Compression molded composites were made from wood particles and a liquefied wood/phenol/formaldehyde co-condensed resin. Based on our previous research, a phenol to wood (P1W) ratio of 2/1 was chosen for this study. The two experimental variables selected were: 1) liquefaction temperature (1500 and 180°C) and 2) cooking method (atmospheric and sealed). Panels were tested in static bending for m...

This study demonstrates the feasibility of using a simple method to measure the resonant fundamental frequency for determining the MOE (dynamic Young’s modulus) of lime and cement mortars. The procedure follows the instructions stated in the UNE-EN ISO 12680-1 standard for refractory products although in this study the instructions are applied to standardized RILEM 4x4x16 cm test samples made o...

Laminated Veneer Lumber (LVL) panels made from poplar (Populus ussuriensis Kom.) and birch (Betula platyphylla Suk.) veneers were tested for mechanical properties. The effects of the assembly pattern on the modulus of elasticity (MOE) and modulus of rupture (MOR) of the LVL with vertical load testing were investigated. Three analytical methods were used: composite material mechanics, computer s...

this study evaluated the effects of end to end joint types of athel stripes at three level (end to end basic, end to end mitrated and end to end half lap joint) used in core layer veneered with three wood species (fir, beech and oak) and glued with three different ratio of melamine formaldehyde/urea formaldehyde resin (0:100, 25:75 and 50:50) on the bending strengths of bloakboard. according to...

gypsum-bonded particleboard panels were made from various mixture of bagasse (saccharum ossicinarum l.) and wheat (oryza sativa l.) straw particles bonded with different ratio level of particles/gypsum. this study examined possible feasibility of bagasse and wheat straw particles in the production of gypsum-bonded particleboard (gbpb). one-layer experimental gbpb with density of 1.05 and 1.20 g...

This study investigates the impact of adhesive spread rates and lamina assembly patterns on physical mechanical properties glue laminated lumber (glulam) manufactured from Kelempayan wood (Neolamarckia cadamba (Roxb.) Bosser). For this purpose, lab-scale 3-ply homogenous glulams were using low-MOE, average-MOE, high-MOE laminas, mixed low-high-low-MOE high-low-high-MOE lamina, with an rate 100 ...

Wood-plastic composites (WPC) have been developed into new and important wood-based composites because of their benefits for the environment, economy, and recyclability. When combined with structural adhesives, WPCs will have a greatly broadened application in the construction field. In this work, epoxy resin and acrylic ester were used to bond WPC adhesive joints. The shear strength of the adh...

During the past decade the southern pine industry has adopted technology for kilndrying dimension lumber at temperatures above the boiling point of water. Does exposure to such temperatures diminish the mechanical properties of southern pine? Previous research (Koch 1971) has indicated that when dried 21 hours at 240 F (100 F wet-bulb temperature) with crosscirculation air velocity of 1,(XX) £p...

langbour p, gérard J, roda Jm, ahmad fauzi p & guibal d. 2011. Comparison of wood properties of planted big-leaf mahogany (Swietenia macrophylla) in martinique island with naturally grown mahogany from brazil, mexico and peru. Big-leaf mahogany (Swietenia macrophylla) has been harvested and traded since the 16th century. It is highly valued and is used to craft luxury furniture and items. Its n...

Two important wood properties are the modulus of elasticity (MOE) and the modulus of rupture (MOR). In the past, the statistical distribution of the MOE has often been modeled as Gaussian, and that of the MOR as lognormal or as a twoor three-parameter Weibull distribution. It is well known that MOE and MOR are positively correlated. To model the simultaneous behavior of MOE and MOR for the purp...