Browsing by Author "Jimoh, A.A."
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Item Adsorption Study of Utilizing Calabash (crescentia cujete) Seed in the Removal of Heavy Metals from Industrial Wastewater(2018-02) Amigun, A.T.; Jamiu, W.; Adebayo, G.B.; Jimoh, A.A.This work was carried out to assess the physicochemical parameters and removal of heavy metals from industrial wastewater by activated carbon prepared from calabash seed. Some physicochemical parameters of the wastewater that assessed are pH, temperature, and turbidity, BOD, COD, TS, TDS and TSS. Adsorption studies on the effects of contact time, pH and adsorbent doses on the removal of heavy metals were investigated. The pH and temperature of granite industrial wastewater were 7.5 and 32.5 respectively which are within the permissible limit of WHO (7-8.5 and 32 oC). The wastewater sample shows extremely high turbidity of 2.5 mg/l, biochemical oxygen demand (BOD) of 430 mg/l, chemical oxygen demand (COD) of 283 mg/l, total solid (TS) of 45 mg/l, total dissolved solid (TDS) of 655 mg/l and total suspended solid (TSS) of 965 which are above permissible limit of WHO. The maximum adsorption capacity of Zn (99%) and Fe (88%) were observed at pH 8 and 12 respectively. The pseudo-fist order and pseudo-second order kinetic models were used to fit the kinetic data of the adsorption process, and the result obtained showed that pseudo-second order kinetic model was able to fit the generated adsorption data from the heavy metals considered in this research work due to the regression coefficient R2 of 0.997 value obtained. The study reveals that granite industrial wastewater effluent is one of the industries responsible for polluting the surrounding aquatic environment.Item Application of fanpalm (borassus aethiopum) Stem as Water Tower(Department of Civil Engineering, University of Ilorin, Ilorin, Nigeria, 2010) Jimoh, A.A.Item Assessment of types and significant causes of building defects in University of Ilorin, Ilorin, Nigeria(Department of Civil Engineering, University of Ilorin, Ilorin, Nigeria, 2017) Lawal, A.R.; Jimoh, M.O.; Jimoh, A.A.Cases of building collapse in Nigeria has been on the increase since the turn of the millennium. Yet, it has been observed that most of these buildings do not just give way and fail; they first show symptoms of distresses in the form of defects. It can be said that defects in buildings constitute undesirable challenges and threats to users. Thus, investigation studies were carried out in University of Ilorin on some of its buildings, so as to determine the types and major causes of defects with a view to ultimately suggest appropriate reducing measures. The research was divided into qualitative strategy which served to reveal physical extent, and quantitative strategy which helped to gather factual data and study the relationship between how such facts accord with findings and research of past literatures. Case study survey and questionnaire survey were used. While the former helped to present the frequency of defects as actually obtainable, the latter method of assignment provided the perception levels of study respondents (clients, consultants, contractors and end users) on defects in University of Ilorin buildings. Findings thus reveal that active cracks (>1.5mm wide) on beams, columns, slabs and walls are the most frequent type, while improperly sloped roof gutters are the least frequent type. Also, workmanship error accounted for the most probable cause of 70% of the type of defects, while defective material accounted for the most probable cause of 30% of the types of defects.Item Behaviour of Fan-Palm Reinforced Concrete One-Way Slabs Subjected to Flexural Loading(Bentil Books Ghana, 1993-07-27) Jimoh, A.A.; Adetifa, O.A.Behaviour of Subjected toItem Calibration and application of a low Cost Electrical Technique for Measuring Strain(FACULTY OF ENGINEERING & TECHNOLOGY, UNIVERSITY OF ILORIN, 2004) Jimoh, A.A.Item CHARACTERISATION AND GRADING OF THREE SELECTED TIMBER SPECIES GROWN IN KWARA STATE NIGERIA ACCORDING TO EN 338 (2009) FOR STRUCTURAL USE(FACULTY OF ENGINEERING , UNIVERSITY OF NIGERIA, NSUKKA, 2018) Jimoh, A.A.; Ibitolu, B.J.This paper is aimed at classifying three potential timbers grown in Nigeria using EN338 (2009) strength classification for structural size specimen. The timbers namely Vitex doniana, Ceiba pentandra and Pseudocedrela kotschyi were obtained in Ilorin, Kwara State of Nigeria. Physical and Mechanical properties of the selected timber species were determined in accordance with EN 13183-1 (2002) and EN 408 (2003) for structural timbers. Four point bending tests based on EN 408 (2003) with specimen 50x50x1000 mm were carried out using a Universal Testing Machine (UTM) to determine the bending strength and Modulus of Elasticity of the each timber specie. Characterisitc values of Bending strength, Modulus of Rupture and Density were determined using EN 384(2004). The timber species; Vitex doniana, Ceiba pentandra and Pseudocedrela