The Assessment of Armourstone for Shoreline Protection

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by R. Koopmans, Ontario Hydro Research Div, Toronto, Canada,
R. B. Watts, Ontario Hydro Research Div, Toronto, Canada,

Document Type: Proceeding Paper

Part of: Durability of Stone for Rubble Mound Breakwaters:

Abstract: To protect shorelines from erosion, Ontario Hydro is using armourstone at various Generating Stations along the perimeter of the Great Lakes. Armourstone is carefully evaluated prior to usage to ensure as far as possible that the material is suitable to withstand the effects of freezing-thawing, wetting-drying and erosion by water, wind and ice. Laboratory tests include unit weight, relative density, porosity, water absorption, freeze-thaw soundness and sonic velocity. Inspection and acceptance of armourstone is undertaken at the quarry prior to shipment. In an effort to determine the longevity of armourstone in service under severe climatic conditions, specimens of various rock types were assessed and marked at Nanticoke TGS in 1971. Results of a reassessment, which was undertaken twenty years after the original evaluation, are discussed.

Subject Headings: Shoreline | Erosion | Rocks | Freeze and thaw | Dewatering | Lakes | Wind engineering | Great Lakes | North America | Ontario | Canada

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