Surface area of cement paste conditioned at various relative humidities

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DOIResolve DOI: http://doi.org/10.1016/0008-8846(83)90127-8
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TypeArticle
Journal titleCement and Concrete Research
ISSN0008-8846
Volume13
IssueJanuary 1
Pages4960; # of pages: 12
Subjectportland cement; relative humidity; surface properties( materials); chemical properties; portland cement; aging; interparticle bonds; Concrete; ciment portland; humidite relative; propriete de surface; propriete chimique
AbstractThe N[2] BET surface area (SA) of bottle hydrated portland cement is greatly reduced if exposed to changing relative humidities. The maximum SA loss, from 83 m[2]/g, occurred on exposure to between 40 and 60% RH. In addition, the number and rate of humidity changes appear to affect the value of the SA, which increases only when exposed to relative humidities in excess of 75%. The phenomenon cannot be explained by the usual causes of aging of high specific SA solids. It is proposed that the solid, deformed by non- uniform moisture distribution during changing humidity conditions, breaks and makes interparticle bonds. A unique feature of cement paste is that these bonds can easily form and remain intact even after the moisture gradient vanishes.
Publication date
LanguageEnglish
AffiliationNRC Institute for Research in Construction; National Research Council Canada
Peer reviewedYes
IdentifierDBR-P-1065
NRC number20762
1528
NPARC number20378736
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Record identifier3a653746-dd6e-4493-b181-0c7834b120b8
Record created2012-07-24
Record modified2016-05-09
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