Browsing by Author "I. O. Ohijeagbon"

Now showing 1 - 3 of 3

Development and characterization of wood-polypropylene plastic-cement composite board
(Elsevier, 2020-05-16) I. O. Ohijeagbon; Peter Pelumi Ikubanni; Adekunle Akanni Adeleke; Adekunle Akanni Adeleke; Vincent T. Mustapha; John A. Olorunmaiye; Imhade P. Okokpujie
The utilization of agricultural residues and industrial wastes such as plastics to complement the use of solid wood in the manufacturing of composite panels presents an effective and efficient way of waste management for sustainable utilization of resources, especially in developing countries. Thus, the present study aimed at developing a cheap, safe, and energy-efﬁcient composite board for effective house partitioning from sawdust and polypropylene plastic using cement and expanded polystyrene (EPS). Composite boards were developed from the blend of sawdust and polypropylene plastic using cement and expanded polystyrene (EPS) as adhesives. The composite boards were made by varying the sawdust-polypropylene ratio as well as the cement-EPS ratio. A constant load of 0.2 MPa was used in compacting the materials in a prepared aluminum mold under a hydraulic press machine. Physico-mechanical properties of the composite board such as density, water absorption, moisture content, compressive strength, tensile strength and flexural strengths were evaluated. The density of the composite boards varied from 490 to 630 kg/m3. The moisture content ranged from 6.04 to 9.09% while the water absorption ranged from 30 to 80% after 2 and 24 h immersion. The highest flexural, tensile and compressive strength for the composite boards were 7.10, 1.52, and 3.72 MPa, respectively. The composite samples met all the requirements of a partitioning wall except for flexural strength based on IS3087 standard. Cement and EPS were found to be suitable as adhesive for the development of composite boards from sawdust and polypropylene.
Development of Methodology for Characterization of Surface Roughness of Solid Metallic Surfaces Using Oil Slippage Method
(Sciendo, 2021-08-12) I. O. Ohijeagbon; Adekunle Akanni Adeleke; Peter Pelumi Ikubanni; T. A. Orhadahwe; G. E. Adebayo; A. S. Adekunle; A. O. Omotosho
The study employed the phenomenon of friction between liquid droplets and solid metallic surfaces in surface roughness analysis of engineering materials. Five samples of mild steel plate were prepared to different degrees of surface roughness by facing operation. The sample surfaces were analysed to determine the roughness parameters (mean roughness, root mean square roughness, roughness skewness, and roughness kurtosis) and friction coefficient of the surfaces. Oil droplet sliding velocity was determined using the oil slippage test. The friction coefficient of the surfaces increased with increasing roughness parameter which varied from 26.334 µm at friction coefficient = 0.63 to 13.153 µm at friction coefficient = 0.46. The results from oil slippage test showed that the sliding velocity of the oil drop decreased as the friction coefficient of samples increased. At an inclination angle of 30°, sliding velocity varied from 0.51 cm/s at friction coefficient = 0.63 to 0.92 cm/s at friction coefficient = 0.46. Some of the samples exhibited a deviation in the trend of relationship between friction coefficient and sliding velocity which resulted from the variation in peak height of roughness between the sample surfaces. Oil slippage method predicts the surface behaviours of materials based on their surface parameters.
Physico-mechanical properties of cement bonded ceiling board developed from teak and African locust bean tree wood residue
(Elsevier, 2021-02-17) I. O. Ohijeagbon; M.U. Bello-Ochende; Adekunle Akanni Adeleke; Peter Pelumi Ikubanni; A.A. Samuel; O. A. Lasode; O. D. Atoyebi
Over the years, the pursuit for locally sourced economical and environmentally safe materials has been on the increase in the development of composite boards. These locally sourced materials are organic materials from plants and livestock such as wood residue, feathers, rice husk, maize husk and bamboo fiber. Therefore, this study utilizes species of wood residue in the development composite ceiling boards. Ceiling boards were developed from teak and African locust bean tree wood residue using cement as a binder. The ceiling boards were made by varying the composite mass of the mix and mixing ratio of wood dust to cement. A constant load of 5 kN was used for the compaction process using a hydraulic pressing machine. Physico-mechanical properties of the ceiling boards such as moisture content, density, water absorption, drying shrinkage, tensile strength, and compressive strength were evaluated. The percentage of moisture content were 9.50 and 14.50% for teak and African locust bean tree wood dust, respectively. The values of density varied from 0.56 − 0.68 g/cm3. The water absorption ranged from 9.0 to 39.8% after 24 h immersion and drying shrinkage ranged from 8.60 to 35%. The maximum impact energy obtained is 98 J. The highest tensile, compressive and flexural strengths for the ceiling boards were 1.09, 0.82, and 0.56 MPa, respectively. The composite samples showed that ceiling boards made from teak wood dust is most suitable for interior use. Cement was found to be suitable as a binder for the development of ceiling boards.