Journal Articles

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End date: 2019Has files: Yes

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    PARTIAL REPLACEMENT OF FINE AGGREGATE WITH WASTE GLASS IN CONCRETE MADE FROM BIDA NATURAL AGGREGATE
    (3rd International Engineering Conference (IEC 2019) Federal University of Technology, Minna, Nigeria, 2019) Alhaji, B.; Kolo, D. N.; Abubakar, Mahmud; Yusuf, A.; Abdullahi, A.; Mohammed, S.
    This study reports the experimental investigation on the suitability of waste glass as partial replacement for fine aggregate in concrete made using Bida natural aggregates (BNA). Glass is widely used in our daily lives through manufactured products such as sheet glass, bottles, glassware, and vacuum tubing. It is an ideal material for recycling. The increasing awareness of glass recycling speeds up inspections on the use of waste glass with different forms in various fields. Mix ratio of 1:2:4 batched by weight with water – cement ratio of 0.55 was used. The percentage replacement varied from 0% to 40% at 5% intervals. Slump test was conducted to assess the workability of the fresh concrete. The compressive strengths and densities of cured concrete cubes of sizes 150mm x 150mm x 150mm were evaluated at 7, 21 and 28days. A total of 81 concrete cubes were cast and tested. It was observed that an increase in the percentage replacement of fine aggregate with waste glass reduces workability, density and compressive strength. The compressive strength and density vary with days of curing. The findings of this study indicated that the optimum replacement percentage of waste glass with conventional fine aggregate was 20%. However waste glass can effectively be used as fine aggregate replacement (up to 40%) without substantial change in concrete strength.
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    Development of an Android Based Mobile Application for Design and Detailing of Pad Foundations to BS8110
    (Epistemics in Science, Engineering and Technology, 2017) Yusuf, A.; Aminulai, H. O.; Abdullahi, A.; Abubakar, Mahmud; Alhaji, B.
    Many innovative computer software have been developed to perform the task of designing and detailing structural elements such as beams, columns, slabs and foundations. This design and detailing can be done using mobile devices but software developed to operate on such devices have not been fully developed. However, this research is aimed at developing an android based mobile application for the design of pad foundations to Bs8110. The mobile application developed designs isolated axially loaded-only; axially loaded with moment pad footings as well as combined pad footings. The mobile application developed was tested using three typical test parameters and results compared to the manual computations. There was no significant variation in the steel sections required and provided for the manual design and that generated by the mobile application. The steel required by manual design for the axially loaded pad footing was 835mm2/m and that generated by the application was 837.2mm2/m. That of the axially loaded with moment gave required steel section as 1019mm2/m using manual design. This android based mobile application would thus give the structural engineer the leverage to design pad footings anywhere and anytime.
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    COMPARATIVE ANALYSIS OF TRAFFIC PERFORMANCE OF SMALL AND LARGE CENTRAL ISLAND ROTARIES IN MINNA, NIGERIA
    (SAVAP International, 2013) Abubakar, Mahmud; Ndoke, P. N.
    Of recent, the government of Niger state has embarked on the construction of roundabouts with small central island rotaries; this paper compares the performance of large central island rotaries with small central island rotaries. The performance of large central island rotaries compares well to the performance of small central island rotaries. Capacities of rotaries with small islands were found to be higher than capacities of large central island rotaries while the delay for large central island rotaries was found to be higher than that of small central island rotaries. However, both large and small central island rotaries were found to be operating at the same level of service. This study provides recommendations to traffic engineers and/or planners on the conditions under which both central island rotaries perform better and, thus, should be considered.
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    DEVELOPMENT OF AN ANDROID BASED MOBILE APPLICATION FOR THE DESIGN AND DETAILING OF ISOLATED PAD FOUNDATIONS ACCORDING TO EUROCODE 2
    (i-manager’s Journal on Mobile Applications & Technologies, 2019) Yusuf, Abdulazeez; Isiaka, I.; Abubakar, Mahmud; Aminulai, H. O.; Abdullahi, Aliyu; Alayande, T. A.
    In a building construction project, it is the responsibility of the structural engineer to come up with a complete design of all structural elements. When this is done manually it is tasking, time consuming, and produces errors with inconsistent results. However, the design can be done using computer software, but this also comes with some downside; it is expensive and complex to use. Thus, this research developed an android based mobile application for the design of pad foundations to Eurocode 2 to put these challenges in check when designing pad footings. The mobile application designs isolated Axially loaded-only and Axially loaded with bending pad footing to Eurocode 2 accurately, with consistent results and in a timely manner. The application was tested using typical test parameters and results are compared to the manual computations. There was no significant difference in the steel sections provided for both methods. All checks that must be satisfactory in design were all checked and found to be satisfactory.
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    Probability based design of concrete mixes with cow-bone ash admixed cement
    (Leonardo Journal of Sciences, 2017) Abubakar, Mahmud; Mohammed Abdullahi; James Isiwu Aguwa
    A probability-based procedure for design of concrete mixes with cow-cone ash admixed cement has been developed considering the strength as a random variable. However, the compressive strength of concrete in turn, depends on the properties of its constituent materials: cement, fine aggregate, coarse aggregate and cow-bone ash. The compressive strength data generated experimentally has been analysed using normal-probability distribution functions based on 95% confidence interval. The proposed probability based design was compared to the method of trial mixture. It was observed that for reliability index (β) of 1.3, the proposed probability methodology uses 10.2% less cement content than the method of trial mixture; thus, indicating that the method is conservative. It was also observed that, for concrete grade 25, the proposed methodology gives higher compressive strength at both 7 and 28 days. Hence, the probability-based design procedure was found appropriate and is therefore recommended for the design of concrete mixes with cow-bone ash admixed cement.
