The microstructural and hardening behaviour of tricalcium silicate pastes in the presence of calcium chloride

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TypeArticle
Journal titleJournal of Applied Chemistry and Biotechnology
ISSN0375-9210
Volume24
Issue3
Pages157170; # of pages: 14
Subjectcalcium chloride; portland cement; hydration; mechanical properties; hardening; physical properties; Admixtures
AbstractA sequential examination of strength development in terms of microhardness was studied during paste hydration of C[3]S in the presence of 2 and 5% CaCl[2] and at w/s ratios of 0.3 or 0.5. An attempt has been made to relate strength with microstructural features studied by means of Scanning Electron Microscopy. Generally, at earlier periods it was found that the 2% addition of CaCl[2] gave the strongest material; the effect was most pronounced in the 6-month sample of the series with 0.3 w/s. The high strength for the sample prepared at a w/s ratio of 0.3 may be related to a high CaO/SiO[2] C-S-H phase, low porosity, and possibly a hydrated calcium hydroxy chloride complex. The pore size distribution was also measured. In general, the higher the porosity the lower the strengths but the relationship was not perfectly linear even on the semi-logarithmic plot.
Publication date
LanguageEnglish
AffiliationNRC Institute for Research in Construction; National Research Council Canada
Peer reviewedYes
IdentifierDBR-RP-616
NRC number14229
3006
NPARC number20375627
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Record identifier0b8750c8-8911-4f2e-b33a-35004abc5527
Record created2012-07-23
Record modified2016-05-09
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