Some unusual alkali-expansive aggregates
The subgreywackes from the quarry at Alert, Ellesmere Island, N.W.T., Canada, have been found by length-change tests to have a definite potential for causing expansion of concrete by a type of alkali-aggregate reaction. The rocks are physically sound but have petrographic affinities with known alkal...
| Main Authors: | , |
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| Format: | Article in Journal/Newspaper |
| Language: | English |
| Published: |
1973
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| Subjects: | |
| Online Access: | https://nrc-publications.canada.ca/eng/view/ft/?id=8ada291b-4eff-4b44-8b91-1f367f1470ec https://nrc-publications.canada.ca/eng/view/object/?id=8ada291b-4eff-4b44-8b91-1f367f1470ec https://nrc-publications.canada.ca/fra/voir/objet/?id=8ada291b-4eff-4b44-8b91-1f367f1470ec |
| Summary: | The subgreywackes from the quarry at Alert, Ellesmere Island, N.W.T., Canada, have been found by length-change tests to have a definite potential for causing expansion of concrete by a type of alkali-aggregate reaction. The rocks are physically sound but have petrographic affinities with known alkali-expansive rocks in the maritime provinces. Rocks of this sort may by recognized by a petrographer familiar with this type of problem. Les sous-grès shisteux de la carrière à Alert, Ile Ellesmere, T.N.O., Canada, possèdent, on a trouvé au moyen d'essais de changement de longueur, un potentiel réel pour provoquer la dilatation du béton par un genre de réaction alcali-agrégat. Ces roches sont physiquement saines mais dé montrent des affinités pétrographiques avec des roches expansibles à l'alcali connues des provinces maritimes. Les roches de cette espèce peuvent étre identifiées par un pétrographe familier avec ce genre de problème. Peer reviewed: No NRC publication: Yes |
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