Abstract
The objectives of this study were to evaluate the effect of heat treatment of eucalypt wood (Eucalyptus grandis Hill ex Maiden) on the dynamic modulus of elasticity by using the stress wave nondestructive method and also to determine the air-dry density variation, weight loss and equilibrium moisture content following treatment. Heat treatments were performed at four different temperatures (180, 200, 215 and 230°C) and for three different durations (15 min, 2 and 4 h). The results revealed a significant reduction in air-dry density following heat treatment independent of temperature and time. A significant weight loss was observed between and within treatments. The treatment at 230°C for 2 and 4 h produced a weight loss of 20.5 and 26.5%, respectively, which was statistically different from other treatment conditions. The dynamic modulus of elasticity decreased by about 13% in the most severe treatment (230°C for 4 h). Depending on the temperature and time, the equilibrium moisture content was significantly reduced within the range of 40–74%.
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Akyildiz MH, Ateş S (2008) Effect of heat treatment on equilibrium moisture content (EMC) of some wood species in Turkey. Res J Agric Biol Sci 4(6):660–665
Bodij J (2000) The process of NDE research for wood and wood composites. In: 12th International symposium on nondestructive testing of wood, University of Western Hungary, Sopron, 13–15 Sep. Available at http://www.ultrasonic.de/article/v06n03/bodig/bodig.htm. Accessed 26 Feb 2009
Borrega M, Kärenlampi PP (2008) Mechanical behavior of heat-treated spruce spruce (Picea abies) wood at constant moisture content and ambient humidity. Holz Roh Werkst 66:63–69
Brito JO, Garcia JN, Bortoletto G Jr, Pessoa AMC, Silva PHM (2006) The density and shrinkage behavior of Eucalyptus grandis wood submitted to different temperatures of thermoretification (in Portuguese). Cerne 12(2):182–188
Brunetti M, Cremonini C, Crivellaro A, Feci E, Palanti S, Pizzo B, Santoni I, Zanuttini R (2007) Thermal treatment of hardwood species from Italian plantations: preliminary studies on some effects on technological properties of wood. In: International scientific conference on hardwood processing, Québec City, 24–26 Sep. Available at http://www.ischp.ca/FR/pdf/ISCHP_proceedings.pdf. Accessed 26 Feb 2009
Esteves B, Marques AV, Domingos I, Pereira H (2007) Influence of steam heating on the properties of pine (Pinus pinaster) and eucalypt (Eucalyptus globulus) wood. Wood Sci Technol 41(3):193–207
Garcia RA, Cloutier A, Riedl B (2006) Dimensional stability of MDF panels produced from heat-treated fibres. Holzforschung 60(3):278–284
Garcia RA, Riedl B, Cloutier A (2008) Chemical modification and wetting of medium density fibreboard produced from heat-treated fibres. J Mater Sci 43:5037–5044
Kamdem DP, Pizzi A, Jermannaud A (2002) Durability of heat-treated wood. Holz Roh Werkst 60:1–6
Korkut DS, Guller B (2008) The effects of heat treatment on physical and surface roughness of red-bud maple (Acer trautvetteri Medw.) wood. Bioresour Technol 99:2846–2851
Korkut S, Hiziroglu S (2008) Effect of heat treatment on mechanical properties of hazelnut wood (Corylus colurna L.). J Mater Design (in press). doi:10.1016/j.matdes. 2008.07.009
Mburu F, Dumarçay S, Bocquet JF, Pétrissans M, Gérardin P (2008) Effect of chemical modifications caused by heat treatment on mechanical properties of Grevillea robusta wood. Polymer Degrad Stab 93:401–405
Repellin V, Guyonnet R (2003) Evaluation of heat treated beech by non destructive testing. First European Conference on Wood Modification, Ghent, Belgium,0 3–4 Apr. Available at http://hal.inria.fr/docs/00/12/37/23/PDF/Gand-VR-RG.pdf. Accessed 26 Feb 2009
Rowell RM, Lange S, Mcsweeny J, Davis M (2002) Modification of wood fiber using steam. In: 6th pacific rim bio-based composites symposium. Workshop on the chemical modification of cellulosics, Portland, Oregon, USA. (2):606–615
Santos J (2000) Mechanical behaviour of eucalyptus wood modified by heat. Wood Sci Technol 34(1):39–43
SAS Institute Inc. (2003) The analyst application. 2nd edn. Cary, NC: SAS Institute Inc. Available at http://support.sas.com/documentation/cdl/en/anlystug/58352/HTML/default/chap16_index.htm. Accessed 26 Feb 2009
Seborg RM, Tarkow H, Stamm J (1953) Effect of heat treatment upon the dimensional stabilization of wood. J Forest Prod Res Soc 3(3):59–67
Shi JL, Kocaefe D, Zhang J (2007) Mechanical behaviour of québec wood species heat-treated using thermowood process. Holz Roh Werkst 65(4):255–259
Unsal O, Ayrilmis N (2005) Variations in compression strength and surface roughness of heat-treated Turkish river red gum (Eucalyptus camaldulensis) wood. J Wood Sci 51:405–409
Vital BR, Lucia RM, Della RM, Euclides RF (1983) Effect of heating on some properties of Eucalyptus saligna wood. Revista Árvore 7(2):136–146
Yildiz S, Çolakoğlu G, Yildiz ÜC, Gezer ED, Temiz A (2002) Effects of heat treatment on modulus of elasticity of beech wood. In: 33rd annual meeting of the international research group on wood preservation, Cardiff, Wales, UK, 12–17 May. Available at http://www2.spm.slu.se/bitwon/Others/IRG+02-40222%5B1%5D.pdf. Accessed 26 Feb 2009
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Garcia, R.A., de Carvalho, A.M., de Figueiredo Latorraca, J.V. et al. Nondestructive evaluation of heat-treated Eucalyptus grandis Hill ex Maiden wood using stress wave method. Wood Sci Technol 46, 41–52 (2012). https://doi.org/10.1007/s00226-010-0387-6
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DOI: https://doi.org/10.1007/s00226-010-0387-6