Development of EN 338(2003) Strength Classes of Doka (Isoberlinia doka), Madaci (Khaya senegalensis) Gawo (Acacia albida) and Rimi (Ceiba pentandra) Timber Species of Nigerian Origin
Development of EN 338(2003) Strength Classes of Doka (Isoberlinia doka), Madaci (Khaya senegalensis) Gawo (Acacia albida) and Rimi (Ceiba pentandra) Timber Species of Nigerian Origin
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Date
2012-12
Authors
RABIU, Ismaila.
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Abstract
In this research work, laboratory experiments were conducted to generate bending strengths,
modulii of elasticity, moisture contents and densities of four common timber species: [Doka
(Isoberlinia doka), Madaci (Khaya senegalensis) Gawo (Acacia albida) and Rimi (Ceiba
pentandra)]. These timber species which are common from Northern Nigeria. Extensive review
of relevant literature was undertaken to provide background information on the specie under
investigation. The experiments conducted were in accordance with the EN 408 (2003). The
generated properties include bending strength, density, modulus of elasticity, other properties
such as tension and compression strength parallel and perpendicular to the grain, shear strength
and shear modulus were also computed. Two-way analysis of variance (ANOVA) was
undertaken using analysis-it software, with the view to examine the equality of mean values of
material properties within and between each of the tested species. The results indicated that, all
the samples of particular specie considered come from the same population. Likewise, the
difference between the mean values of the tested species are significant .The species were
assigned to appropriate strength classes defined in the EN 338 (2009). Doka (Isoberlinia doka),
was assigned to strength class D30, Madaci (Khaya senegalensis) to strength class D35, Gawo
(Acacia albida) to strength class C16, and Rimi (Ceiba pentandra) to strength class C14. The
data was analyzed with the Easy fit (2010) statistical package in accordance with the EN 384
(2004) The stochastic models (mean, coefficient of variation and distribution models) of each
species were generated.
Description
A thesis submitted to the Postgraduate School
Ahmadu Bello University Zaria, Nigeria
In partial fulfillment of the requirements for the award of degree of
Master of Science in Civil Engineering
Department of Civil Engineering
Faculty of Engineering
Ahmadu Bello University, Zaria
Nigeria
December, 2012
Keywords
Development,, EN 338(2003) Strength Classes of Doka,, Madaci (Khaya senegalensis) Gawo (Acacia albida),, Rimi (Ceiba pentandra) Timber Species of Nigerian Origin.