Significance of water-solic ratio and temperature on the physico-mechanical characteristics of hydrating 4CaO.A12O3. Fe2O3

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DOIResolve DOI: http://doi.org/10.1007/BF00708268
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TypeArticle
Journal titleJournal of Materials Science
ISSN0022-2461
Volume11
IssueOctober 10
Pages18931910; # of pages: 18
Subjecthydrated cement; Concrete
AbstractTetracalcium alumino-ferrite in paste form, at water/solid ( W/S) ratios of 0.3, 0.4, 0.5 and 1.0, and in pressed form at effective water/solid ratios of 0.13 and 0.08 has been hydrated for up to 45 days at temperatures of 23 and 80 degrees C. Some prehydrated samples have also been subjected to autoclave treatment at 216 degrees C. Of all the samples studied, that hydrated at a W/S=0.13 at 80 degrees C indicated the highest ratio of cubic phase to hexagonal phase; that hydrated at a W/S=0.08 at 23 degrees C showed the lowest. Thermograms gave evidence of the formation of hexagonal phases, although X-ray diffraction patterns did not. The specific surface area values depended on the degree of hydration and the nature of the product, autoclaved samples giving the lowest values. During the four days of hydration the specimen hydrated at 80 degrees C expanded more than that hydrated at 23 degrees C, but after that time the rates of expansion were reversed; that of the sample hydrated at 80 degrees C was much lower than that of the sample hydrated at 23 degrees C. Microstructural examination of the material formed at higher temperatures and lower water/solid ratios indicated a closely welded, continuous network of cubic phase. Such a structure yields a product of higher strength than that of a loose structure formed at higher water/solid ratios. A reasonably linear relation was found between porosity and logarithm of microhardness.
Publication date
LanguageEnglish
AffiliationNRC Institute for Research in Construction; National Research Council Canada
Peer reviewedYes
IdentifierDBR-P-709
NRC number15782
3012
NPARC number20375723
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Record identifier84dddfb0-8433-4cb3-8632-c0629d77fa59
Record created2012-07-23
Record modified2016-05-09
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