Seid Mahmood Kazemi
Abstract
In order to evaluate resistance of commercial wood species of alder and horn beech, logs were cut to lumbers. After caution of reduction moisture content, the lumbers were converted to special marine samples. The wood blocks were impregnated by CCA (Chrome- Cupper-Arsenic) and Betel method. Then treated ...
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In order to evaluate resistance of commercial wood species of alder and horn beech, logs were cut to lumbers. After caution of reduction moisture content, the lumbers were converted to special marine samples. The wood blocks were impregnated by CCA (Chrome- Cupper-Arsenic) and Betel method. Then treated and untreated wood samples were installed in one meter depth of water at seaside of Amirabad port, for 3, 6, 9 and 12 months. The result of observations showed that, the staining fungi and balanus were able to colonized surface of control samples. However, treated specimens were only occupied by balanus and with increasing time (3 to 12 months) balanus presence were major. The numerical result showed that untreated samples of alder were reduced in weight about 3.5% and treated samples not only had no weight losses but also increased in weight to12.21%. In the case of horn beech the result indicated that the weight loss of control was 2.7% and treated samples -7.9%. Also on surfaces of treated samples on both wood species were no sign of staining fungi. Finally could conclude the water of Caspian Sea is safe for using treated woods by many operations.
Management and Economics wood
Sayed mahmood Kazemi; Mehran Jalilvand
Abstract
Wood Plastic Composite as new wood component products is made by wood fiber or powder elements with thermoset or thermoplastic materials. In recent periods of ten years the components have been produced by west industrial countries and as well in UnitedState of America as wood water resistant materials. ...
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Wood Plastic Composite as new wood component products is made by wood fiber or powder elements with thermoset or thermoplastic materials. In recent periods of ten years the components have been produced by west industrial countries and as well in UnitedState of America as wood water resistant materials. Samples of wood plastic and untreated wood specimens of maple and elm were prepared in laboratory. The effects of water, fire and fungus (Trametes versicolor) on the wood samples with using ASTM and EN standards were investigated. The results showed that the highest resistance wood samples against fire was related to wood plastic made by polypropylene and the lowest resistance of wood samples was associated to untreated maple. In the case of floating samples in water, results indicated that increase cross section of wood plastic decreases the rate of water penetration in wood samples. The results of fungal attack in laboratory tests on wood plastic samples showed that component made by 30 % polypropylene and 30% polyethylene and 40% wood fiber is able to resist significantly against rotting fugal.
The weight loss of untreated maple samples against fungal attack was 38.5% that probably is related to being high percent of sugar and starch materials in wood species. There was a difference about 3% of weight loss between natural maple (control) and maple treated by sea water. Therefore, maple is a perishable species in wood durability classification. Heartwood of elm was very resistant to wood rotting fungus and the mean weight loss of wood samples was 3.75%. As a result in wood classification this wood specie is very durable. Appling of sea water only 0.5% increased wood resistance to fungal activity. The results of fungus attack on wood plastic showed this wood product is very resistant and during 6 weeks incubation only 3.14% of its weight was decreased.
Sayed mahmood Kazemi; Aliakbar Enayati; Heshmatalah Rahymian
Abstract
The durability of following five wood species: Zelkova carpinifolia, Ulmus glabra, Pterocarya fraxinifolia, Carpinus betulus and Acer laetum were studied. Wood blocks exposed to Trametes versicolor(a white rot fungus) under laboratory conditions according to DIN52176 standard. After 16 weeks incubation ...
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The durability of following five wood species: Zelkova carpinifolia, Ulmus glabra, Pterocarya fraxinifolia, Carpinus betulus and Acer laetum were studied. Wood blocks exposed to Trametes versicolor(a white rot fungus) under laboratory conditions according to DIN52176 standard. After 16 weeks incubation the heart wood of Z. carpinifolia showed 2.19% reduction in weight loss, while U glabra with 41.69%, C. betulus with 45.64%, A. laetum with 53.03% and P. Fraxinifolia with 43.08% weight losses were very decayed. For finding relationship between amount of wood decay and wood extractives a regression was carried out. The percentages of extractive materials by using T20403 standard were 13.84% in Z. carpinifolia, 4.51% in U. glabra, 2.74% in C. betulus, 3.88% in A. laetum, and 4.11% in P. fraxinifolia. Finally there was a negative correlation between rate of decay and amount of wood there was expect P. fraxinifolia. for all wood species extractives.
