Volume change, porosity and helium flow studies of hydrated portland cement

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ConferenceProceedings RILEM/IUPAC 1973 International Symposium on Pore Structure and Properties of Materials: 18 September 1973, Prague, Czechoslovakia
Subjectportland cement; hydrated cement; helium; mechanical properties; porosity; Concrete
AbstractThe mechanical properties of hydrated portland cement, are largely dependent on its pore structure. This paper describes these relationships and shows the difficulties in firmly establishing them because of (a) the instability of the material under any form of stress and drying and (b) the existence of interlayer spaces which play an important part in volume stability and elastic moduli of the material. A new technique, the helium flow method, is described, where relative changes to the dimensions of very small pores, due to removal of sorbed water may be traced. This technique involves measuring the flow of helium as a function of time into the vacated spaces of the material as water is removed and returned. Simultaneously, volume change, porosity and density of the material are measured as a function of weight change. Results obtained by this technique are presented showing the unique behaviour of this "porosity" and how density of the sorbed water can be computed. Results that show the effect of this "porosity" on Young's modulus are also presented.
Publication date
AffiliationNRC Institute for Research in Construction; National Research Council Canada
Peer reviewedYes
NRC number13729
NPARC number20375402
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Record identifierf58d2afb-07fc-4d68-a737-003c28fd975e
Record created2012-07-23
Record modified2016-05-09
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