SUSTAINABILITY AND STRESS PROPERTIES OF SELECTED HARDWOOD TIMBER SECTION IN LAGOS, NIGERIA
Hardwood Timber sections are usually used for structural members in various areas in construction works; hence the knowledge of wood strength properties is important. Reconnaissance survey of common hardwoods used in Lagos was made, Ikorodu area was used to gather respondent social and timber technical data with the aid of questionnaire. The physical and mechanical properties five (5) selected hardwood timbers species was carried out in accordance with BS 373 (1957); the species scientific names are Hallea ciliata, Uacapa guineensis, Albizia zygia, Sacoglottis gabonensis and Symphonia globulifera. Small clear specimen samples of 20 x 20 x 20 mm, 20 x 20 x 60 mm and 20 x 20 x 300 with respect to BS 373 were used to carry out the test on Shear strength, Specific gravity (SG), Moisture Content (MC), Maximum Compressive Strength parallel to grain (MCS//), Modulus of Elasticity (MOE) and Modulus of Rupture (MOR) respectively. 35 x 35 x 750 mm specimen was used for the third point bending test. The result showed Uacapa guineensis having the highest MOE of 21635.1N/mm2 with a minimum MC of 20.4%, and Symphonia globulifera and Uacapa guineensis having Shear strength of 7.34 and 7.33 N/mm2 respectively.
|Keywords: hardwood, hallea ciliate, uacapa guineensis, modulus of elasticity, modulus of rupture.|
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