kotschyi had equilibrium moisture content (EMC) of 15.70%, 13.71 % and 24.28 % respectively. Strength grading of timber species was then conducted by adjusting the material properties values of species to 12 % moisture content using the required adjustment factors. The timber were then graded according to EN338 (2009). Pseudocedrela kotschyi had the highest density of 813 kg/m3 followed by Vitex doniana (706 kg/m3) while Ceiba pentandra had the lowest density of 402 kg/m3. Vitex doniana, ceiba pentandra and Pseudocedrela kotschyi were assigned to strength class D30, C16 and D35 respectively in accordance with EN338(2004).Item Characterization and grading of some potential Nigerian Timbers species in accordance to Eurocode EN 338 (2009)(School of Engineering & Engineering Technology Federal University of Technology Minna, Nigeria, 2017) Ibitolu, B.J.; Jimoh, A.A.Item Compressive Strength Characteristics of Ara and Apado Nigerian Timber Species . Ethiopian Journal of Science and Sustainable Development. 6(2); 1-7, Published by Adama Science & Technology University, Ethiopia.(Ethiopian Journal of Science and Sustainable Development. Adama Science & Technology University, Ethiopia., 2019) Jimoh, A.A.; Rahmon, R.OThe paper examined the reliability of the Nigerian grown Ara and Apadotimber species as column materials. The work focuseson the compressive strength characteristics of Nigerian Ara (Pterocarpus erinaceus) and Apado (Berlinia spp)timber column of nominal lengths 200, 400, 600 and 800 mm and cross section of 50 by 50 mm. The steps involved include collection and conditioning of Apa and Apado timber species, preparation of test specimens, determination of physical and compressive strength properties and derivation of continuous column design equations. Twenty (20) test samples were used for all the tests carried out. Apa and Apado have an average density of 652.83and 732.56 kg/m3,respectively. Moisture content of both speciesisless than the maximum recommended value of 20 % and the average strength at yield of Apa and Apado were 38.81and 29.61 N/mm2. The derived continuous equations for design of Apa and Apado column are σ=47.882−0.009λand σ=17.211−0.007λrespectively. Ara and Apado have the reliability index of 0.63 and 0.65 respectively for a service life of 50years, assuming other serviceability conditions are met.The paper therefore recommends the adoption of these equations for the design of compression members from these timber species, in NigeriaItem A continuous column design formula at ultimate strength for axially loaded Iroko(Milicia excelsa) Timber column(Faculty of Science University of Ilorin, 2007) Jimoh, A.A.Item Dam Design Against Water Induced Vibration(National Centre for Hydro power Research and Development, 2009) Jimoh, A.A.Item Design equation for Ayin (Anogeissus leioparpus) Timber beam at ultimate loading capacity(JAST Foundation Accra Ghana, 2008) Jimoh, A.A.Item Design formula at ultimate stresses for Ekki (Lophira alata) timber beam, Journal of Computational Engineering and Physical Modeling,(Published by Pouyan Press, Iran. Available at: http://www.jcepm.com/article_96018.html, 2019) Jimoh, A.A.The global pursuance of design method for economic utilization of building material is the basis of this study. The ultimate stress design method proposed in this study is in line with this pursuit as it encourages full utilization of material section and thus brings in economy in material application. This is the focus of this study on appropriate design procedure for Ekki (Lophira alata ) timber beam. This new method can replace the conventional design which is based only on modulus of rupture that has been reported not a rational method because it relies only on the extreme thin fibre tensile strength of the beam in flexure, whereas, for such a beam, it is subjected to both tension stress (below the neutral axis ) and compression stress (above the neutral axis). Based on this fact, the method generated two stress expressions, one for axial tension and the other for axial compression, represented by their typical stress-strain equations for loaded Ekki specimens. To develop the beam design equations, the axial typical stress-strain equations were converted to bending expressions of the stress-neutral axis depth relationships for the Ekki beam section. These relationships were further simplified and tested to give theoretical results that compare well with the experimental values.Item Determination of Optimum Burning Time & Silica Composition of Rice (Oryza sativa) Husk Ash and Guinea Corn (Sorghum bicolor) Husk Ash for Pozzolana Production(Journal of Chemical Society of Nigeria, 2017) Jimoh, A.A.; Ameen, O.M.; Atolagbe, J.A.Item DEVELOPMENT OF STRENGTH CLASSES FOR TWO SELECTED NIGERIAN TIMBER SPECIES BASED ON BS 5268:2002 AND NCP2:1973(WEBSJOURNAL OF SCIENCE AND ENGINEERING APPLICATION, 2018) Jimoh, A.A.; Fatolu, A.S.; Rahmon, R.O.; Babatunde, O.Y.Broad range of research works have been carried out over the past few years and these