Yazar "Ohmura, Wakako" seçeneğine göre listele

Listeleniyor 1 - 2 / 2
  • Küçük Resim Yok
    Öğe
    Durability Ratings of Post-treated Wood-based Composites after 14 Years of Field Exposure
    (North Carolina State Univ Dept Wood & Paper Sci, 2024) Tascioglu, Cihat; Yoshimura, Tsuyoshi; Ohmura, Wakako
    Several commercial wood -based composites (softwood plywood [SWP], hardwood plywood [HWP], medium -density fiberboard [MDF], oriented strand board [OSB], and particleboard) [PB]) were post -treated with alkaline copper quat and copper azole at two different retention levels. The treated specimens were installed on concrete blocks covered with 5 -sided PVC boxes simulating the crawl space conditions (protected aboveground) in Japanese houses in Southern Japan where decay and termite activity are high. The experimental variables are a comparison of treated versus untreated, preservative type and retention levels. During 14 years of exposure, the specimens were biannually visually rated. In general, termite damage became visible earlier and the harshness of attack was higher when compared to decay damage. The untreated and treated MDFs were the most resistant under the protected above ground conditions at the end of 14 years exposure. Particleboard durability performance followed the MDF rating during the same period. The untreated OSB, HWP, and SWP were the least resistant composite types. The treatments substantially increased the durability of the mentioned composite types by 317.6%, 80.5%, and 133% higher termite grading when correlated to their untreated controls, respectfully, yet they failed to maintain full protection. Based on statistical analysis, preservative types and retention levels did not significantly affect decay and termite ratings.
  • Küçük Resim Yok
    Öğe
    Effect of Cryogenic Process on Trametes versicolor and Fomitopsis palustris Fungal Destruction in ThermoWood® Products of Some Wood Species
    (North Carolina State Univ Dept Wood & Paper Sci, 2025) Aytin, Ayhan; Tascioglu, Cihat; Uygur, Ilyas; Ohmura, Wakako
    Aspen, ash, spruce, and fir trees naturally grown in Turkey were obtained directly from the forest and processed using ThermoWood (R)(TM) processing at two different temperatures (190 degrees C: TW1 and at 212 degrees C: TW2). Then, cryogenic treatment (Cr) was applied to the samples, and they were placed in a jar containing Trametes versicolor (COV) and Fomitopsis palustris (TYP) mushrooms. Their weight loss (WL) was measured after 12 weeks. Although WL results varied depending on the tree type and the applied processes, it has been understood that Cr application can be effective in reducing WL. According to the study, the lowest WL was determined to be in COV fungus with 1.2% in cryogenically treated fir tree TW2 samples. The highest WL was in TYP mushrooms with 56.1% in spruce TW1 samples that received heat treatment (HT). The results obtained from the study show that cryogenic treatment may be an alternative method for reducing WL in heat treated wood species.