Influence of condensed silica fume and sand/cement ratio on pore structure and frost resistance of portland cement mortars

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TypeArticle
Proceedings titlePublication - American Concrete Institute
ConferenceProceedings of the 2nd International Conference on Fly Ash, Silica Fume, Slag and Natural Pozzolans in Concrete: 1986, Madrid, Spain
ISSN0193-2527
VolumeN91
Issue2
Pages97389; # of pages: 885
Subjectsilicate minerals; sand; portland cement; mortar; freeze thaw cycles; cements; freeze-thaw durability; mortars (material); porosity; portland cements; sands; silica; Mortar; Concrete
AbstractPore structure changes in silica fume-portland cement blend mortars fabricated with 0, 10 and 30% silica fume at a water/ binder ratio of 0.60 and a sand/cement ratio of 2.25 have been monitored by mercury porosimetry while being cured for 1 to 180 days. The threshold value for pore intrusion increases with pore size and becomes less abrupt with silica fume addition; it is in the 0.5 to 20 x 10 3 nm region. Mortars were also made with and without 10% silica fume at a water/cement ratio of 0.60 and sand/cement ratios of 0, 1.0, 1.5, 1.8, 2.0, 2.25 and 3.0; the sand passed ASTM C109. Mercury intrusion measurements were carried out after 14 days of curing. In the presence of silica fume pore volume in the 0.5 to 20 x 10 3 nm pore diameter range increased with sand/cement ratio. Mortar prisms were subjected to freezing and thawing cycles (two cycles in 24 h) according to ASTM standard test method C 666, Procedure B. Freezing and thawing resistance was monitored by measuring changes in residual length and weight. Results indicate that if the sand/cement ratio is 2.25 or over, expansion is less than 0. 02% after 500 cycles. At lower sand/cement ratios 10% silica fume gives little protection.
Publication date
LanguageEnglish
AffiliationNRC Institute for Research in Construction; National Research Council Canada
Peer reviewedYes
IdentifierIRC-P-1397
NRC number26202
3349
NPARC number20375963
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Record identifierd54b0724-3233-49aa-ab29-e5be480512f3
Record created2012-07-23
Record modified2016-05-09
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