Browsing by Author "Jimoh, A. A."
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Item A Central Composite Design Method for Design of Mixture Proportion for a Laterite-cement Bricks(Epistemics in Science Engineering & Technology, 2017) Jimoh, A. A.; Alao, T. O.An attempt is made in this paper to present a guideline to produce laterite cement bricks meeting a user-defined requirement. Using the Central Composite Design (CCD) of the Response Surface Methodology of experimental design, a response prediction for a three component mixture for building bricks production using water, cement and laterite with percentage sand replacement was carried out. Five blends of bricks were investigated with cement content ranging between 8-20 percent by weight of laterite and 0-20 percent sand replacements. The machine mixing, compaction using Hydraform Twin-M7 machine and curing were carried out in a controlled laboratory environment. At the specified ages of 7 and 28 days, the compressive strength of bricks was measured and responses were modeled as a second-order quadratic model. Guidelines for the development of constraint formulation for mixture proportioning and optimization formulation were carried out. An inverse relationship for response prediction for strength was obtained and compressive strength achievable ranges between 7.46 - 18.85N/mm2. Two analytical techniques, using the Genetic Algorithm (GA) stochastic search technique, and an analytical method were presented with examples and were found adaptable computationally, to obtain response prediction, satisfying the user-defined constraints of strength, cost and durability.Item CHARACTERISATION AND GRADING OF TWO SELECTED TIMBER SPECIES GROWN IN KWARA STATE NIGERIA(FACULTY OF ENGINEERING , UNIVERSITY OF NIGERIA, NSUKKA, 2017) Jimoh, A. A.; Aina, S. T.This study investigates the physical and mechanical properties of two timber species for structural use. Three logs of each specie were obtained at different areas of Kwara State, of Nigeria which is located north in the periphery of the south-western rain forest area, sliced into 2” by 12” size before seasoning naturally and their structural/strength properties were determined at a moisture content of 18%. These logs were cut into test samples for the determination of their properties. A total of 351 samples (45 samples for each test) free from visible defects was used for each specie. Basic physical properties of the samples like moisture content, specific gravity and density was determined. Tensile strength, modulus of rupture, modulus of elasticity, compression, shear and hardness were the mechanical tests carried out according to BS 373 (1957), CP112 (1971), NCP2 (1973), EC5 (1995) and BS 5268 (2002) specifications on Universal Testing Machine (UTM). Results were analysed statistically using Analysis of Variance (ANOVA). A. Indica was graded into strength class D40 while X. Aethiopica was grade into strength class D70.Item Comparative Analysis of Recycled Waste Plastic Tiles and Alumina Ceramic Tiles with ANSYS 15(Epistemics in Science Engineering & Technology, 2017) Jimoh, A. A.; Tazou, O. L.; Kimeng, H. T.; Rahmon, R. O.This research illustrates and compares the analytical and behaviour of recycled waste plastic tiles and a conventional alumina ceramic tile. The melting point adopted for all waste plastic material was 60oC with a controlled cooling temperature method. The flexural strength and compression strength of the various plastic type used were conducted with a universal testing machine and these laboratory results were then used to simulate the recycled plastic tiles which were compared with those of alumina ceramic tile. A recycled waste plastic tile of 300 x 300 x 10mm was analysed with a central load for all recycled waste plastic types and were compared with those of alumina ceramic tile. The stresses, strain, deformations and force reactions were observed for all recycled waste plastic types and the alumina ceramic tile analysed. The results obtained from the analysis of the plates (tiles) specimen made of various recycled waste plastic was seen to have maximum deformations of 1.7499, 1.7445, 1.7242, 1.7499 and 1.556mm for water sachets, water bags, water bottles, polythene bags and alumina ceramic tile respectively and other parameters were also obtained. Also, the maximum use temperature for the various recycled waste plastic types were compared with that of the alumina ceramic tile.Item A COMPARATIVE STUDY OF THE PHYSICAL AND MECHANICAL PROPERTIES OF COARSE AGGREGATES