Physico-mechanical characteristics of hydrating tetracalcium aluminoferrite system at low water solid ratios

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TypeArticle
Journal titleJournal of Chemical Technology and Biotechnology. Chemical Technology
ISSN0264-3413
Volume34A
Issue4
Pages154160; # of pages: 7
Subjectcement; hydration; ferromagnetic properties; gypsum; gypsum; hydration; low sulphoaluminate; ettringite; low water - solid ratios; 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 (formed at pressures of 140 and 690 MPa to obtain an effective water:solid ratio of 0.08 and 0.13, respectively) 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 7 days were identified and estimated. The sequence of hydrate formation and the accompanying length changes were also determined. The formation of hexagonal hydrate, cubic hydrate, ettringite, low sulphoaluminate series and their interconversions was primarily dependent on gypsum content, temperature, and initial water:solid (w/s) ratio. The study indicates 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 at 80 degrees C. The microhardness and porosity characteristics of the hydrated products were compared after 2 days of hydration. The relative contribution of low sulphoaluminate, ettringite, and other hydrated phases on strength development were assessed.
Publication date
LanguageEnglish
AffiliationNRC Institute for Research in Construction; National Research Council Canada
Peer reviewedYes
IdentifierDBR-P-1219
NRC number23587
3044
NPARC number20375442
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Record identifier6ed39401-dc97-4920-9699-7fffb361bc83
Record created2012-07-23
Record modified2016-05-09
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