Properties of portland cement-silica fume pastes: II. Mechanical properties

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Journal titleCement and Concrete Research
IssueNovember 6
Pages94352; # of pages: 892
Subjectsilica gel; portland cement; elastic modulus; compressive strength; hardness; mechanical properties; compressive strength; young's modulus; microhardness; porosity; various silica fume contents; elasticity; composites; log mechanical property; non-evaporable water content; Concrete; gel de silice; ciment portland; module de young; ré sistance à la compression; dureté; proprieté mécanique
AbstractCompressive strength, Young's modulus, and microhardness are measured as a function of porosity for pastes of silica fume- cement blends made with silica fume contents of 0, 10 and 30 per cent at w/(c+sf) ratios of 0.25 and 0.45. Porosities are lower for pastes without silica fume addition, but strengths are greater at w/(c+sf) of 0.25 at 180 days curing. At a w/(c+sf) of 0.45, however, strengths are marginally greater with large additions of silica fume. Modulus of elasticity is greater without addition. It is shown that silica fume addition at a w/c+sf) of 0.45 results in a relatively low E 0 but high S 0. This is due to a combination of low-density dispersed hydate of low Ca0/Si02 and low Ca(OH)2 content, leading to a relatively homogeneous composite. Correlations between log mechanical property and non-evaporable water content are good for all specimens, with and without silica fume.
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AffiliationNRC Institute for Research in Construction; National Research Council Canada
Peer reviewedYes
NRC number25342
NPARC number20375090
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Record identifier155700f1-7e08-400f-980f-e1ba7f21dac5
Record created2012-07-23
Record modified2016-05-09
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