Microstructural properties of blended cement mortars and their relation to durability

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ConferenceProceedings of the RILEM Seminar on the Durability of Concrete Structures under Normal Outdoor Exposure: 1984-03, Hannover, Germany
Pages13340; # of pages: 94
Subjectcement mortar; durability; physical properties; concrete admixtures; Mortar; Concrete
AbstractA 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.
Publication date
PublisherInstitut fur Baustoffkunde und Materialprufung der Universitat Hannover, Nienburger Strasse 3, D-3000 Hannover 1, Germany
AffiliationNRC Institute for Research in Construction; National Research Council Canada
Peer reviewedYes
NRC number24949
NPARC number20375974
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Record identifierbd785d30-5924-4815-ab81-780b4fbea053
Record created2012-07-23
Record modified2016-05-09
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