EFFECTS OF THERMAL TREATMENT ON THE PHYSICAL AND MECHANICAL PROPERTIES OF IROKO (MILICIA EXCELS) WOOD

Abstract

The aim of this research is to investigate the effects of thermal treatment on the physical and mechanical properties of a selected indigenous Nigerian wood. In order to achieve the research aim, Iroko (MiliciaExcels) wood samples obtained from Ala forest in Akure, Ondo state, Nigeria were subjected to heat treatment at varying temperatures (80 oC, 100 oC, 120 oC, 140 oC and 160 oC) with constant treatment duration of 6 hours and for varying time durations at constant temperature of 120 oC. The following characteristics: moisture contents, density, dimensional shrinkages, shearing strength, compression strength, tensile strength, modulus of rupture in bending static (MOR) of the Iroko (Milicia excels) wood were studied. The results showed that all the values of the characteristics studied decreased with increasing treatment temperature and treatment time, except hardness that behaved otherwise. At 120 oC the Iroko wood has the best physical and Mechanical properties similar to that of Teak that makes it suitable for technological applications such as Handles of Agricultural implements and tools, its durability makes it suitable for boat building piles, other marine work and rail road crossties. Iroko wood is also found suitable in many and most carpentry and joinery, flooring, furniture, veneer and cabinet works.