Journal of the Korean Wood Science and Technology

The Korean Society of Wood Science & Technology (한국목재공학회)
권호 표지

Effect of Brown-rotted Wood on Mechanical Properties and Ultrasonic Velocity

  • Lee, Sang-Joon (Department of Forest Sciences, Seoul National University) ;
  • Kim, Gyu-Hyeok (Division of Environmental Science & Ecological Engineering, Korea University) ;
  • Lee, Jun-Jae (Department of Forest Sciences, Seoul National University, Researcher, Research Institute for Agriculture and Life Sciences)
  • Received : 2008.07.01
  • Accepted : 2008.08.25
  • Published : 2008.09.25
Download PDF
⟨ Previous Next ⟩

Abstract

Artificial brown-rot decay was induced to two wood species, Pinus densiflora and Pinus radiata. A modified direct inoculation method was used and the decay indicators of mass loss and two compressive mechanical properties, maximum compressive strength (MCS) and compressive stiffness, were estimated over the period of 8 weeks of fungal exposure. Measurable mass loss occurred 2 weeks after the fungal attack, with 15% to 22% of the loss occurring 8 weeks after fungal exposure with Fornitopsis palustris and Gloeophyllurn trabeurn. Mechanical properties proved to be far more sensitive than mass loss detection: approximately five to six times by quantity. Of the two mechanical properties, MCS was more sensitive to and consistent with progressive brown-rot decay. An ultrasonic test was performed to determine the feasibility and accuracy of this method for nondestructive detection of brown-rot decay. The ultrasonic test is highly sensitive at qualitative detection of the early stages of brown-rot decay.

Keywords

References

  1. Adachi, K., Y. Tamura, S. Kanda, K. Shioya, and Y. Yamashita. 1999. Development of Ultrasonic Time-of-Flight Computed Tomography System for Structural Inspection of Buildings. Technical Report of IEICE, US99-9. The Institute of Electronics Information and Communication Engineers. pp. 7-14.
  2. Clausen, C. A. and S. N. Kartal. 2003. Accelerated detection of brown-rot decay: Comparison of soil block test, chemical analysis, mechanical properties, and immunodetection. Forest Prod. J. 53(11/12): 90-94.
  3. Curling, S. F., C. A. Clausen, and J. E. Winandy. 2002. Exterimental method to quantify progressive stages of decay of wood by basidiomycetes fungi. International Biodeterioration and biodigradation 49: 13-19. https://doi.org/10.1016/S0964-8305(01)00101-9
  4. Illman, B. L., V. W. Yang, R. J. Ross, and W. J. Nelson. 2002. Nondestructive Evaluation of Oriented Strand Board Exposed to Decay Fungi. International Research Group on Wood Preservation. Cardiff, United Kingdom. IRG/WP 02-20243.
  5. Kim, K. M. and J. J. Lee. 2005. CT image Reconstruction of Wood Using Ultrasound Velocities I - Effects of Reconstruction Algorithms and Wood Characteristics. J. of the Korean Wood Science and Technology 33(5): 21-28.
  6. Kim, K. M. and J. J. Lee. 2005. CT image Reconstruction of Wood Using Ultrasound Velocities II - Determination of the Initial Model Function of the SIRT Method. J. of the Korean Wood Science and Technology 33(5): 29-37.
  7. Kim, K. M., S. J. Lee, and J. J. Lee. 2007. Cross-Sectional Image Reconstruction of Wooden Member by Considering Variation of Wave Velocities. J. of the Korean Wood Science and Technology 33(5): 21-28.
  8. Kim, G. H., W. K. Jee, and J. B. Ra. 1996. Reduction in Mechanical Properties of Radiata Pine Wood Associated with Incipient Brown-Rot Decay. J. of the Korean Wood Science and Technology 24(1): 81-86.
  9. Lee, J. J., K. M. Kim, and M. S. Bae. 2003. Investigation of transmission process for ultrasonic wave in wood. J. of the Korean Wood Science and Technology 31(2): 31-37.
  10. Machek, L., H. Militz, and R. Sierra-Alvarez. 2001. The use of an acoustic technique to assess wood decay in laboratory soil-bed tests. Wood Science and Technology 34: 467-472. https://doi.org/10.1007/s002260000070
  11. Tamura, Y., K. Adachi, Y. Yanagiya, M. Makino, and K. Shioya. 1997. Ultrasonic Time-of-Flight Computed Tomography for Investigation of Wooden Pillars: Image Reconstruction from Incomplete Time-of-Flight Profiles. J. Appl. Phys. 36(5B): 3278-3280. https://doi.org/10.1143/JJAP.36.3278
  12. Winandy, J. E., C. A. Clausen, and S. F. Curling. 2000. Predicting the Effects of Decay on Wood Properties and Modeling Residual Service-Life. Proc. of the 2nd Annual Conference on Durability and Disaster Mitigation in Wood-Frame Housing. Madison, WI. pp. 261-263.
  13. Yanagida, H., Y. Tamura, K. M. Kim, and J. J. Lee. 2007. Development of Ultrasonic Time-of- Flight Computed Tomography for Hard Wood with Anisotropic Acoustic Property. Japanese J. of Appl. Phys. 46(8A): 5321-5325. https://doi.org/10.1143/JJAP.46.5321