A Test for "unsoundness" of cements containing magnesium oxide

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Proceedings titleVTT Symposium
ConferenceProceedings of the 3rd International Conference on the Durability of Building Materials and Components: 12 August 1984, Espoo, Finland
Subjectcement; autoclaving; magnesium; oxides; portland cements; hydration; microhardness; expansion; porosity; autoclaved cements; mgo; Concrete; ciment; autoclavage; magnesium; oxyde
AbstractTwo 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.
Publication date
AffiliationNRC Institute for Research in Construction; National Research Council Canada
Peer reviewedYes
NRC number24116
NPARC number20375715
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Record identifier8e124b4c-a318-450a-af48-0792248e18d0
Record created2012-07-23
Record modified2016-05-09
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