DEVELOPMENT OF STRENGTH CLASSES FOR TWO SELECTED NIGERIAN TIMBER SPECIES BASED ON BS 5268:2002 AND NCP2:1973
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Date
2018
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Publisher
WEBSJOURNAL OF SCIENCE AND ENGINEERING APPLICATION
Abstract
Broad range of research works have been carried out over the past few years and these have resulted in comprehensive information on materials properties of various species of timber in Nigeria. There is still research gap to cover many useful but unpopular timber species, therefore this research work is meant at characterising two commonly used timber species in Nigeria; Isoberlinia doka (Babo/Doka) and Anogeissus leiocarpus (Ayin) for structural use as well as comparing their properties with other known timber species. The logs of wood used were obtained from Irewolede Sawmill, from where tests specimen were prepared in accordance with BS 373:1957. A total of 240 test specimens were prepared from the timber species and Laboratory tests were carried out on these specimens using 100 kN Universal Testing Machine (UTM) at the National Centre for Agricultural Mechanization (NCAM), Ajase Ipo Road, Ilorin, Kwara State, to determine some of the physical and mechanical properties of the timber species. The strength properties tested includes: bending strength (MOR), modulus of elasticity (MOE), tensile strength, shear strength, compression strength (both parallel and perpendicular to grain) and cleavage strength while the physical properties tested include moisture content, specific gravity, and density. The results obtained show that the timber species are hardwood of higher strength classes (between strength classes D30 – D70) when compared with BS 5268:2002 whereas, Ayin is stronger than Babo timber species according to NCP 2:1973.
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Keywords
Ayin, Babo, Grading, Strength, Timber