The elastic properties of earlywood and latewood and their variability were measured in 388 specimens from six loblolly pine trees in a commercial plantation. Properties measured included longitudinal modulus of elasticity, shear modulus, specific gravity, microfibril angle and presence of compression wood. Novel testing procedures were developed to measure properties from specimens of 1 mm=1 m...

having observed the costly failures of different cutoff walls, that had been constructed according to the mix design specified by reputable consultants in iran, a research programme was conducted to study the effects of constituent materials on the properties of plastic concrete. the main properties, such as compressive strength, biaxial and triaxial strains, permeability, and modulus of elasti...

Recovery of chromated copper arsenate (CCA)-treated wood for reuse has been the focus of several international research groups due to the imminent disposal problem created when large quantities of CCA-treated wood ultimately come out of service. Bioleaching with Bacillus licheniformis CC01 and oxalic acid extraction are two methods known to remove significant quantities of metals from CCA-treat...

The aims of this work were to determine the color change and physical–mechanical properties polystyrene glulam from three tropical wood species. Wood laminas cut logs harvested a young plantation forest manii (Maesopsis eminii), mangium (Acacia mangium), rubber-wood (Hevea brasiliensis). impregnated with monomer styrene that was polymerized using potassium peroxy-disulfate as catalyst heat. Thr...

Kekayaan alam berupa serat yang ada di Indonesia sangat berlimpah dan beberapa dari tersebut berpotensi untuk dijadikan sebagai pengisi dalam pembuatan papan komposit. Penelitian ini bertujuan mengetahui sifat mekanik komposit berbahan dasar bonggol jagung batang pisang serta umengetahui apakah dihasilkan memenuhi standar baku mutu SNI 03-2105-2006. dilakukan dengan terlebih dahulu mempersiapka...

today, the use of coatings is common to maintain the quality of fruits in storage period. previous studies have shown that the calcium compounds can improve and preserve the strength of fruit’s cell wall. in this research, the effect of calcium chloride dehydrate (cacl2*2h2o) concentration on two varieties of apple (golden delicious and red delicious), was studied. the apples were immersed in t...

Many stands of Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco) near coastal areas of Oregon and Washington are heavily infected with the foliar pathogen causing Swiss needle cast (SNC) disease, and yet there is very little research on the resulting wood quality. Modulus of elasticity (MOE), modulus of rupture (MOR), microfibril angle (MFA), wood density, latewood proportion, and sapwood mois...

in this research, the mechanical properties of seven types of nanofilm with differing amounts of silver and silver-clay particles were studied. the elasticity of modulus, tensile strength, toughness, elongation at break, tear strength and color of nanofilms were compared with those of ordinary ldpe film. results showed that the inclusion of nano particles increased the modulus of elasticity, te...

during the past two decades the use of lignocellouse fibers in reinforcing composites has attracted much research activities. in the present work, date palm fiber was used for production of composites compatible withliving environment. the fibers were pre-treated chemically to remove impurities. in order to verify and compare the effectiveness of the pretreatment methods, lignin, ash, moisture ...

Abstract Self-blowing lignin-furanic foams were produced using formulations comprising Kraft lignin and furfuryl alcohol as the major components. Diethyl ether, Tween 85 sulphuric acid used blowing agent, surfactant catalyst. The influence of components ratio to was investigated with regard foam density, mechanical properties, water absorption, thermal fire behaviour. Depending on formulation, ...