DOI QR코드

DOI QR Code

Ten-Year Performance of Shell-Treated Wooden Deck

  • RA, Jong Bum (Department of Interior Materials Engineering, Gyeongnam National University for Science and Technology)
  • Received : 2019.07.10
  • Accepted : 2019.10.16
  • Published : 2019.11.25

Abstract

The performance of a wooden deck made of refractory materials that have difficulties in achieving target penetrations as stipulated in the specification and quality standards for treated wood in Korea, was assessed via a case study in this research. A wooden deck built in Jinju in 2009 was selected for this study because of its fabrication method using pressure and treated refractory materials. The penetration and retention analysis did not satisfy the domestic standard for treated wood. Inspection of the deck in 2019 revealed that the deck had been attacked by decay fungi. Cap rails showed much deeper and wider checking on their surface compared with the top and base rails, resulting in a severe fungal attack. The decking boards exhibited severe fungal decay primarily in the end parts. However, the rails and balusters without checks and posts were virtually free of fungal attack irrespective of the preservative penetration measures. Copper content in the soil 5 cm away from the deck was less than 150 mg/kg, implying that copper movement in the soil was very limited. These results suggest that the inhibition of surface propagation and the protection of end surfaces are essential factors in increasing the longevity of treated wooden decks; further, the results also showed that the deck was within an acceptable range from the point of copper contamination.

Keywords

copper contamination;refractory species;surface checks;wooden deck

Acknowledgement

Supported by : Gyeongnam National University of Science and Technology

References

  1. American Wood Protection Association (AWPA). 2012a. AWPA Standard T1-12. Processing and treatment standard. AWPA, Birmingham, AL.
  2. American Wood Protection Association (AWPA). 2012b. AWPA Standard A3-08. Standard methods for determining penetration of preservatives and fire retardants. AWPA, Birmingham, AL.
  3. American Wood Protection Association (AWPA). 2012c. AWPA Standard A2-11. Standard methods for analysis of waterborne preservatives and fire-retardant formulations, Birmingham, AL.
  4. American Wood Protection Association (AWPA). 2012d. AWPA Standard A17-09. Standard for determination of dedecyldimethylammonium chloride in ACQ solutions, Birmingham, AL.
  5. American Wood Protection Association (AWPA). 2012e. AWPA Standard E25-08. Standard field test for evaluation of wood preservatives to be used above ground (UC 3B): decking method. Birmingham, AL.
  6. Amburgey, T. L., Ragon, K. W. 2008. "Treating" treated wood-decks. Mississippi State University Southern Climatic Housing (SCH) Report 8
  7. Canadian Standards Association (CSA). 2015. CSA O80 Series. Wood Preservation. CSA, Etobicoke, ON.
  8. Choi, Y.S., Oh, S.M., Kim, G.H. 2011. Evaluation of pretreatment moisture content and fixation characteristics of treated wood for pressure treatment of Japanese red pine and Japanese larch skin timber with ACQ, CUAZ, and CuHDO. Journal of the Korean Wood Science and Technology 39(6):481-489. https://doi.org/10.5658/WOOD.2011.39.6.481
  9. EN 350-2. 1994. Durability of wood and wood-based products. Natural durability of solid wood. Part 2. Guide to natural durability and treatability of selected wood species of importance in Europe.
  10. Freeman, M.H., Mclntyre, C.R. 2008. A comprehensive review of copper-based wood preservatives with a focus on new micronized or dispersed copper systems. Forest Products Journal 58(11): 6-27.
  11. Kang, S.M., Kim, G.H., Paik, K.H. 1995. Treatment characteristics of Japanese larch heartwood with CCA or CCFZ and improving its CCA treatability by incising techniques. Journal of the Korean Wood Science and Technology 23(4): 60-66.
  12. Kim, T., Ra, J.B., Kang, S.M., Wang, J. 2011. Determination of decay hazard index (Scheffer index) in Korea for exterior above-ground wood. Journal of the Korean Wood Science and Technology 39(6): 531-537. https://doi.org/10.5658/WOOD.2011.39.6.531
  13. Kim, T., Ra, J.B. 2013. Decay hazard (Scheffer) index values in Korea for exterior aboveground wood. Forest Products Journal 63(3-4): 91-94. https://doi.org/10.13073/FPJ-D-13-00033
  14. Kim, T., Ra, J.B. 2014. Change of decay hazard index (Scheffer index) for exterior aboveground wood in Korea. Journal of the Korean Wood Science and Technology 42(6): 732-739. https://doi.org/10.5658/WOOD.2014.42.6.732
  15. Morris, P.I., Morrell, J.J. 2014. Penetration and performance in western species. Proceeding, American Wood Protection Association. 110: 148-158. AWPA, Birmingham AL.
  16. National Institute of Forest Science. 2018. The specification and quality standard of wood products, Notification No. 2018-8.
  17. Ra, J.B. 2015. Evaluation of soil contamination by copper depleted from ACQ-treated wood. Journal of the Korean Wood Science and Technology 43(4): 504-510. https://doi.org/10.5658/WOOD.2015.43.4.504
  18. Ra, J.B., Ingram, J., Wang, J., Morris, P.I. 2017. Evaluation of preservative efficacy for refractory wood species in field tests and its implication for Korean wood preservation industry. Journal of the Korean Wood Science and Technology 47(5): 544-558.
  19. Townsend, T., Solo-Gabriele, H., Tolaymat, T., Stook, K., Hosein, N. 2003. Chromium, copper, and arsenic concentrations in soil underneath CCA-treated wood structures. Soil & Sediment Contamination 12(6): 779-798. https://doi.org/10.1080/10588330390254829