LAUTECH Journal of Engineering and Technology <p>LAUTECH Journal of Engineering and Technology (LAUJET) is a leading internationally referred journal in the fields of science, engineering and technology. It is a journal founded by academicians, educationists with substantive experience in industry. The journal is an online open access journal with a yearly print version of its volumes/issues made available to interested persons/institutions. The basic aim of the journal is to promote innovative ideas in fields relating to the sciences, engineering and technology. The basic notion of having a wide area of focus is to encourage multidisciplinary research efforts and seamless integration of diverse ideas that might be gleaned from the papers published in the journal.</p> <p>&nbsp;</p> Faculty of Engineering and Technology, Ladoke Akintola University of Technology, Ogbomoso, Nigeria en-US LAUTECH Journal of Engineering and Technology 1597-0000 THE STUDY OF ELECTRICAL AND MECHANICAL PROPERTIES OF MONTMORILLONITE CLAY POLYESTER NANO-COMPOSITE <p>Montmorillonite clay polyester nano composite were successfully prepared by melt insertion method at 5wt%, 10wt%, 15wt%, 20wt% and 25wt% of Montmorillonite clay. The electrical and mechanical properties of the produced composites were studied. Five specimens for each test was analysed. Results obtained indicates that while a drastic decrease in the impact energy of 100 was observed, the maximum tensile strength and young’s modulus values of 50.27 MPa and 8.7 GPa respectively were obtained at 10% filler concentration. The compressive strength increases by 48% and 100% at 15wt% and 20wt% filler concentration respectively. An increase in dielectric strength ( 100%) and capacitance (32%) of the samples with each filler addition of up to 25% with 3 times increase in hardness at 25wt%. was observed.</p> S. G. Borisade O. A. Oyelaran O. M. Sanusi ##submission.copyrightStatement## 2021-08-20 2021-08-20 15 2 1 9 THE EFFECT OF DISSOLVED PLASTIC POLYMER MODIFICATION ON RUTTING AND FATIGUE RESISTANCE PROPERTIES OF WARM BITUMEN BLEND <p>Recently, large amounts of waste polymers are being generated in Nigeria. One of the waste polymers is plastic bottles. Hot Mix Asphalt (HMA) are produced at high temperatures with high energy consumption and environmental hazard. The purpose of using Warm Mix Asphalt (WMA) is to reduce the production and laying temperature and emission of greenhouse gases. Therefore, this research investigated the effect of Dissolved Plastic Bottle (DPB) on the rheological, rutting and fatigue resistance properties of warm bitumen blend thereby reducing the environmental hazard associated with the Waste Plastic Bottles (WPB) disposal and consequently improving pavement service life. WPB was obtained from different waste generation points in Adeleke University, Ede, Nigeria. The obtained WPB was shredded and converted to dissolved form using pyrolysis machine @ 4500C. 500g of 60/70 penetration grade bitumen was heated in an oven with 3% (15g) sasobit until it becomes fluidal. The bitumen was modified with 0 - 17% by weight of the bitumen at 2% interval. Mixing was continued for 1hour to produce homogenous bituminous mixtures. Rheological tests were then conducted on the prepared samples using the Brookfield programmable rheometer. The results indicated that addition of DPB improves the rheological properties of absolute viscosity, phase angle, complex shear modulus, rutting and fatigue resistance of modified binder at both 135°C and 165°C. Therefore, DPB can be used to improve bitumen rheological properties and subsequently resist rutting and fatigue on traffic roads. This can best be achieved upon 7% and 5% modification levels at 135°C and 165°C respectively.</p> M. T. Akinleye L. O. Salami F. A. Oginni J. A. Alomaja G. O. Oluokun O. P. Joseph ##submission.copyrightStatement## 2021-08-20 2021-08-20 15 2 20 26 DESIGN AND FABRICATION OF COMBINED ELECTROMAGNETIC AND MAGNETIC DRUM-BELT CONVEYOR SEPARATOR <p>Mineral processing operations are faced with many challenges which include effective separation of unwanted materials generated through the extraction process from the bulk material. Magnetic device is a machine used for separating magnetic materials from non-magnetic materials by inducing the magnetic flux. Magnetic and electromagnetic separators are widely used as primary separation equipment. This work was centred on the design and construction of a laboratory-sized dual purpose magnetic and electromagnetic separator for separating the magnetic particles from the rest of the bulk mineral or ferrous materials from foundry sand in a single system. The main components of the equipment include: the hopper, conveyor belt rotating drums, pulley and belt, electromagnet. The approaches to achieving the result reported include the design conceptualization, design calculation, design drawing using the AutoCAD and Inventor software, fabrication and assembly of components. The evaluation showed that electromagnetic separation is more efficient than magnetic separation. The equipment was fabricated at an average cost of 224,000:00 naira</p> O. O. Ajibola A. O. Adebayo S. G. Borisade H. T. Oladimeji E. Oluwalana M. P. Daramola A. E. Adeleke D. O. Omoyeni ##submission.copyrightStatement## 2021-08-20 2021-08-20 15 2 49 59 POWER SYSTEMS OPERATION IMPROVEMENT CONSIDERING LOSS MINIMIZATION AND VOLTAGE STABILITY ENHANCEMENT <p>The challenge of energy and power losses during electrical energy transmission from generation plants to users is a major problem that cannot be over-emphasized. These Losses are inevitable because they are inherent in the conduction of electrical energy through physical means but can be minimized. This paper presents a VSC-PSO method for optimizing the power system operation by simultaneously minimizing the loss and enhancing the voltage stability which are the objective functions. The optimal power flow (OPF) was performed on IEEE 30-bus system with Newton Raphson algorithm implemented in MATLAB simulation software. The simulation results showed that the VSC-PSO approach performed more excellently with concurrent consideration of line loss reduction and voltage stability improvement when compared with other methods in literature</p> A. P. Adeagbo E. O. Ofoegbu O. B. Adewuyi O. G. Chizube T. J. Toluwani ##submission.copyrightStatement## 2021-08-20 2021-08-20 15 2 41 48