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Creator:: Gonzalez, June Mitsuhashi and Morrell, Jeffrey J.
Abstract:: Assessing the impact of fungal decay in wood structures poses a major challenge for building inspectors. Although models have been developed to predict degradation rate of building components in varying climatic conditions, most are hampered by the lack of fundamental data on effects of fungal attack on engineering properties. Developing...
Resource Type:: Article
Full Text:: : jmitsuhashi@yahoo.com Jeffrey J. Morrell*{ Professor Department of Wood Science & Engineering Oregon State

Creator:: Canessa, Edwin F. and Morrell, Jeffrey J.
Abstract:: The fungitoxicity of carbon disulfide (CS2), methylisothiocyanate (MITC), or a mixture of these two gases, to selected wood-degrading fungi was studied by using a fumigation apparatus. Both gases are important decomposition products of metham sodium, the most commonly used fumigant for internal treatment of large wood members. Carbon disulfide (up...
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Full Text:: . Morrell Associate Professor Department of Forest Products Oregon State University Corvallis, OR 9733

Creator:: King, David T., Sinha, Arijit, and Morrell, Jeffrey J.
Abstract:: Wood shear walls are the main lateral force-resisting system for wood-frame construction. Water intrusion and subsequent decay around connections can significantly impact shear wall behavior, but these problems are seldom studied. In this study, effects of water intrusion and fungal attack on shear wall capacity were examined using small-scale (610-...
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Full Text:: * Corresponding author { SWST member Wood and Fiber Science, 47(1), 2015, pp. 74-83 # 2015 by the Society of Wood

Creator:: Freitag, Camille M. and Morrell, Jeffrey J.
Abstract:: The heartwood of western redcedar (Thuja plicuta) is known for its natural resistance to fungal attack, but some users of western redcedar utility poles have suggested that its durability may be diminished as suppliers begin to harvest trees from younger stands. The decay resistance of western redcedar samples from the...
Resource Type:: Article
Full Text:: Department of Forest Products Oregon State University Corvallis, OR 97331 (Received February 2000

Creator:: Morrell, Jeffrey J., Gupta, Rakesh, Winandy, Jerrold E., and Riyanto, Djoko S.
Abstract:: This study evaluated the effects of pretreatment incising of dry lumber and preservative treatment on the shear strength of 1980 pieces of 2 X 4 dimension lumber (nominal 50 mm X 100 mm X 3.6 m long). Three species groups (Douglas-fir, Hem-Fir. and Spruce-Pine-Fir-South) and two commercially produced machine-stress-rated grades...
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Full Text:: Department of Forest Products Oregon State University Corvallis, OR 97331 Jerrold E. Winandy Research

Creator:: Kim, Gyu Hyeok and Morrell, Jeffrey J.
Abstract:: Supercritical fluids can markedly enhance preservative treatment of wood, but the high pressures employed can lead to collapse. We investigated the effects of the rates of pressure application and release on displacement of white spruce lumber during supercritical impregnation with carbon dioxide. Displacement was greatest when pressure was rapidly increased...
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Full Text:: Department of Forest Products Oregon State University Corvallis, OR 9733 1 (Received January 1999

Creator:: Acda, Menandro N., Morrell, Jeffrey J., and Levien, Keith L.
Abstract:: The effects of supercritical fluid (SCF) impregnation on physical properties of composites were investigated at various pressures, temperatures, and treatment times with carbon dioxide as the fluid and tebuconazole as a biocide. In general, within the ranges tested, SCF treatment had no negative effects on modulus of rupture (MOR), modulus...
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Full Text:: Associate Professor Department of Forest Products Oregon State University Corvallis, OR 97331 and

Creator:: Morrell, Jeffrey J. and Sexton, Camille M.
Abstract:: Differences in stain susceptibility were evaluated on sterile and unsterile samples of freshly sawn, frozen and thawed, or oven-dried and rewetted ponderosa pine sapwood. Samples treated with sterile medium or with medium inoculated with either Pseudomonas putida or Bacillus subtilis were inoculated with selected wood-staining fungi. In general, fresh unsterile...
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Full Text:: Research Assistant Department of Forest Products Oregon State University Corvallis, OR 9733 1-7402

Creator:: Zahora, Andrew R. and Morrell, Jeffrey J.
Abstract:: High concentrations of the fumigant methylisothiocyanate (MITC) will effectively control decay fungi in large wood structures, but the fungitoxicity of low MITC concentrations and the influence of wood moisture content (MC) on its performance are not well understood. The MC of Douglas-fir heartwood greatly influenced the susceptibility of the decay...
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Full Text:: Department of Forest Products College of Forestry Oregon State University Corvallis, OR 9733 1 and

Creator:: Gezer, Engin Derya, Michael, Judd H., and Morrell, Jeffrey J.
Abstract:: Although boron has many advantages as a wood preservative, this chemical performs poorly in leaching exposures. In this study, we investigated the potential for decreasing the leachability of boron preservatives with polyethylene glycol (PEG). Southern pine (Pinus spp.) test samples impregnated with combinations of sodium borate or boric acid and...
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Full Text:: WCIOD PRESERVATIVES' Engin Derya Gezer Graduate Research Assispant Department of Forest Products

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