Graduate Thesis Or Dissertation

 

Serviceability of Douglas-fir marine piles and control of their deterioration Public Deposited

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https://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/bg257k16t

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  • In an exploratory survey of the serviceability of wood in the marine environment in the Pacific Northwest, pressure-creosoted piling with tops protected from wetting by the superstructure provided 40 and more years of service and showed little or no indication of deterioration. The service life of these piling is still to, be realized. However, wind driven rain, deck leaks, drainage, and improper construction practices can lead to deterioration of these piles. Fender, marina, bulkhead, and other piles with tops exposed to rain wetting are far more difficult to protect and can contain decay fungi within 1 year and advanced internal decay within 4 years. Brush-coating exposed pile tops with creosote or pentachlorophenol may delay decay by as little as 1 year. Solid crystals of ammonium bifluoride and a paste of fluor-chrome- arsenic-phenol have prevented decay in 89 and 100% of simulated cutoff Douglas-fir pile tops after 3 years. Internal decay of pressure-creosoted Douglas-fir piles has been stopped within the 1st year after treatment with volatile fungicides. Fungitoxic vapors of Vorlex (methylisothiocyanate and dichloropropenes) and chloropicrin (trichloronitromethane) but not Vapam (sodium N-methyldithiocarbamate) remain within these piles 5 years following treatment. Fungitoxic vapors of methyiisothiocyanate (active ingredient in Vorlex) moved 1.2 meters upward from the treating site within piles in 1 year. Internal decay in untreated Douglas-fir piles can be controlled by the use of fumigants but external and top decay are more difficult to control with fumigants alone. Vorlex or chloropicrin prevented shipworm attack of untreated Douglas-fir panels at Newport, Oregon. Vorlex slowed Limnoria attack in San Francisco Bay and Los Angeles Harbor but prevented such attack at Newport. Vapam was ineffective.
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