PRODUCED IN OGUN STATE(FACULTY OF ENGINEERING , UNIVERSITY OF NIGERIA, NSUKKA, 2018) Omopariola ;, S. S.; Jimoh, A. A.This study investigates the compliance of the physical and mechanical properties of granites produced in some parts of Ogun State to relevant codes and standards. The desire to carry out the study was borne by personal on – site experience that single size aggregates produced in some parts of Ogun State do not conform to grading requirements specified in relevant codes and standards. Samples of 9.5mm, 12.5mm, 19mm and 25mm aggregates were collected from four different quarry sites spread across the state. The Samples were tested for their Specific Gravities, Water Absorptions, Moisture Contents, Aggregates Impact Value and Aggregates Crushing Value in accordance to the relevant standards. Test results reveals that all the samples conform to relevant codes and standards. It was therefore concluded that although the aggregates do not conform to grading specification but the physical and mechanical properties of all the aggregates meet the specifications in relevant codes and standards.Item Compressive Strength of Commercial Sandcrete Blocks Produced in Wudil and Warawa Local Government Areas Kano State, Nigeria(Ahmadu Bello University Press Limited, Zaria, 2013-06) Ma’aruf, A.; Jimoh, A. A.Item DETERMINATION OF OPTIMUM BURNING TIME AND SILICA COMPOSITION OF RICE (Oryza sativa) HUSK ASH AND GUINEA-CORN (Sorghum bicolor) HUSK ASH FOR POZZOLANA PRODUCTION(Chemical Society of Nigeria, 2017-02-01) Jimoh, A. A.; Ameen, O. M.; Atolagbe, J. AThe quest for production of cheap construction cementing material from agricultural wastes, particularly the ones with high silica content, formed the basis of this study. The process of determining the silicious material and silica content was carried out on two agricultural waste husk types, the Rice (Oryza sativa)husk and Guinea corn(Sorghum bicolor) husk to produce rice husk ash (RHA) and guinea corn husk ash (GCHA) respectively. Both husks were burnt separately in a furnace at 650 oC to produce the ash. The ash physical, chemical and cementitious properties were investigated. The particle size range of the ash was between 0.063 and 0.25mm while the silica content were 70.6 % and 79.1 % for both the RHA and GCHA respectively, at burning time of 6 hours. Their respective ash cementing property was tested by mixing their ashes with varying proportion of lime and water to form paste. The hardened paste 28th day compressive strength was 3.0 N/mm2. In comparison with common mortar, the ashes can be applied for plastering activities and block beddings.Item MICROSTRUCTURAL CHARACTERISATION, PHYSICAL AND CHEMICAL PROPERTIES OF RICE HUSK ASH AS VIABLE POZZOLAN IN BUILDING MATERIAL: A CASE STUDY OF SOME NIGERIAN GROWN RICE VARIETIES(FACULTY OF ENGINEERING , UNIVERSITY OF NIGERIA, NSUKKA, 2018) Abiodun, Y. O.; Jimoh, A. A.Recycling of agricultural wastes such as rice husk ash as pozzolan is being increasingly encouraged, particularly in developing countries. In this paper, preliminary investigation on the physical and chemical compositions of rice husk ash using different techniques was carried out. Scanning Electron Microscopy (SEM) images of the rice husk ash showed residual pores to be distributed within the ash sample, indicating that the silica is a highly porous material with a large internal surface area. Samples burnt at 4000C for 6 hours and 6000C for 4 hours for ‘Bukus’ and ‘Soro/ Olomo nla’ show aggregates with clearly defined layers of loose flakes compared to ‘Faro 58’. The Energy dispersive x-ray spectroscopy (EDX) analysis of rice husk ash performed to determine percentages of silica present in the samples were graphically represented. Nine elements (Al, Si, K, Ca, Br, Fe, Mg, Na, Mn) and their corresponding oxides (Al2O3, SiO2, K2O, CaO, Br, Fe2O3, MgO, Na2O, MnO) were detected with varying concentrations. The three varieties, on the average possess good silica content of over 50% considering the two varied temperature and time. Therefore, the chemical analysis results show that burning at combustion temperature of 6000C for 4hrs, gives optimal result than at 4000C for 6hrs because all the samples show high Silica content (Faro 58; 61.9, Bukus; 62.6 and Soro/Olomo nla; 59.5)Item Reliability-Based Investigation on Compressive Strength Characteristics of Structural-Sized Iroko (Meliceae Excelsa) and Mahogany (Khaya Ivorensis) Timber Column Found in Nigeria(Pouyan Press, 2018) Jimoh, A. A.; Rahmon and, R. O.; AJIDE, S. O.This research