Detection of nanostructural anomalies in hydrated cement systems

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Journal titleCement and Concrete Composites
IssueFebruary 2
Pages6369; # of pages: 7
Subjectcement systems, nanostructure, anomalies, helium in flow; Cement/Concrete
AbstractMonitoring the flow of helium gas into the structure of hydrated cement systems has proven to be a useful method for following nanostructural changes in the C-S-H phase of hydrated cement systems. The method is sensitive to changes that occur on removal of structural water from the layered silicates. The helium inflow method was applied, in this study, to normally hydrated low-water-cement ratio (w/c) Portland cement pastes (w/c< 0.35) and to low w/c autoclaved cement systems containing fly ash and elemental sulfur. Nanostructural differences for the low w/c preparations were observed consistent with published structural models of layered C-S-H. Arguments for the existence of ?trapped' space between aggregates of C-S-H layers are advanced. Evidence for the preservation of C-S-H structures (similar to those formed during normal hydration) for the autoclaved systems containing fly ash and sulfur is presented. The evidence is compatible with the existence of ?trapped' space within layered agglomerates and the collapse of C-S-H structure on removal of water, typical of normally hydrated pastes.
Publication date
AffiliationNRC Institute for Research in Construction; National Research Council Canada
Peer reviewedYes
NRC number46661
NPARC number20378286
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Record identifier70b71f45-8065-4f64-af58-d5f26f510a15
Record created2012-07-24
Record modified2016-05-09
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