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    Comparative Assessment of Macroscopic Traffic Flow Properties Estimation Methods: A Case for Moving Car Observer Method
    (ENGINEERING SCIENCE AND TECHNOLOGY INTERNATIONAL RESEARCH JOURNAL, 2017) Hassan Shuiabu Abdulrahman; A. A. Almusawi; Abubakar, Mahmud
    Different methods of estimating macroscopic traffic properties is expected to have varying results even when they are carried out on the same road and during the same time interval. A comparative assessment was carried out between traffic data collected at a point and that collected over a short section; Moving car observer method(MCO). Student’s t-test was used to evaluate both data and it was observed that there was no significant difference between them. The MCO method correlates well with conventional data collection method and it can be used as a substitute for it, assuming conventional data collection method is true
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    A Remote-Sensing Based Assessment of Seasonal Variation in Vegetation Quality and Productivity in Nimbia Forest
    (Civil and Environmental Research, 2015) Ifeanyi C. Onuigbo, Joseph O. Odumosu, Ekundayo. A. Adesina, Nanpon. Zitta, Oluibukun G. Ajayi, Abdullahi A. Kuta
    Agriculture plays a vital role in the growth and sustainability of developing countries, such as those in sub-Saharan Africa. Therefore, there is a need to monitor and assess the changes taking place in vegetation quality and productivity. The conventional ground survey method has proved to be highly tedious, laborious, and grossly limited, especially when large and densely forested regions are concerned. This paper presents a remote sensing-based approach as a real-time technology to determine the effect and extent of water loss caused by seasons on vegetation quality in Nimbia forest, Kaduna State. ENVI 4.7, ArcGIS 10.0, and Global Mapper Software were used, and a discrepancy of about 45% in the quality of vegetation has been observed between seasons in the region under study.
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    Evaluation of the various orthometric height systems and the Nigerian scenario – A case study of Lagos State
    (Journal of King Saud University – Engineering Sciences, 2015-09-12) J.O. Odumosu, O.G. Ajayi, F.F. Idowu, E.A. Adesina
    Though considered the easiest in 3-Dimensional Point Positioning, the choice of a height system, especially in areas with spatially vast land mass, is rather a complicated choice. Orthometric heights are naturally and fully referenced to the actual Earth gravity field, but laborious to compute considering the required approximations of gravity variation along the plumb line from the surface to the geoid. Normal heights, on the other hand, are less laborious to compute and do not require actual gravity observations. Unfortunately, natural height systems are the only systems that can efficiently predict fluid flows. This paper has therefore examined the theory and practical possibility of replacing the use of Helmert Orthometric Heights with Normal Orthometric Heights within Lagos State. A maximum height discrepancy of 1 mm was obtained in the comparison of both systems, and thus their replaceability was found suitable to within 3rd-order geodetic accuracy.
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    Using a GIS-Based Network Analysis to Determine Urban Greenspace Accessibility for Different Socio-Economic Groups, Specifically Related to Deprivation in Leicester, UK
    (Civil and Environmental Research, 2014) Abdullahi Ahmed Kuta, Joseph Olayemi Odumosu, Oluibukun Gbenga Ajayi, Nanpon Zitta, Hassan A. Samail-Ija, Ekundayo. A. Adesina
    Accessibility to green space by different socio-economic groups, specifically related to deprivation in the English city of Leicester, was done using Geographical Information System (GIS) network analysis. The result was compared with the ANGSt standard, which provided the benchmark for assessing green space in the UK. The result shows that a greater percentage of socio-economically deprived groups in Leicester lack access to green space within 300m of their homes. For distances of 2000m and 5000m, 70% have access. This work has explored the use of GIS network analysis to assess the accessibility of greenspace among socio-economically deprived groups, which will help those saddled with the responsibility of providing greenspace in carrying out their duties to ensure equity. This analysis can be extended to other groups in Leicester, e.g., the handicapped, elderly, etc, to assess how accessible Greenspace is to them.
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    Optimal Location Determination of Some Public Facilities within Minna Metropolis: A Geospatial Technique Approach
    (Journal of Geographic Information System, 2015-12-30) Abdulkareem A. Umar, Matthew O. Adepoju, Ekundayo A. Adesina, Michael O. Bamgbose
    Theoretical frameworks used to explain the location of services include central place theory, aspects of industrial location theory, and spatial diffusion theory. They are all described as normative theories that optimize concerning defined criteria operating in prescribed environmental conditions (Rushton, 1979). However, recent advancement in geospatial technologies has led to several applications in geographically orientated challenges, hence, the adoption of an effective decision tool like Geographic Information System (GIS), high resolution products of satellite remote sensing as well as the Global Positioning System (GPS) in solving the rather challenging task of optimal location for facilities concerning necessary criteria. Minna metropolis is being affected adversely by the problem of the appropriate location of public facilities. These facilities are either too far from their market zone or are too congested in a particular location, and in some cases, political considerations to the siting of these facilities without considering the necessary criteria for demands and public interest. The study is an investigation into the “optimal determination of the locations of some public facilities in the Minna metropolis of Niger State, using geospatial techniques”. The fusion of remote sensing, geographic information systems (GIS), and GPS techniques was explored. The geodata base of existing facilities was created, and Euclidean-distance geometry is used to spatially analyze the appropriate locations about the set of standard criteria. The results showed the haphazard and uncontrolled pattern of development of school locations. However, petrol stations met the evaluated criteria and optimal location indexes.