Character of hydration of 3CaOAl2O3

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Journal titleJournal of the American Ceramic Society
Pages268273; # of pages: 6
Subjecthydration; cement; temperature; Concrete; hydratation; ciment; temperature
AbstractThe C[3]A compacts were hydrated and the reaction was studied by DTA, X-ray diffraction, mercury porosimetry, and volume change analysis. The hexagonal hydroaluminates C[2] AH[8] and C[4]AH[19] formed at 2, 12, and 23 degrees C by a direct mechanism between C[3]A and H[2]O. The hydration reaction at 52 and 80 degrees C was stopped by formation of C[3]AH[6] around the C[3]A grains. The rate of conversion of the hexagonal hydrates to cubic C[3]AH[6] increased with temperature. Volume change analysis confirmed that C[3]AH[ 6] grows expitaxially on the surface of the C[3]A grain. The reaction at this surface and the passage of water through the layer of hexagonal hydroaluminates control the overall reaction rate. The conversion of the hexagonal hydrates to C[3]AH[6] accelerates the reaction by removing the layer of products from around the C[3]A grain by a solution mechanism. At 52 and 80 degrees C, C[3]AH[6] may form without the intermediate formation of the hexagonal hydrate.
Publication date
AffiliationNRC Institute for Research in Construction; National Research Council Canada
Peer reviewedYes
NRC number9171
NPARC number20375128
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Record identifier4fbd44ca-ef99-4ed0-8399-3b5f9ded4ce0
Record created2012-07-23
Record modified2016-05-09
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