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A test for "unsoundness" of cements containing magnesium oxide

From National Research Council Canada

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  1. National Research Council of Canada
FormatText, Article
ConferenceProceedings of the 3rd International Conference on the Durability of Building Materials and Components: 12 August 1984, Espoo, Finland
SubjectConcrete; cement; autoclaving; magnesium; oxides; Portland cements; hydration; microhardness; expansion; porosity; autoclaved cements; MgO
Abstract
Two normal portland cements, each mixed with 0-25% SiO[2] and 0-5% MgO, were subjected to autoclaving, atmospheric steam, or water-curing at 50 or 100 degrees C and their degree of hydration, microhardness, expansion and porosity determined. Maximum expansion, hydration and porosity occurred in autoclaved cements containing MgO. A microhardness value of 66-71 kg/mm[2] in cements cured at 25 degrees C for 28 days could be obtained by autoclaving cements containing 20-25% SiO[2] for 3 h. The cement-SiO[2] mixture exhibited lower autoclave expansion than normal cements and may be used for a realistic assessment of unsoundness.
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  • VTT Symposium 50 (1984): 3:46–54.
LanguageEnglish
Peer reviewedYes
IdentifierDBR-P-1261
NRC numberNRCC 24116
NRC-IRC-3045
NPARC number20375715
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Record identifier8e124b4c-a318-450a-af48-0792248e18d0
Record created2012-07-23
Record modified2024-03-22
Date modified: