Thermal decomposition of nanoparticulate Ca(OH)2 - anomalous effects

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TypeArticle
Journal titleAdvances in Cement Research
Volume19
IssueJanuary 1
Pages17; # of pages: 7
SubjectCa(OH)2, thermal decomposition, crystallinity; Cement/Concrete
AbstractDifferent forms of Ca(OH)2 with varying degrees of crystallinity and surface area were prepared using Ca(OH)2 and CaCO3 as starting materials.They were decomposed and the hydrated CaO formed at different conditions. The nitrogen surface area values of Ca(OH)2 ranged from 3.7 to 31.1 m2/g. The presence of two separate and distinct thermal decomposition events (in DTG) was observed, depending on the degree of crystallinity. Endotherms occurred at temperatures of about 426 and 454°C. Binary mixtures of Ca(OH)2 with substantially different degrees of crystallinity exhibited a well defined thermal decomposition doublet. The peak height of each endotherm was dependent on the mass proportions of each mixture component. Factors, including thermodynamic considerations, affecting the character of the decomposition behavior of Ca(OH)2 are discussed.
Publication date
LanguageEnglish
AffiliationNRC Institute for Research in Construction; National Research Council Canada
Peer reviewedYes
NRC number45602
18026
NPARC number20377370
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Record identifier8944af28-79bd-40e3-a2fc-446de25b9d66
Record created2012-07-24
Record modified2016-05-09
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