Investigation of endothermal doublets occurring in the thermal decomposition of Ca(OH)2

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TypeArticle
Journal titleL'industria Italiana del Cemento
Volume76
Issue823
Pages772779; # of pages: 8
SubjectConcrete
AbstractThe presence of at least two different forms of Ca(OH)2 is confirmed by the results of a thermoanalytical study on the decomposition and re-hydration characteristics of Ca(OH)2. The study comprised a series of differential scanning calorimetry (DSC) experiments (at temperatures up to 700°C) performed in an atmosphere of a continuous flow of nitrogen pre-conditioned to various relative humidities ranging from 12 to 100%. The emergence of two separate and distinct decomposition endotherms occurred. The endothermic peak temperatures were dependent on the relative humidity and temperature history of the Ca(OH)2 samples. Exposure of CaO to higher temperatures and different humidities would appear to promote the formation of both crystalline and microcrystalline products. Under these conditions, higher temperatures give rise to formation of very crystalline products and after some time, vapor phase exposure promotes the formation of microcrystalline products. Factors affecting the formation of the different forms of Ca(OH)2 are described.
Publication date
LanguageEnglish
AffiliationNRC Institute for Research in Construction; National Research Council Canada
Peer reviewedYes
NRC number49213
18270
NPARC number20377240
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Record identifier95870aee-213d-4567-af10-d1db958e68e9
Record created2012-07-24
Record modified2016-05-09
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