work examined the reliability of the Nigerian grown Iroko and Mahogany timber species as column materials. The strength and physical properties of these timber species were determined to predict the suitability of the species as a structural material. Forty lengths of timber species of 50mm x 50mm cross-section were purchased from timber market in Ilorin, Nigeria. The prevailing environmental conditions during the test were 31oC and 64% relative humidity. The properties tested included; air dry density, moisture content, and compressive strength parallel to the grain of forty test specimens each of lengths, 200, 400, 600 and 800mm done in accordance with the British Standard BS 373(1957). Mean air-dried moisture content for Iroko and Mahogany were 12.09 and 14.81% respectively. Mean density of Iroko and Mahogany were 500.8 and 830.1kg/m3 respectively. The derived continuous equations for the design of Iroko column and Mahogany column are 𝜎=37.552𝑒−0.005𝜆 and 𝜎=37.125𝑒−0.007𝜆 respectively. The results of the reliability analysis show that Iroko and Mahogany timber species have reliability index of 0.64 and 0.65 for a service life of 50 years, assuming other serviceability conditions are met. This design procedure is distinct and more effective than the usual procedure of classifying compression members as short, intermediate and long using their slenderness ratios.Item A Review of Smart Grids Deployment Issues in Developing Countries.(Published by Faculty of Engineering, University of Maiduguri, Maiduguri, Nigeria., 2017) Otuoze, A. O.; Usman, A. M.; Mohammed, O.O.; Jimoh, A. A.Item Sizing of Wind Powered Axial Flux Permanent Magnet Alternator Using Analytical Approach.(Published by University of Nigeria Press Ltd, University of Nigeria, Nsukka., 2016) Otuoze, A. O.; Oladapo, O.O.; Mohammed, O.O.; Jimoh, A. A.; Olaiya, B. S.Item STRENGTH CHARACTERISICS OF APA (afzelia bipindensis) TIMBER FOR STRUCTURAL USE (A CASE STUDY OF SPECIES GROWN IN KWARA STATE, NIGERIA)(WEBSJOURNAL OF SCIENCE AND ENGINEERING APPLICATION, 2016) Jimoh, A. A.; Yahya, I. A.; Adefem, J. B.This paper presents the results of experimental tests carried out on Apa (Afzelia bipindensis) to ascertain its structural performance. Fresh samples of Apa timber (Afzelia bipindensis) was collected from forest in Ajase Ipo town, in Irepodun Local Government Area of Kwara State, Nigeria. A log of Apa timber was obtained, air dried and 324 test specimens were prepared for strength properties determination. The strength characteristics tested were tensile, compression and bending parallel to grain alignment. The strength characteristics tests were conducted in accordance with BS 373. The mean and confidence limit were obtained through statistical analysis of the data obtained. The Tensile, Bending, Compressive, Modulus of Elasticity and Modulus of Rupture values of 26.90, 50.66, 2.58, 9274.62 ((N/mm2) respectively were recorded at 18% moisture content. In comparison with other structurally viable timber, it was concluded that Apa timber (Afzelia bipindensis) is more structurally adaptable and reliable.Item VARIATION IN THE PHYSICO–MECHANICAL PROPERTIES OF GRANITIC AGGREGATES IN OGUN STATE, NIGERIA(FACULTY OF ENGINEERING , UNIVERSITY OF NIGERIA, NSUKKA, 2018) Omopariola, S. S.; Jimoh, A. A.Coarse aggregate is an essential constituent of concrete constituting about 60% to 80% of concrete depending on the mix ratio. Granite is reported to be the most widely distributed plutonic rock in the earth crust. It is predominantly available in various parts of Ogun State of Nigeria. Its different properties have been known to strongly influence the fresh and hardened state properties of concrete. In this study, samples of four different sizes of granites (9.5mm, 12.5mm, 19mm and 25mm) were obtained from four different quarry sites across the state. The Physical properties such as specific gravity, moisture content and water absorption and the Mechanical properties such as aggregate impact value and aggregate crushing value of the samples were evaluated. The results of the specific gravity, moisture content and water absorption vary from 2.61 to 2.86, 0.69 to 1.22%, 0.16 to 2.13% respectively. While the aggregate impact value and aggregate crushing value vary from 18.30 to 28.12% and 6.21 to 9.45% respectively. It was therefore concluded that there are variations in the physical and mechanical properties of granites produced in Ogun State of Nigeria. The observed variations occur in relation to the various sizes and for the different quarry sites.