Effects of different impregnation chemicals on combustion characteristics and decay resistance of wood
نویسندگان
چکیده
This study was aimed to determine combustion characteristics and decay resistance of Spruce [Picea orientalis (L.)], Fir (Abies nordmanniana), Alder [Alnus glutinosa (L.)], and Iroko (Milicia excelsa) woods impregnated with ammonium tetrafluoro borate (1 to 3%) and the mixture of cement and borax (6% to 9%). The combustion test method was performed in three stages: flame stage, without flame stage, and glowing stage according to ASTM E 160-50. Our results showed that the lowest temperature according to the experimental results, determined the Alder wood test sample as having the highest retention ratio (46.07 kg/m 3 ). The highest percentage retention was observed in Fir wood with ammonium tetra fluoro borate (6.19%). In combustion from flame; highest temperature was observed in Alder wood with 9% cement + borax mix (576°C), highest light intensity was observed in Alder control wood (267 Lux). Total combustion durations; longest was observed in Iroko (53.33 min), whereas the shortest is observed in Alder wood (17.36 min). White decay fungus caused significant weight loss of control samples and as the concentration of the solution increased, the weight loss decreases.
منابع مشابه
The Influence of Geomorphological Characteristics of Forest Sites on the Decay Dynamics of Dead Trees in Asalem Forests, Western Hyrcanian Region
Knowledge of the decay trend of dead trees and site factors affecting their functions, plays an important role in the development of conservation management plans in forestry projects. This research was conducted in Asalem beech forests in northern Iran to assess the impact of physiographic features of the site on the process of dead trees decay. A total of 90 sample cuts of dead beech stumps w...
متن کاملImprovement of the Durability of Heat-treated Wood against Termites
Thermal modification is an attractive alternative to improve the decay durability and dimensional stability of wood. However, thermally modified wood is generally not resistant to termite attacks, limiting the field of application of such materials. One way to overcome this drawback is to combine thermal modification treatment with an additional treatment. One such treatment is the impregnation...
متن کاملAcetylation of wood – A review
Wood is a porous three dimensional, hydroscopic, viscoelastic, anisotropic bio-polymer composite composed of an interconnecting matrix of cellulose, hemicelluloses and lignin with minor amounts of inorganic elements and organic extractives. Some, but not all, of the cell wall polymer hydroxyl groups are accessible to moisture and these accessible hydroxyls form hydrogen bonds with water. As the...
متن کاملThe effect of lignin content and lignin modification on Norway spruce wood properties and decay resistance
This thesis describes studies with three different Norway spruce cutting clones in three growing environments differing in soil and climatic conditions within the boreal zone. The main aim was to follow variation in the radial growth rate, wood properties and lignin content and to modify wood lignin with a natural monolignol, coniferyl alcohol, by making use of inherent wood peroxidases. In add...
متن کاملEvaluation of Axial Impregnation as an Alternative to Classical Wood Vacuum Pressure Impregnation Method
The evolution of laws on the use of biocide products has led to important changes in the field of wood preservation leading to an increasing interest for non “biocidal treatments” like thermal or chemical modifications. While thermal modifications become more and more common on industrial scale, development of chemical modifications progresses slowly. One reason for the challenges encountered i...
متن کامل