Browsing by Author "Rahmon, R.O."
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Item DEVELOPMENT OF STRENGTH CLASSES FOR TWO SELECTED NIGERIAN TIMBER SPECIES BASED ON BS 5268:2002 AND NCP2:1973(WEBSJOURNAL OF SCIENCE AND ENGINEERING APPLICATION, 2018) Jimoh, A.A.; Fatolu, A.S.; Rahmon, R.O.; Babatunde, O.Y.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.Item Investigation into the Pozzolanic Effect of Brewers Dry Grain Ash (Sorghum Vulgare) as Partial Replacement of Cement in Concrete Production(Epistemics in Science Engineering & Technology, 2017) Tuleun ; ; ;, L.Z.; Jimoh, A.A.; Ozigi, P.B.; Rahmon, R.O.The production of cement, one of the major binders in the construction industry has adverse effect on the environment, contributes to global warming, and leads to depletion of limestone. On the other hand, burning of Brewer dry grain (BDG) in the open pollutes the atmosphere with attendant health consequences. To overcome the adverse effect associated with cement production and the burning of waste material, the use Brewer dry grain ash (BDGA) as partial replacement of cement in concrete production was investigated. Cement was partially replaced with BDGA at 5 %, 10 %, 15 % and 20 % in concrete. A water-cement ratio and mix ratio of 0.61 and 1:1.5:3.2 was adopted. Chemical analysis test on the ash sample was carried out in accordance with ASTM C618 (1999). The consistency, initial and final setting time test was carried out in accordance with BS EN 196-3 (1994). Eighty-five cubes of the size of 150 ×150×150 mm were cast and tested for compressive strength at 7, 14, 28 and 56 days curing. The test was carried out in accordance with BS EN 12390-1(2000). For tensile strength test, twenty-five specimens of size 100 × 100 × 200 mm were cast and tested after 28 days curing. This test was carried out in accordance with ASTM C 496-11. BDGA had a silica content of 74%, which was above the minimum of 50 % specified in ASTM C618 (1999) for any material to be classified as a pozzolan. An increase in setting time was observed with BDGA addition. A maximum compressive strength of 36.4 MPa was attained at 10 % cement replacement with BDGA ash, and the result obtained was higher than the strength of plain concrete by 25.6 %. For tensile strength, a maximum compressive strength of 3.03 was obtained at 10% replacement. This was higher than the strength of plain concrete by 13.5 %.Item Strength Characterization and Grading of Eku (Brachystegia eurycoma) Timber grown in Kwara State, Nigeria in accordance to BS 5268(Department of Civil Engineering, University of Ilorin, Ilorin, Nigeria, 2017) Rahmon, R.O.; Jimoh, A.A.; Babatunde, O.Y.; Tazou, O.L.Strength grading of timber offers a number of advantages both to the designer and the supplier of timber. This study reveals characterization and grading of Nigerian grown Eku (Brachystegia eurycoma) timber using BS 5268 (2002). Specimens used in the experiment were obtained from sawmills in Kwara State, Nigeria. The samples were seasoned naturally for seven months and prepared according to British Standard BS 373 (1957) Methods of Testing Small Clear Specimen of Timber. Test carried out on the prepared specimens were bending, tension, compression and shear parallel to grain, compression perpendicular to grain, moisture content and density. The timber properties determined were adjusted to the values at 12% and 18% moisture content in conformity with BS 5268 (2002) and NCP 2 (1973) for application in the Northern part of Nigeria. All the results were analyzed statistically. Eku has an average moisture content of 11.78% and mean air-dried density of 1148.25kg/m3. The Basic and grade stresses were computed using experimental failure stresses. The material properties showed that, Eku (Brachystegia eurycoma) can be graded and assigned to strength class D40. Therefore Eku timber has been successfully characterized and graded in accordance to British Standard and thereby recommended for load bearing structure like bridge beams.