have resulted in comprehensive information on materials properties of various species of timber in Nigeria. There is still research gap to cover many useful but unpopular timber species, therefore this research work is meant at characterising two commonly used timber species in Nigeria; Isoberlinia doka (Babo/Doka) and Anogeissus leiocarpus (Ayin) for structural use as well as comparing their properties with other known timber species. The logs of wood used were obtained from Irewolede Sawmill, from where tests specimen were prepared in accordance with BS 373:1957. A total of 240 test specimens were prepared from the timber species and Laboratory tests were carried out on these specimens using 100 kN Universal Testing Machine (UTM) at the National Centre for Agricultural Mechanization (NCAM), Ajase Ipo Road, Ilorin, Kwara State, to determine some of the physical and mechanical properties of the timber species. The strength properties tested includes: bending strength (MOR), modulus of elasticity (MOE), tensile strength, shear strength, compression strength (both parallel and perpendicular to grain) and cleavage strength while the physical properties tested include moisture content, specific gravity, and density. The results obtained show that the timber species are hardwood of higher strength classes (between strength classes D30 – D70) when compared with BS 5268:2002 whereas, Ayin is stronger than Babo timber species according to NCP 2:1973.Item Effect of the Blend of Cement - Sorghum Waste Ash (Sorghum Vulgare) on the Flexural Strength Properties of Concrete(Department of Civil Engineering, University of Ilorin, Ilorin, Nigeria, 2018) Tuleun, L.Z.; Jimoh, A.A.The continuous depletion of lime stone deposits during cement production is increasingly posing a challenge in the construction industry. Other disadvantage associated with cement production includes CO2 emission into the atmosphere and its negative effect on global warming. As a result, the research was geared towards at proffering alternatives to use of cement with impairing on the overall performance of concrete. Investigating the effect of Sorghum waste ash (SWA) - ordinary Portland cement blends on the flexural strength properties of concrete formed the bases for this study. Ordinary Portland cement was partially replaced with sorghum waste ash at an interval of 5, 10, 15 and 20 %. A water-cement ratio and mix ratio of 0.61 and 1:1.5:3.2 were adopted respectively. Chemical analysis test carried out on the ash sample was done in accordance with ASTM C618 (1999). Sorghum waste ash had silica content of 74 %, which was above the minimum of 50% specified in ASTM C618 (1999) for any material to be classified as a pozzolan. Twenty five beam specimens of size of 100 × 100 × 500 mm were cast and test for flexural strength after 28 days curing period. This was done in accordance with BS EN 12390-1(2000). Validation of experimental results was done using ANSYS 15.1 finite element software. A peak flexural strength of 6.079 N/mm2 was gotten at 10 % cement level with ash. The strength result of plain concrete was 7.304 N/mm2.Item Evaluation of Buckling Characteristics of Structural-Size Pycnanthus angolensis and Vitex doniana as Timber Column Under Compression(University Politehnica Timisoara, Faculty of Engineering Hunedoara, Romania . Available at: http://acta.fih.upt.ro/pdf/2019-4/ACTA-2019-4-20.pdf, 2019) Jimoh, A.A.; Rahmon, R.OStructural reliability was examined on the lesser-used timber species such as Akomu (Pycnanthus angolensis) and Eriri (Vitex doniana) which can be good substitute to the well-known species. The strength and physical properties of these timber species were determined to predict their suitability as structural material. Forty lengths of timber species of 50 x 50 mm cross-section were purchased from timber markets in Ilorin, Kwara State, Nigeria. The prevailing environmental conditions during the test were 31 oC and 64 % relative humidity. The properties tested were air dry density, moisture content and compressive strength parallel to grain of forty test specimens each of lengths, 200, 400, 600 and 800 mm in accordance with the British Standard BS 373 (1957). Mean air-dried moisture content for Akomu and Eriri were 11.12 and 13.29 %, respectively. Mean density of Akomu and Eriri were 644.58 and 889.84 kg/m3, respectively. The typical derived equations to relate the stress and strain for Akomu and Eriri were y= 1097.8x − 2.9858 and y = 1033.7x − 2.5309, respectively. Results of reliability analysis show that Akomu and Eriri timber have reliability index of 0.68 and 0.63, respectively for a service life of 50 years, provided other serviceability conditions are met.Item Investigation into the Pozzolanic Effect of Brewers Dry Grain Ash (Sorghum Vulgare) as Partial Replacement of Cement in Concrete Production(Epistemics in Science Engineering & Technology, 2017) Tuleun ; ; ;, L.Z.; Jimoh, A.A.; Ozigi, P.B.; Rahmon, R.O.The production of cement, one of the major binders in the construction