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Revista Caatinga

Print version ISSN 0100-316XOn-line version ISSN 1983-2125

Abstract

FREITAS, FABIANA PAIVA DE et al. EFFECT OF HYDROTHERMAL AND FREEZING TREATMENT ON THE PHYSICAL AND MECHANICAL PROPERTIES OF EUCALYPTUS WOOD. Rev. Caatinga [online]. 2017, vol.30, n.4, pp.938-946. ISSN 0100-316X.  http://dx.doi.org/10.1590/1983-21252017v30n414rc.

Wood, in general, is a material with excellent properties; however, some features may limit its use. In this sense, various thermal treatments are emerging as alternatives to improve the technological properties of wood. In this context, this study aims at analyzing the effects of time and temperature (hydrothermal treatment and freezing) on the physical and mechanical properties of Eucalyptus grandis W. Hill ex Maiden. Three trees were selected, and only the heartwood was used to obtain the test body dimensions of 30 × 8 × 3 cm (length × width × thickness). The treatments were carried out at three temperatures of -20, 60, and 100°C, each at three exposure times (5, 10, and 15 h). Temperature treatment at -20°C was conducted in a domestic freezer, while the treatments at 60 and 100°C were administered in a Parr reactor, where the timber was submerged in water. Regardless of the exposure time, the timbers heat-treated at 100°C showed more efficiency, since this treatment unclogged the pores, reduced hygroscopicity, and promoted further darkening and uniformity of color, without changing the density and mechanical strength of the wood.

Keywords : Heartwood; Parr reactor; Heat treatment..

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