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• W197367168 abstract "This study evaluates the physical and mechanical properties of bintangor (Callophyllumsp) laminated veneer lumber (LVL) under cyclic boil-dry (CBD) treatment. Theproperties studied were thickness swelling (TS), linear expansion (LE), water absorption(WA), delamination, bending shear and static bending (moduli of elasticity and rupture).LVLs of 1220 x 2440 mm in size were manufactured on a commercial LVL productionline. The thicknesses of the veneers were set at 3.1 and 4.1 mm, producing 17- and 13-plyLVL panels respectively. A total of two hundred and sixty four large specimens wereprepared for static bending (50 x 90 x 1000 mm) and bending shear (40 x 50 x 300 mm).To determine the effect of sample size, seventy two small static bending specimens (12.5 x 50 x 305 mm) were cut from the 13-ply LVL. The small and large static bendingspecimens were tested according to American Society for Testing and Materials D 143and AS/NZ 4063:1992 Timber – Stress-graded – in-grade strength and stiffnessevaluation respectively. Bending shear was determined according to AS/NZ 4357. In allcases, the CBD treatment procedure was conducted by taking consideration the sizefactor so that each specimen would experience similar degree of heating regime. Theanalysis of variance (ANOVA) shows that the TS, delamination, stiffness (MOE) andstrength (MOR) were significantly influenced by the specimen size, veneer thickness andnumber of CBD cycle while bending shear were significantly influenced by the numberof CBD cycle and veneer thickness. The most severely degraded were specimens thathave been treated for 10 cycles. LVL produced from thinner veneers (3.1 mm) as in 17-ply LVL, was apparently more stable where acceptably low TS, WA, LE and percentdelamination were recorded resulting in low reductions in stiffness, strength and shearafter CBD treatment. There was a negative relationship between delamination andbending shear after CBD treatment where 17-ply LVL showed a curvilinear trend whilst13-ply LVL showed a linear relationship. The study also found inspite having the same degree of heating regime, larger specimens experienced much more severe strengthdegradation which mainly caused by shear failure at the center (middle layers) of theLVL panel. The shorter span used for the large specimens (1: 10) was observed to beresponsible for the shearing effect that subsequently reduced the MOE and MOR valuesin this study. The outdoor aging revealed that MOE of smaller specimens was badlydegraded (40%) compared to the large specimens (22%) after six months of outdooraging. Large and small specimens produced from 13-ply LVL (thicker veneers)experienced more strength reduction under 6 months outdoor aging (28%) compared to10 cycles of CBD treatment (24%). MOE and MOR after any one of 2, 5 or 10 cycles ofCBD treatment showed good correlation with MOE and MOR after 3 and 6 months of outdoor aging." @default.
• W197367168 created "2016-06-24" @default.
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• W197367168 date "2004-07-01" @default.
• W197367168 modified "2023-09-26" @default.
• W197367168 title "Effects of Cyclic Boil-Dry Treatment on Properties of Bintangor (Callophyllum Sp) Laminated Veneer Lumber" @default.
• W197367168 hasPublicationYear "2004" @default.
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