Browsing by Author "Alabi, AB"

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    Cooling Effect of Some Materials in Clay Composite Bricks for Tropical Region
    (School of Environmental Sciences, Modibbo Adama University of Technology, 2014) Alabi, AB; Babalola, OA; Nwankwo, LI; Olatunji, S
    The thermal resistive effect of embedded materials in composite bricks resulting in cooling has been investigated. Different particulate materials and continuously aligned polyethylene fibers were used as supposed thermal resistors in preparing the bricks for houses in the tropical region. The face change in temperature {Outside temperature(T1) – Inner Temperature (T2)} across the brick insulated with particulate wood dust, paper, PVC, palm kernel, glass, and no-material are 27.9, 27.5, 19.0, 24.0, 25.5, and 26.6 °C respectively after 90 minutes and 26.2, 26.3, 17.9, 22.9, 22.8 and 24 °C respectively after 120 minutes. It is observed that ΔT°C after 90 and 120 minutes are higher for wood dust and paper than brick with no material but lower for PVC, palm kernel, and glass. A high face change in temperature indicates a drop in temperature T2, resulting in a cooling effect if used in building bricks. The same cooling effect was observed when continuous and aligned polyethylene fibers were used to make fiber–clay composite bricks. A side of each sample was subjected to the heat of about 70°C and heat transferred was measured at the other side as done for particulate-embedded bricks. Change in temperature ΔT°C was found to increase with the increasing quantity of polyethylene fibers embedded in the samples 34.2°C (0%), 35.4°C (0.5%), 35.5°C (1%), 35.7°C (1.5%), 36.6°C (2%) and 37.4°C (2.5%), these show that heat transfer decreases due to decrease in T2 with the quantity of fiber. The result shows that the effect is continuous and tends to equilibrium and the change in temperature becomes steady with time.
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    Structural and Qualitative Analysis of Solid Minerals (Marble) in Selected Locations in Nigeria
    (Nigerian Institute of Physics, 2013) Alabi, AB; Olatunji, S; Babalola, OA; Nwankwo, LI; Johnson, LM; Odutayo, JO; Alabi, A
    Marbles are formed from the recrystallization of limestone or dolomite during metamorphism and occur as a coarse-grain rock composed of interlocking calcite crystals. The structural and porosity analysis of some selected Nigerian marbles were investigated with a view of establishing crystal configuration and constituents of the marble in Nigeria namely: Igbeti, Oyo State; Olayinka, Kwara State; Jakura, Kogi State; Biribiri, Niger State and Takalafia, Nassarawa State. The samples were examined by X-ray diffraction which confirmed the presence of CaCO3 in all the samples. Other constituents present are Calcium Magnesium, Calcium Magnesium Carbonates, and Magnesium Carbide. The average grain sizes of the Samples are 32.15, 31.42, 31.47 and 30.95 nm from Igbeti, Olayinka, Biribiri, Takalafia, and Jakura respectively. The samples were further examined by density profiling to determine the porosity of the marble samples. The comparison of the dry and wet density of the samples in percentage change in density revealed the porosity of all the samples and it was deduced that the marble sample has different pore size due to their formation processes. The porosity for the samples are as follow: from Igbeti (69%), Biribiri (62.4%), Takalafia (24.9%), Olayinka (10.3%), and Jakura (13.8%).
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    Structural, Mineralogical and Quantitative Characterizations of Compositions of Products Linked to Explosive Volcanic Eruption at Haleakala, USA
    (College of Natural and Applied Sciences, University of Dar es Salaam, 2020) Alabi, AB; Akinsola, IS; Olatunji, S; Ogunyinka, C; Osanyinlusi, O
    This research focused the analysis vis-à-vis structural, mineralogical and quantitative characterizations of the samples which appeared to be formed from leftover of volcanic eruption sourced from basaltic magma obtained from Haleakala Hill, USA. The results show the presence of natural minerals like pyrolusite, zincite, magnetite, quartz, and diopside with their compositional concentrations in the samples. The geophysical analysis done corroborates the results obtained from the Scanning Electron Micrograph, which confirms the porosity of one of the samples. The X-Ray Diffraction results reveal the average grain sizes of the samples to range between 16 nm and 25 nm. Sample 'A' showed 4.693% weight increase, while sample 'B' showed 7.724% when soaked for some days. This research project prospects in harnessing natural minerals from products of volcanic eruption, though an occurrence regarded as a natural disaster. The work suggests an alternative route to mining of minerals, by exploring the contents of the products of this so-called disaster.