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Home > Publications > International Concrete Abstracts Portal
The International Concrete Abstracts Portal is an ACI led collaboration with leading technical organizations from within the international concrete industry and offers the most comprehensive collection of published concrete abstracts.
Title: Influence of Condensed Silica Fume and Sand/Cement Ratio on Pore Structure and Frost Resistance of Portland Cement Mortars
Author(s): R. F. Feldman
Publication: Special Publication
Appears on pages(s): 973-990
Keywords: cements; freeze-thaw durability; mortars (material);
porosity; portland cements; sands; silica.
Abstract:Pore 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 l03 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 103 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 cyles. At lower sand/cement ratios 10% silica fume gives little protection.
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