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Development of Pitch Pine Glued Laminated Timber for Structural Use -Improvement of Bending Capacity of Pitch Pine Glulam by Using Domestic Larch Laminars-  

Kim, Kwang-Mo (Div. of Wood Performance, Dept. of Forest Products, Korea Forest Research Institute)
Shim, Kug-Bo (Div. of Wood Performance, Dept. of Forest Products, Korea Forest Research Institute)
Park, Joo-Saeng (Div. of Wood Performance, Dept. of Forest Products, Korea Forest Research Institute)
Kim, Wun-Sub (Div. of Wood Performance, Dept. of Forest Products, Korea Forest Research Institute)
Lim, Jin-Ah (Div. of Wood Performance, Dept. of Forest Products, Korea Forest Research Institute)
Yeo, Hwanmyeong (Dept. of Forest Sciences, College of Agriculture & Life Sciences, Seoul National University)
Publication Information
Journal of the Korean Wood Science and Technology / v.35, no.6, 2007 , pp. 13-22 More about this Journal
Abstract
This study was carried out to scrutinize possibility of manufacturing pitch pine (Pinus rigida) glued laminated timber in order to add values of pitch pine trees. Also, it was investigated to improve bending performance of pitch pine glulam. Pitch pine was imported as one of major plantation species in Korean peninsula. Machine stress rated grades of pitch pine lumber mostly ranged between E7 and E9. which grades were more or less inferior to producing high quality glulam. However, the adhesive properties between pitch pine and pitch pine, and between pitch pine and Japanese larch (Larix kaempferi Carr.), such as shear bond strength, wood failure rate and de-lamination rate of bonded layer submerged in cold and boiling water, were higher than Korean Standard criteria. These properties are essential for manufacturing glulam with single species or multiple species. The modulus of rupture (MOR) of pitch pine glulam exceeded the criterion of Korean Standard for glulam strength grade but modulus of elasticity (MOE) was lower than the criterion. On the other hand, the bending performances (MOR and MOE) were improved 20 percent by mixing with Japanese larch laminar. It is effective to arrange higher quality Japanese larch laminar at the outer layer of glulam for improving bending performances. In conclusion, it is possible to use low quality pitch pine as laminar of structural glulam for adding values of pitch pine.
Keywords
pitch pine; Japanese larch; glulam; MOR; MOE; adhesive properties;
Citations & Related Records
Times Cited By KSCI : 4  (Citation Analysis)
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