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Abstract
In June 2009, the authors conducted a comprehensive on-site evaluation of the timber crib foundation at Alaska’s Historic Kennecott Mine Concentration Mill Building. The primary goal of the 6-day inspection was to assess the physical conditions of the existing timber crib foundation and identify timber members and areas that have structural deficiencies. The inspection process included visual assessment, species identification/confirmation, moisture content determination, stress wave scanning test, resistance micro-drilling, and core-drilling. Extensive deterioration was noted in the timber crib foundation members at the lower floors of the mill building. The upper levels of the timber crib foundation exhibited less deterioration, especially in areas where the timber crib cells were not filled with soil. Current efforts are focusing on a comprehensive structural evaluation of the Concentration Mill building with the goal of stabilizing and preserving this historical mining building important to the cultural heritage of early 20th century America.
Keywords
Wood deterioration,
historic buildings,
conservation,
restoration,
weathering of buildings,
wooden buildings,
Alaska,
Wrangell-Saint Elias National Park and Preserve,
Pseudotsuga menziesii,
Douglas fir,
moisture,
wood moisture,
inspection,
nondestructive testing,
mechanical properties,
drilling,
boring,
micro-drilling,
stress waves,
foundations,
maintenance,
repair,
wood decay,
Kennecott Mine,
moisture content,
crib foundation,
structural timbers,
historic mine,
substructure
Citation
Wacker, James; Wang, Xiping; Rammer, Douglas R. 2010. Field investigation of a 100-year-old timber crib foundation at a historic copper mine. In: Proceedings of the 11th World Conference on Timber Engineering, 2010 June 20-24, Riva Del Garda, Italy [electronic resource]. [S.l. : s.n.], 2010: [1 CD ROM]: [4] p.
