Characterization and Grading of Monoon Longifolium and Albizia Lebbeck Timber Species According to Bs 5268 (2002), En 338 (2009) and Ncp 2 (1973)

Abstract

This research is aimed at establishing strength categories for two native tree species from Northern Nigeria, Monoon longifolium and Albizia lebbeck, by characterizing and grading them according to established standards (BS 5268-2, EN 338, NCP 2) in order to reduce dependency on commonly utilized timber varieties. The study encompassed laboratory experiments for evaluating their physical and strength attributes, followed by categorization into specific strength classes, based on parameters like bending stress, density, and modulus of elasticity. After characterization and grading, Monoon longifolium and Albizia lebbeck were assigned to strength classes D30 and D50 respectively, according to BS 5268-2 (2002). According to NCP 2 (1973), the timber species were assigned to strength classes N6 and N3 in the same order. The samples were also assigned to strength classes D30 and D50 respectively, according to EN 338 (2009). The results indicated that both Monoon longifolium and Albizia lebbeck qualify as a hardwood, presenting potential applications in boat construction, roofing materials, doors, windows, light construction formwork, and general construction, diversifying timber resource utilization.