STRUCTURAL GRADE PROPERTIES OF SOME’ SELECTED NIGERIAN TIMBER SPECIES: Chlorophoral excelsa (Iroko); Khaya senegalensis (Mahogany); Ceiba pentandra (Araba); and Daniellia oliveri (Maje).
STRUCTURAL GRADE PROPERTIES OF SOME’ SELECTED NIGERIAN TIMBER SPECIES: Chlorophoral excelsa (Iroko); Khaya senegalensis (Mahogany); Ceiba pentandra (Araba); and Daniellia oliveri (Maje).
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Date
2014-04
Authors
AKINWANDE, Gabriel Kayode,
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Abstract
In this research work, structural grade properties of some selected Nigerian timber species
namely: Chlorophoral excelsa (Iroko), Khaya senegalensis (Mahogany), Daniellia
oliveri (Maje) and Ceiba pentandra (Araba) were carried out after classifying the species
to international strength classification system using EN338 (2008) with the aid of
statistical package Easyfit (2010). This was done after establishing the physical and
mechanical properties of the species in the laboratory using ASTM D193 (2000) and
EN408 (2003). Chlorophoral excelsa was assigned to strength Class D70 with
characteristic density of 474.95 kg/ , bending strength of 74.76 N/ and modulus of
elasticity of 9,899.32 . Khaya senegalensis was assigned to strength Class D70
with characteristic density of 800.21 kg/ , bending strength of 80.64 N/ and
modulus of elasticity of 8,944.0 . Daniellia oliveri was assigned to strength Class
D50 with characteristic density of 509.01 kg/ , bending strength of 57.6 N/ and
modulus of elasticity of 6,865.87 N/ and Ceiba pentandra was assigned to strength
Class C40 with characteristic density of 300.78 kg/ bending strength of 41.16 N/
and modulus of elasticity of 4,423.64 N/ . Also, the distribution models were
established for Chlorophoral exelsa, Khaya senegalensis, Daniellia oliveri and Ceiba
pentandra to be normal, lognormal ,gumbel and weibull respectively.
Description
A THESIS SUBMITTED TO THE POSTGRADUATE SCHOOL,
AHMADU BELLO UNIVERSITY, ZARIA
IN PARTIAL FULFILMENT OF THE REQUIREMENTS FOR
THE AWARD OF THE DEGREE OF MASTER OF SCIENCE
(M.Sc) IN CIVIL ENGINEERING, DEPARTMENT OF CIVIL
ENGINEERING, AHMADU BELLO UNIVERSITY,
ZARIA , NIGERIA.
APRIL, 2014
Keywords
STRUCTURAL,, GRADE,, PROPERTIES,, SELECTED,, NIGERIAN TIMBER,, SPECIES:,, Chlorophoral excelsa (Iroko, Khaya senegalensis,, (Mahogany), Ceiba pentandra,, (Araba),, Daniellia oliveri,, (Maje).