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Corporate Law
(2023) Adebayo, Bamidele Olasehinde
Corporate Law 2
(2024) Adebayo, Bamidele Olasehinde
Use of Coconut Husk Ash and Calcium Carbide Residue as Laterite Soil Stabilizers
(2025-08-26) Oyewo Seun Temiloluwa
The ability to blend naturally occurring soil with some industrial and agricultural wastes to give better engineering properties in both strength and waterproofing is very essential. Thus, this research examines the importance of coconut husk ash (CHA) and calcium carbide residue (CCR) as laterite soil (LS) stabilisation. Various tests carried out were XRay Fluorescence (XRF) spectroscope analysis and particle size distribution of the LS while the stabilised LS with varying percentages of CHA and CCR at 2, 4, 6, 8 and 10% each using consistency limits, compaction and California Bearing Ratio (CBR) were also investigated. One-way analysis of variance (ANOVA) was used to analyse the stabilisation effects. The XRF spectroscope analysis revealed that silica-sesquioxide ratio of the soil is 0.88 indicating it as laterite while CHA and CCR are classified as class N pozzolan and cementitious material (CaO of 68.5%) respectively. The additives (CHA and CCR) at 4% improved the workability and decreased the infiltration capacity of the LS as it reduced the plasticity index from 24.6% to 6.2%. Also, at 4% CHA and CCR, the maximum dry density and optimum moisture content of the LS increased from 17.7 𝑘𝑁/𝑚3 to 20.5 𝑘𝑁/𝑚3 and decreased from 11.8% to 9.1% respectively which enhanced the compactness of the LS. The blend of 10% CHA and CCR have the highest CBR value of 20.6% which significantly improves the strength of the LS. ANOVA showed that both additives had statistically significant (p < 0.05) effects on the CBR of the LS. The results indicated that the use of CHA and CCR can improve the engineering properties of laterite soil for use as subgrade pavement.
EXPERIMENTAL DETERMINATION OF MODULUS OF ELASTICITY OF OVEN DRIED COCOA-BEANS VARIETIES
(International Journal of Mechanical Engineering and Technology, 2018) Olabamiji Taye Sola
In the present study, the modulus of elasticity of three dried cocoa bean varieties (N38, F3, and WA) was determined through compressive and tensile property tests. The tests were carried out with a universal material tester. The average maximum compressive force and deflection were 21.46±8.013 N and 6.37±2.331 mm; 54.41±3.819 N and 8.82±3.787 mm; and 44.11±12.617 N and 4.0±0.557 mm, respectively, for N38, F, and WA. The average maximum tensile force and the corresponding elongation for the three investigated varieties (N38, F, and WA) were 1.037_0.356, 2.680±1.178, and 2.250±0.368 N, and 5.326±0.883, 4.941±0.783, and 6.45±2.1357 mm, respectively. The average value of the modulus of elasticity for N38, F3, and WA was 0.4338 ± 0.056, 1.055±0.214 and 1.121 ± 0.207 MPa, respectively. The result of this work will be useful in the design of dried cocoa bean processing machines.
Finite Element Modeling of Temperature Cycles in Axi-Symmetric Flash Butt Welded Thin Steel Rods and Experimental Validation
(Journal of Engineering Research, 2016) Olabamiji Taye Sola
Flash butt welding is a process designed to produce a forge-type butt weld between two metal pieces of similar shape. A one-dimensional finite element (FE) modeling of the temperature profile in axi–symmetric flash butt welded steel rods was carried out and results were verified by experimentation. A linear interpolation function was used in the weighted residual expression which was transformed into a matrix temperature values. Non-uniform nodal spacing was used with more concentration of nodes around the heat affected zone (HAZ). Welding process variables examined include; effect of pre-heat temperature, flash temperature, flash duration, and material geometries on temperature profile at various points along the rod. With a typical weld rod diameter of 5 mm and length 40 mm, at weld flash duration of 2 seconds peak temperatures of 572.6, 304.8, 214.2 and 170 0C were attained at distances 1, 2, 3 and 4 mm respectively from weld canter. At a distance 5 mm from weld center the thermal profile computed by finite element model were compared with experimental results obtained using type k thermocouple. Peak temperature values of 134.8 °C and 132 °C obtained for FE modeling and laboratory experiments respectively indicating a good agreement to within 2.1 % between peak temperatures.