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Flame Resistance and Durability of Compressed Structural Wood through Microwave Heat Drying Method

마이크로파 가열건조법에 의한 압축 구조용 목재의 방염 및 내구성

  • Lim, Nam-Gi (Department of Architectural Engineering, Tongmyong University)
  • Received : 2011.02.07
  • Accepted : 2011.04.08
  • Published : 2011.04.20

Abstract

As the result of implementing a treated material test and durability test after quickly drying S.P.F. species, a type of softwood structural material, within a short period time, soaking it in liquid phosphate flame proof agent for an hour, microwave heating it, and compressing it from 3.8cm to 1cm, when setting the appropriate heating time of microwave heating at 7 minutes at 5kW, it is observed that it satisfies the target water content (4~5%). It is shown that in a water content measurement of the wood that is compressed after being softened by soaking in the flame proof agent, drying and heating at 3kW for 9 minutes, all specimens satisfied 12~14%, the appropriate water content for exterior wood. Also, it is shown that in terms of the flame performance obtained through a flame resistance treatment of the compressed wood and a treated material test, the specimen soaked in flame proof agent for 30 minutes was the most excellent, and that the performance test result of the compressed wood in all areas, such as nail withdrawal resistance, compression, bending strength, and shearing strength, were all improved in their mechanical features to twice to three times better performances.

침엽수 구조재인 S.P.F 수종을 마이크로파로 단시간에 급속 건조시켜 액상의 인산염계 방염약제에 시간별로 침지시킨 후 2차 마이크로파 가열을 한 다음 3.8cm의 두께에서 1cm를 압축시켜 방염 후 처리물품 시험과 내구성 시험을 실시한 결과 1차 마이크로파 적정 가열시간은 5kW에서 7분 동안 가열할 경우 목표 함수율(4~5%)을 만족하는 것으로 나타났다. 인산염계 방염약제에 침지, 건조 후 3kW로 9분 동안 가열시켜 연화된 상태에서 압축된 목재의 함수율 측정결과 시험편 모두 외부용 목재의 적정 함수율인 12~14%의 범위를 만족하는 것으로 나타났다 또한 압축된 목재의 방염후 처리물품 시험을 통한 방염성능은 방염약제에 30분간 침지된 시험편이 가장 우수한 것으로 나타났으며 압축된 목재의 성능 시험 결과 경도, 못뽑기 저항, 압축, 휨강도, 전단 강도 모두 약 2~3배 이상 역학적 특성이 향상되었다.

Keywords

References

  1. Lim NG, Domestic Architectural Wood Research and Current Situation of Industry and Advanced Wood Material Development Tendency, Journal of the Korea Institute of Building Construction 2010;10(6):6-15.
  2. Lim NG, A Basic Study on Intensity Characteristics of Dimension Lumber of Coniferous Tree Heated by Microwave by Compressibility, Journal of the Architectural Institute of Korea, Structure 2009;29(1):491-495.
  3. Korea Industrial Standards, KS F 2201 General Rules of Wood Test Methods.
  4. Park CW. Experimental Study for High Durability Structural Wood Treated with Microwave and Phosphate Flame Proof Agent [MA dissertation]. Busan: Tongmyung University; 2009.
  5. Cho JM. Illustrated world wood. Goyang: Sunjin-munwhasa; 1998. p.85-97
  6. Lim NG, Basic Study for Water Resistant, Flame Resistant Wood Development Applying Dielectric Heating Microwave, Proceedings of the Journal of Architectural Institute of Korea, Spring Conference 2008;8(1):35-42.
  7. Lee PW, Wood Engineering, Seoul: Hyangmum; 1981. p.170
  8. Um YG, Wood Encyclopedia, Seoul: Wood Korea; 2005. p.15

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