Hydration of C4AF + gypsum : study of various factors

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ConferenceProceedings of the 7th International Congress on the Chemistry of Cement: 1980, Paris, France
Subjectgypsum; hydration; ferrite; portland cement; Concrete
AbstractTetracalcium aluminoferrite (C[4]AF) mixed with gypsum in amounts of 0, 5, 10, 20, and 30% was hydrated at 25 or 80 degrees C either as discs (pre-compacted at pressures of 140 and 690 MPa) or in powder form at water/cement ratios of 0.5 and 1.0. Hydration products formed at periods ranging from a few minutes to seven days were identified and estimated by the Differential Thermal Technique. The sequence of formation of hydrates - viz, hexagonal hydrate, cubic hydrate, ettringite, low sulphoaliminate and solid solution - and their interconversions were primarily dependent on gypsum content, temperature and initial water/ solid ratio. The study indicated that ettringite need not necessarily be a precursor of the formation of low sulphoaluminate hydrate when hydration is carried out at a very low w/s ratio and 80 degrees C.
Publication date
AffiliationNRC Institute for Research in Construction; National Research Council Canada
Peer reviewedYes
NRC number19448
NPARC number20375364
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Record identifier1bdcea94-f308-4a7a-8f57-307ef50a275a
Record created2012-07-23
Record modified2016-05-09
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