Evaluation of heave prevention methods for floors founded on shage in the Ottawa region

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TypeArticle
Journal titleCanadian Geotechnical Journal
ISSN0008-3674
Volume19
Issue1
Pages108111; # of pages: 4
Subjectfloors; heave; shale; prevention; concrete ( materials); weathering; black shale; pyrite oxidation; concrete coating protection
AbstractHeaving of floors founded on black shale in the Ottawa region is due to the oxidation of pyrite in it and the subsequent formation of jarosite and gypsum which crystallize between the layers of the thinly laminated fissile shale causing it to expand. Air must gain access to the shale for the oxidation reaction to occur. Work done in Ottawa indicates that air may be prevented from entering the shale by coating the freshly excavated surface with a layer of concrete before construction commences. This has been successful in preventing heave for at least seven years. Additional precautions which are needed to prevent entry of air to the shale after construction of the building are also discussed.
Publication date
LanguageEnglish
AffiliationNRC Institute for Research in Construction; National Research Council Canada
Peer reviewedYes
IdentifierDBR-P-1018
NRC number19869
1517
NPARC number20386244
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Record identifier5bcb65d7-6ac2-41f4-b3df-6b4d77e6d9a8
Record created2012-07-25
Record modified2016-05-09
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