Microstructure of calcium hydroxide depleted portland cement paste 1. Density and helium flow measurements

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DOIResolve DOI: http://doi.org/10.1016/0008-8846(82)90005-9
AuthorSearch for: ; Search for:
TypeArticle
Journal titleCement and Concrete Research
ISSN0008-8846
Volume12
IssueMarch 2
Pages179189; # of pages: 11
Subjectportland cement; hydrated cement; helium; density ( physics); role of csh in cement; unleached, leached and overleached cement; interlayer water; Concrete
AbstractHydrated portland cement contains both free and combined Ca( OH)[2] together with C-S-H. Removal of the Ca(OH)[2] in controlled amounts, first by leaching with an aqueous solution of Ca(OH)[2] and then with water, allows the role of C-S-H to be studied. Helium pycnometric and inflow measurements were made on unleached, leached, and overleached material. Leaching of the free Ca(OH)[2] did not alter the C-S-H material and did not change any physical properties. Possible engulfing of C-S-H by Ca(OH)[2] is not effective in preventing helium or water flow. Overleaching to the extent that 50% of the CaO was removed from the cement broke down CaO[2] sheets, causing ready access of helium to collapsed interlayer positions. Evidence of a change in the orientation of interlayer water was observed.
Publication date
LanguageEnglish
AffiliationNRC Institute for Research in Construction; National Research Council Canada
Peer reviewedYes
IdentifierDBR-P-1033
NRC number20251
3039
NPARC number20375306
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Record identifier17483a29-274a-4307-9867-ec8b1181d5fa
Record created2012-07-23
Record modified2016-05-09
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