Variation of Material Properties of Fire-killed Timber (I) - Mechanical Properties of Fire-killed Korean Red Pine in the East Coast Area -

Fire-killed trees of Korean red pine are valuable resources for industrial uses. It is common only believed that fire-killed trees are too weak and brittle to use in construction purposes. The misunderstandings of fire-killed trees lead these valuable resources abandonment. The purposes of this research are focused on scrutinization of material properties of fire-killed trees to facilitate industrial uses of these resources. The sample logs were collected from the forest fire site of the eastern coast area in which the most catastrophic wild fire had taken place in 2000. Fire-killed Korean red pines were classified into 3 levels by the degree of fire damage so called light, medium and heavy, then their physical, mechanical and chemical properties were compared with sound trees. No significant difference in physical appearances were found in the cross sections by degree of damage compared to sound tree but bark char. Investigation on mechanical and chemical properties indicates that forest fire did not impact significantly in lowering the strength of damaged trees. It was concluded that there was any limitation of forest fire-killed trees of Korean red pine in industrial utilization.

산불 피해목의 재질 변화에 관한 연구(I) - 동해안 산불 피해 소나무의 재질 특성 -

산불로 인해 발생한 소나무 피해목은 귀중한 자원으로 활용가치가 있지만 과학적 근거가 없는 일반적 속설 때문에 이용이 기피되고 있다. 본 연구는 산불피해목의 산업적 활용에 필요한 재질을 평가하기 위해 수행하였다. 2000년 동해안에서 발생한 산불피해지에서 산불피해 소나무를 피해등급 "심", "중", "경"으로 구분하여 공시목으로 채취하고, 이들에 대한 물리적, 역학적, 화학적 특성을 조사하여 건전재와 비교하였다. 피해목의 육안적 현미경적 특성은 피해등급에 따른 차이가 없었다. 역학적 성능과 화학적 조성분의 비교에서도 건전재와 차이를 발견할 수 없었다. 이러한 연구결과로부터 산불 발생 직후 산불피해목의 산업적 이용에 요구되는 재질상의 제약요인은 없는 것으로 판명되었다.