Length changes in calcium hydroxide depleted portland cement paste = Variazioni di lunghezza delle paste di cemento portland private dell'iidrossido di calcio

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TypeArticle
Journal titleIl Cemento
ISSN0008-8900
Volume86
Issue2
Pages8796; # of pages: 10
Subjectcement paste; expansion contraction; Concrete; dilatation contraction; pâte de ciment;
AbstractIn order to understand the relative roles played by free Ca( OH)2 and CSH in carbonation shrinkage, it is essential to establish the length changes occurring both during the removal of free Ca(OH)2, CaO2 units and Ca++ ions from the hydrated portland cement and after, during drying. In this paper, portland cement paste was leached for different periods and the unleached, leached (removal of free calcium hydroxide) and overleached (removal of combined calcium hydroxide) specimens were subjected to isothermal drying and wetting and their length change behaviour was examined. Results show leaching of free Ca(OH)2 and of interlayer and structural Ca(OH)2 from hydrated portland cement give slight expansion and slight contraction respectively. Drying shrinkage which between 100 and 42% RH is moderately increased by leaching and between 11% RH and final drying is greatly increased, is largely due to removal of interlayer Ca++ ions. This removal may play a role in carbonation shrinkage.
Publication date
LanguageEnglish
AffiliationNRC Institute for Research in Construction; National Research Council Canada
Peer reviewedYes
IdentifierIRC-P-1671
NRC number32339
3108
NPARC number20375731
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Record identifiera97cf057-0f4f-46bb-a009-27c2c6513ba3
Record created2012-07-23
Record modified2016-05-09
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