Browsing by Author "Adeleke, A.A"
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Item Combustion characteristics of fuel briquettes made from charcoal particles and sawdust agglomerates(Elsevier, 2019-06-25) AJAO, KABIRU SULEIMON; Shuaib-Babata, Y. L; Adeleke, A.A; Ajimotokan, H. A; Ikubanni, P.PThe combustion characteristics of fuel briquettes made from Idigbo ( Terminalia ivorensis ) charcoal particles, pinewood ( Pinus caribaea ) sawdust and their agglomerates using gela- tinized cassava peels were investigated. The charcoal particles and pine sawdust were blended in the mixing ratios of 90:10, 80:20, 70:30, 60:40, and 50:50, respectively and vice-versa. More so, briquettes were produced from pure charcoal particles and pine saw- dust separately for the purpose of comparison with the blended briquettes. The gelatinized binder was 5% of the total briquettes weight. The briquettes were produced using a pres- sure of 5 MPa with a dwelling time of 5 min in a hydraulic briquetting machine. Proximate, elemental compositions and heating value analyses were carried out on the raw charcoal, sawdust, cassava peel, and their briquettes. The results showed that variations in the mix- ing ratios of the bio-residues had significant effects on all the properties investigated. An increase in the charcoal particles led to an increase in the fixed carbon content and heat- ing value of the briquettes. Conversely, higher pine sawdust content in the briquette re- sulted in higher volatile matter content and lower heating value. The briquette made from pure charcoal particles had the highest heating value (24.9 MJ/kg) and ash content (6.0%). Its carbon, hydrogen, and oxygen contents were in the range of 44.6–50.1%, 5.1–5.6% and 34.4–41.5%, respectively. The proximate analysis, elemental composition analysis, and heat- ing values of the produced fuel briquettes depicted that they have better combustion prop- erties when compared to the raw charcoal, pine dust, and cassava peel. Thus, the produced briquettes would serve as good fuel for domestic and industrial applications.Item Microstructural assessment of AISI 1021 steel under rapid cyclic heat treatment process(Results in Engineering, 2019) Adeleke, A.A; Ikubanni, P.P.; Orhadahwe, T.A; Aweda, J.O.; Odusote, J.K.; Agboola, O.O.This research was aimed at using image analysis to describe the effects of rapid cyclic heating on mild steel. AISI1021 steel sample used in this study was subjected to quenching heat treatment followed by 1, 2, 3, and 4-cycles of rapid heat treatment. The as-treated steel samples were characterized by Brinell hardness tests, Charpy Vnotch impact tests, optical microscopy, and image analysis using Image J software. The results revealed that the grain size decreased from 1.07 µm in the control sample to 0.79 µm in the third cycle sample and increased to 0.86 µm in the fourth cycle sample. However, the results revealed that two-cycles of rapid heat treatment was enough to produce ultra-fine grains and impact ductility in mild carbon steel.Item Physico – mechanical assessment of plaster of Paris bandage produced from locally sourced materials(Materials Research Society of India and Indian National Science Academy (Springer)., 2019) Adekola, F.A; Olosho, A.I; Adeleke, A.A; Eletta, O.A; Agaja, S.BDespite the abundance of gypsum and other material needed for the production of plaster of Paris (POP) in the country, Nigeria relies 1 heavily on the importation of orthopaedic POP bandage. Therefore, the present study aimed at producing POP bandage (LPOP) from locally sourced pure gypsum and cassava starch. Physico-chemical parameters such as amylose content, amylopectin content, water absorption capacity (WAC), swelling capacity (SC) and browning-charring temperature (BCT) were obtained for the starch binder. A slurry of pure gypsum powder and 2% gelatinized starch binder was impregnated on cotton gauze and cured in an oven at 180◦C for an hour to produce the LPOP. A comparative mechanical test was carried out on the LPOP and a POP bandage (CPOP) acquired from the market using a universal testing machine. The results showed that starch contains 9.06 mg/100 g amylose and 24.1 mg/100 g amylopectin which implied that it has a good binding property. The SC,WAC and BCT were evaluated to be 69.79%, 81.94% and 190◦C, respectively. The yielding tensile force for LPOP and CPOP are 148 and 460 N respectively. The horizontal compressive strength of the LPOP and CPOP are 1712 and 1595 N while the vertical compressive strengths are 1070 and 623 N respectively. These results show that the LPOP produced from locally sourced materials compete favourably in terms of mechanical properties with POP bandage in the market. Thus, based on its strength, it is recommended for orthopaedic casting.