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Browsing STEM by Subject "ACE: New Pedagogy in Engineering Education"

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    Effect of iron ore tailings on the plasticity and compaction properties of selected tropical soils
    (IOP Conf. Series: Materials Science and Engineering, 2021) Yohanna, P; Sani, R. O; Ishola, K .
    The workability of any soil, when used as a construction material, is greatly affected by its plasticity and compaction characteristics. This research investigates the effect of iron ore tailings (IOT) on the plasticity and compaction properties of lateritic soil (LTS) and black cotton soil (BCS). Atterberg limit and compaction test using three energies, British standard Light, BSL, British standard Heavy, BSH, and West Africa standard, WAS were carried out. These tests were conducted on mixed ratios of 0, 2, 4, 6, 8, and 10 % of IOT mixed each with LTS and BCS separately. A Statistical conceptual model was developed using Minitab R15 to predict the values of the maximum dry density (MDD) and optimum moisture content (OMC) from the computed laboratory results. Analysis was then carried out on the predicted results using origin pro version 8 to test the efficacy of results obtained. The result of specific gravity test shows increase with IOT concentration. An improvement on the plasticity of the modified soil was noted. The liquid limit for both LTS and BCS decreased with increasing IOT concentration. Values drop from 43.4 to 42.7% for LTS and 56 to 52.6% for BCS at 0 and 10% of IOT content, respectively. Plastic limit increased with increasing IOT concentration for LTS and decreased for BCS. In the case of the Plasticity index, values decreased for LTS and marginally increased for BCS treated with IOT. MDD values increased and thereafter drop for LTS treated with IOT while for BCS values increased from natural up to 10% IOT content. OMC values increased for LTS treated with IOT and decreased for BCS treated with IOT. The effectiveness of the developed model was validated using the values of the correlation coefficient obtained from the statistical analysis, which showed a solid relationship between predicted and measured values. Plasticity index values obtained for IOT stabilized BCS did not meet up to the standard requirement when used as a sub-base and base course material respectively. However, the treatment of LTS and BCS with 8-10% IOT improved the soil properties and can be used for pedestrian walkways
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    Exploring the Constructive Alignment of Pedagogical Practices in Science and Engineering Education in Sub Saharan African Universities: A Nigerian Case Study
    (International Journal of Engineering Pedagogy, 2020-11-15) Adewumi, Olayinka Omowunmi; Yinka-Banjo, Chika; Bajeh, Amos; Alli-Oke, Razak
    Improved pedagogical approaches in teaching science and engineering are crucial to solving the most pressing technological challenges faced in most developing countries especially in Sub-Saharan African Universities. Despite the avalanche of programs to train faculty members to fill this need, there is a need to conceptualize benchmarks for evaluating how teaching should be delivered to students in our institutions. The aim of this paper is to showcase how science and engineering courses can be taught in a more effective manner in our universities, with a pilot deep-dive into a few courses taught in the faculties of science and engineering in selected Nigerian Universities using the backward design approach. Five (5) case studies of undergraduate science and engineering courses were outlined and the backward design approach was used to put them into context. These case studies show how courses can be taught and assessed following three important steps. Distinct recommendations for science and engineering faculty members based on the outcome of this study are: defining clear learning objectives and outcomes, aligning assessment and evaluation methodologies, and constructively aligning all aspects of the curriculum and instructional materials. In addition, learning outcomes can be evaluated real-time in the classroom using the proposed pedagogies.