Significance of low water-solic ratio and temperature on the physico-mechanical characteristics of hydrates of tricalcium aluminate

Download
  1. (PDF, 874 KB)
  2. Get@NRC: Significance of low water-solic ratio and temperature on the physico-mechanical characteristics of hydrates of tricalcium aluminate (Opens in a new window)
AuthorSearch for: ; Search for:
TypeArticle
Journal titleJournal of Applied Chemistry and Biotechnology
ISSN0375-9210
Volume23
Pages625633; # of pages: 9
Subjectcement; hydration; physical properties; mechanical properties; Concrete
AbstractHydration characteristics are reported of tricalcium aluminate studied at 20 and 80 degrees C using water-solid ratios of 0.2 and 1.0. Hydration products were subjected to differential thermal analysis, thermogravimetric analysis, scanning electron microscopy, length change, porosity and pore size distribution, and microhardness measurements. Hydration proceeds faster at 80 degrees C than at 20 degrees C and the cubic C[3]AH[6] phase is detected in the first few seconds. At 20 degrees C hydration occurs with the initial formation of the hexagonal phases and expansion is continuous. At higher temperatures and a water-solid ratio of 0.2, after an initial small expansion, the dimensional change is low. The prouct at 80 degrees C develops more than four-fold the hardness value developed at 20 degrees C. After 2 days of hydration, porosity, per cent C[3]AH[6] and microhardness are 15.2%, 83% and 38.9 kg/mm[2]; corresponding values for the product obtained at 20 degrees C are 21.5%, 75% and 9.1 kg/mm[2]. Microstructural examination of the material formed at 80 degrees C indicates a closely welded and continuous network of the cubic phase. These results reveal that at a low water-solid ratio and higher temperatures the formation of the cubic phase from C[ 3]A results in an enhancement of strength.
Publication date
LanguageEnglish
AffiliationNRC Institute for Research in Construction; National Research Council Canada
Peer reviewedYes
IdentifierDBR-RP-589
NRC number13781
3004
NPARC number20375320
Export citationExport as RIS
Report a correctionReport a correction
Record identifierf2b6eb1d-26cf-4f8c-bfc9-a15b71167e21
Record created2012-07-23
Record modified2017-03-23
Bookmark and share
  • Share this page with Facebook (Opens in a new window)
  • Share this page with Twitter (Opens in a new window)
  • Share this page with Google+ (Opens in a new window)
  • Share this page with Delicious (Opens in a new window)