industry has adverse effect on the environment, contributes to global warming, and leads to depletion of limestone. On the other hand, burning of Brewer dry grain (BDG) in the open pollutes the atmosphere with attendant health consequences. To overcome the adverse effect associated with cement production and the burning of waste material, the use Brewer dry grain ash (BDGA) as partial replacement of cement in concrete production was investigated. Cement was partially replaced with BDGA at 5 %, 10 %, 15 % and 20 % in concrete. A water-cement ratio and mix ratio of 0.61 and 1:1.5:3.2 was adopted. Chemical analysis test on the ash sample was carried out in accordance with ASTM C618 (1999). The consistency, initial and final setting time test was carried out in accordance with BS EN 196-3 (1994). Eighty-five cubes of the size of 150 ×150×150 mm were cast and tested for compressive strength at 7, 14, 28 and 56 days curing. The test was carried out in accordance with BS EN 12390-1(2000). For tensile strength test, twenty-five specimens of size 100 × 100 × 200 mm were cast and tested after 28 days curing. This test was carried out in accordance with ASTM C 496-11. BDGA had a silica content of 74%, which was above the minimum of 50 % specified in ASTM C618 (1999) for any material to be classified as a pozzolan. An increase in setting time was observed with BDGA addition. A maximum compressive strength of 36.4 MPa was attained at 10 % cement replacement with BDGA ash, and the result obtained was higher than the strength of plain concrete by 25.6 %. For tensile strength, a maximum compressive strength of 3.03 was obtained at 10% replacement. This was higher than the strength of plain concrete by 13.5 %.Item INVESTIGATION OF COMPRESSIVE STRENGTH CHARACTERISTICS OF STRUCTURAL-SIZED ARERE (Triplochiton scleroxylon) AND EMI (Vitellaria paradoxa ) TIMBER COLUMNS GROWN IN NIGERIA(Adama Science & Technology University, Ethiopia. Available online at: https://ejssd.astu.edu.et/index.php/EJSSD/article/view/96/35, 2019) Jimoh, A.A.; Rahmon, R.OStructural reliability was examined on the lesser-used species such as Arere (Triplochiton scleroxylon) and Emi (Vitellaria paradoxa) which can be good substitute to the well-known species. The strength and physical properties of these timber species were determined to predict the suitability of the species as structural material. Twenty lengths of timber species of 50 x 50 mm 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 grain of twenty (20) test specimens each of lengths, 200, 400, 600 and 800 mm done in accordance with the British Standard BS 373 (1957). Mean air-dried moisture content for Arere and Emi were 14.48 and 15.89 % respectively. Mean density of Arere and Emi were 514.32 and 1147.75 kg/m3 respectively. The reliability index of Arere and Emi timber species are 0.64 and 0.65 respectively for a service life of 50 years, assuming all other design conditions are met.Item LABORATORY EVALUATION OF THE PERFORMANCE OF CALCIUM CARBIDE WASTE (HYDRATE LIME) IN CONCRETE(WEBSJOURNAL OF SCIENCE AND ENGINEERING APPLICATION, 2018) Tuleun, L.Z.; Jimoh, A.A.The disposal of Calcium carbide waste can lead to groundwater contamination via leaching. Also, the production of Portland is increasingly having an effect on global warming and the continuous depletion of limestone deposits. With the aim of minimizing the negative effects associated with the production of cement and disposal of calcium carbide waste, physical and mechanical properties of Calcium carbide waste (CCW) – Ordinary Portland Cement (OPC) in concrete was investigated. Consistency test, initial and final setting time test, compressive, tensile and flexural strength test was carried out on CCW-OPC concrete. OPC was replaced with CCW at 5, 10, 15 and 20 %. A mixed ratio and water-cement ratio of 0.61 and 1: 1.5: 3.2 was adopted for a conventional grade of 20MPa. Eighty five cubes of size of 150 × 150 × 150mm were cast and tested for compressive strength after 7, 14, 28 ,and 56 days curing. Thirty cylindrical specimens of size 100 × 200 were cast and tested for tensile strength after 28 days curing. For flexural strength test, thirty rectangular beam specimens of size 100 × 100 × 500 mm were cast and tested after 28 days curing. Results of initial and final setting time decreased with CCW addition. Results obtained for compressive strength showed a decrement with CCW addition. The optimum compressive strength of 34.3 MPa was obtained at 5 % replacement, which was greater than the strength of plain concrete by 19.9 %. Partial replacement of cement with CCW in concrete led to a decrease in tensile strength. Maximum flexural strength was attained at 15 % cement replacement. A maximum strength of 7.856 MPa obtained was greater the strength of plain concrete (7.304 MPa).Item Local Materials: Thermal Transmission Characteristics and Models for Single and Double Panels Timber Walls(Department of Civil Engineering, University of Ilorin, Ilorin, Nigeria, 2007) Jimoh, A.A.: and