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

From National Research Council Canada

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  1. National Research Council of Canada
FormatText, Article
Subjectfloors; heave; shale; prevention; concrete (materials); weathering; black shale; pyrite oxidation; concrete coating protection
Abstract
Heaving 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.
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  • Canadian Geotechnical Journal 19, no. 1 (February 1982): 108–111.
LanguageEnglish
Peer reviewedYes
IdentifierDBR-P-1018
NRC numberNRCC 19869
NRC-IRC-1517
NPARC number20386244
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Record identifier5bcb65d7-6ac2-41f4-b3df-6b4d77e6d9a8
Record created2012-07-25
Record modified2024-03-22
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