Mechanical and Chemical Behavior of Beech Wood Modified by Heat


  • Umit Cafer Yildiz
  • Sibel Yildiz
  • Engin Derya Gezer


Heat treatment, Fagus orientalis, thermal degradation


In this study the effects of heat treatment on compression strength of beech wood (Fagus orientalis) were examined, and changes in the chemical structure of the treated wood were determined by analyzing contents of cellulose, hemicellulose, and lignin.

Heat treatment was applied on the test samples in an oven at four different temperatures (130°C, 150°C, 180°C, and 200°C) and three different durations (2, 6, and 10 h) under atmospheric pressure.

The results indicate that the effects of heat treatment on compression strength values generally exhibited a decrease with increased duration and temperature as expected. In the chemical properties, it was seen that hemicelluloses were the wood-cell components most degraded by the heat treatment.


American Society for Testing and Materials (ASTM). 1988. D 143. Standard Methods of Testing Small Clear Specimens of Timber. American Society for Testing and Materials, Philadephia, PA. 1988.nAvni, E., F. Davoudzadeh, R.W. Coughlin. 1985. Flash pyrolysis of lignin. Page 329 in Fundamentals in Thermochemical Biomass Conversion. R.P. Overend, T.A Milne, and L.K. Mudge, eds. London, Great Britain.nFengel, D. 1967. On the changes of the wood and its components within the temperature range up to 200°C-Part IV: The behaviour of celluloses in spruce wood under thermal treatment. Holz Roh-Werkst. 25:102-111.nFengel, D., and G. Wegener. 1989. Wood. chemistry, ultrastructure, reactions. Walter de Gruyter and Co. Berlin, New York. 613 Pp.nJämsä, S., and P. Viitaniemi. 2001. Heat treatment of wood better durability without chemicals. Pages 17-22 in A.O. Rapp, ed. Review on heat treatments of wood. Cost Action E22. Proc. Special Seminar. Antibes, France.nKollmann, F., and D. Fengel. 1965. Changes in the chemical composition of wood by thermal treatment. Holz Roh-Werkst. 23(12):461-468.nKotilainen, R. 2000. Chemical changes in wood during heating at 150-260°C Ph.D. Thesis, Research Report 80. Jyväskylä University. Finland.nKwasniakova, K., B.V. Kokta, and Z. Koran. 1996. Strength properties of black spruce wood under different treatment. Wood Sci. Technol. 30:463-475.nManninen, A.M., P. Pasanen, and J.K. Holopainen. 2002. Comparing the VOC emissions between air-dried and heat-treated Scots pine wood. Atmos. Environ. 36(11): 1763-1768.nMilitz, H. 2002. Thermal treatment of wood: European processes and their background. IRG/WP 02-40241. 33rd Annual Meeting, Cardiff, Wales.nMitchell, P.H. 1988. Irreversible property changes of small loblolly pine specimens heated in air, nitrogen, or oxygen. Wood Fiber Sci. 20(3):320-355.nRosa, M.E., and M.A. Fortes. 1988. Temperature induced alterations of the structure and mechanical properties of cork. Mater. Sci. Eng. 100:69-78.nRunkel, R.O.H., and K.D. Wilke. 1951. Chemical composition and properties of wood heated at 140 to 200°C in a closed system without free space, Part II. Holz Roh-Werkst. 9:260-270.nRusche, H. 1973. Thermal degradation of wood at temperatures up to 200°C-Part I: Strength properties of dried wood after heat treatment. Holz Roh-Werkst. 31:273-281.nStamm, A.J. 1956. Thermal degradation of wood and cellulose. Ind. Eng. Chem. 48(3):413-417.nYildiz, S. 2002. Physical, mechanical, technological and chemical properties of beech and spruce wood treated by heating. Ph.D. Dissertation, Karadeniz Technical University, Trabzon, Turkey.n






Research Contributions