| Download | - View final version: Microstructural properties of blended cement mortars and their relation to durability (PDF, 817 KiB)
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| Author | Search for: Feldman, R. F.1; Search for: Cheng-Yi, H. |
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| Affiliation | - National Research Council of Canada
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| Format | Text, Article |
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| Conference | RILEM Seminar on the Durability of Concrete Structures under Normal Outdoor Exposure, March 1984, Hannover, Germany |
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| Subject | Mortar; Concrete; cement mortar; durability; physical properties; concrete admixtures |
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| Abstract | A finely divided silica by-product of the ferro-silicon industry, condensed silica fume, has been found to react relatively rapidly with hydrating cement to produce a dense impermeable body. Mortars with a sand-binder (cement and silica fume) ratio of 2.25 were made by replacing 0, 10 and 30% cement with silica fume at w/c + sf of 0.45 and 0.60. Compressive strength, pore size distribution, porosity, calcium hydroxide content, and degree of hydration were measured as a function of time (up to 180 days). Durability of mortars was assessed by (a) measuring the resistance of non air-entrained mortars, cured for 28 days, to freezing and thawing cycles, and (b) exposing specimens to a concentrated solution of salts containing chlorides. Significant change occurred in the pore structure of the blends after about 7 days; it was relatively discontinuous. Improvement in resistance to frost action resulted for specimens cured for 28 days and prepared at a w/c + sf of 0. 60, with 10 and 30% silica fume replacement. Resistance to the salt solution improved greatly after 7 days for specimens made at w/c + sf of 0.45 and containing 30% silica fume. After 28 days specimens containing 10% silica fume prepared at w/c + sf of 0.45 were also resistant to attack by salt solutions. |
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| Publication date | 1984 |
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| Publisher | Institut fur Baustoffkunde und Materialprufung der Universitat Hannover |
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| Place | Nienburger Strasse 3, D-3000 Hannover 1, Germany |
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| Language | English |
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| Peer reviewed | Yes |
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| Identifier | DBR-P-1319 |
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| NRC number | NRCC 24949
NRC-IRC-3345 |
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| NPARC number | 20375974 |
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| Export citation | Export as RIS |
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| Report a correction | Report a correction (opens in a new tab) |
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| Record identifier | bd785d30-5924-4815-ab81-780b4fbea053 |
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| Record created | 2012-07-23 |
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| Record modified | 2023-12-18 |
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