NRC number34053
3235
NPARC number20375760
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Record identifierbbf16868-b91f-441e-a953-5a6b21547ccb
Record created2012-07-23
Record modified2016-05-09
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