ABSTRACT Laterite is an eco-friendly construction material that has the ability of being re-cycled indefinitely. The research is aimed at achieving the effective utilization of laterite as a sustainable construction material by attempting to identify the best percentage of the soil stabilizers needed to improve the laterite. In this study, hydrated lime and bone ash were used as soil stabilizers to improve the strength of Nigerian laterite (obtained from Gosa and Sauka in Abuja, Nigeria). Co...
ABSTRACT The corrosion behavior of uncoated and cut-back bitumen coated X65 Steel samples are being investigated in environments of different pH (2, 3, 4 and 7). Immersion tests were carried out on the samples at 25ºC. The comparison of the corrosion behavior of uncoated, spray-coated and brush-coated X65 steel samples in the different pH media and temperature were observed using the weight measurements approach and visual examination. With 72 hours intervals in the weight measurement of th...
ABSTRACT This work studies the adsorption capacity of laterite and iron oxide nanoparticles for dissolved ions in solution and therefore its ability to reduce conductivity of mine waste effluent. Three laterite samples were prepared and used as adsorbents. The first laterite adsorbent was used without any treatment, the second was heat treated and the third was mixed with 15 % iron oxide nanoparticles of particle size 100 nm. Laterite and nanoparticle characterization, pH and adsorption test...
ABSTRACT This research presents the design, construction, and analysis of the performance of a mixed-mode solar dryer for crops. A mixed-mode solar dryer utilizes direct solar radiation from the sun as well as input heat ducted from the solar collector inlet which is directly connected to the dryer. Such dryers have been shown to outperform passive solar dryers as it was also shown in this work using drying kinetics. Tomatoes were dried in the drying chamber under the mixed-mode condition. T...
ABSTRACT Failure of offshore oil and gas pipelines occurs under certain conditions due to some applied mechanical forces. These conditions constitute a potential threat to the integrity of in-service life span of the pipelines which can lead to loss of resources and environmental pollution. Several studies have shown that pipelines fail as a result of Welding, Fatigue Crack Growth, Corrosion Fatigue, Stress Corrosion Cracking, and Erosion due to fluid flow. This paper presents a model by usi...
ABSTRACT Organic-inorganic perovskite photovoltaics (PVs) have attracted a lot of attention as highefficiency thin film PVs which are relatively cheap and easy to fabricate. Lead halide perovskites have shown a rapid rise in power conversion efficiency by 3.8 % in 2009 to 21.02 % in 2016. One major problem is that lead is toxic and poses a serious concern to health and the environment. The most likely substitute for lead is tin. Tin-based perovskite solar cells have shown good semiconducting...
Abstract The study explores the investigation of the chemical composition, microstructure and mechanical properties of steel and cement mortar used in reinforced concrete. The compositions and mechanical properties of the locally produced steel were analyzed to ascertain their potential for applications for construction. Two samples of construction steels produced and used in Nigeria were studied along. The chemical compositions of these steels were determined using Solaris CCD techniques. Th...
ABSTRACT Metals in service often give a superficial impression of permanence, but all except gold are chemically unstable in air and air-saturated water at ambient temperatures and most are also unstable in air-free water. Corrosion can be defined in general terms as the degradation of a material, usually a metal, or its properties because of a reaction with its environment. It results to damage cost between 1 – 5 % GNP as reported from different countries. Corrosion can be initiated by di...
Abstract Many building collapsed cases have been reported throughout the West African regions. It is recorded that during some of these subsidences, many lives are lost and the vast majority end up in hospitals and clinics with huge loss in investments also. This poses a major challenge to the health and wellbeing of the human race. Overwhelming facts of poor workmanship, engineering fault and poor maintenance have been highlighted as major factors. On the other hand, most research has shown...
ABSTRACT Investigations were carried out to determine the corrosion effect of sulphur-reducing bacteria on mild and medium carbon steels. Specimens were exposed to anaerobic, aerobic and distilled water environments. The corrosion rates were evaluated at intervals of seven days using weight loss and electro-chemical methods for a period of forty two days. The specimens were also subjected to visual examination and the result indicated uniform corrosion in all the environments. In all the env...
ABSTRACT Over the last two decades, several materials such as metals, polymers and composites have been used as implants in the body. Metallic implants have proven to cause stress shielding, toxic corrosion products and necessity for re-surgery. On the other hand, synthetic polymers possess poor stiffness and cause inflammation. The quest in making up for the disadvantages of these materials has culminated in a paradigm shift to the use of biodegradable and biocompatible polymers such as pol...
ABSTRACT Oil spills have been a major source of concern due its harmful effect on the environment. To reduce the effect of oil spills, new remediation strategies need to be developed whiles enhancing the efficiency of existing remediation ones. In this study, the potential of TiO2 and its modified form (Fe-TiO2) as a stand-alone or as an add-on remediation strategy was explored. This was carried out by accessing the how TiO2 and Fe-TiO2 photodegrades crude oil fractions (aromatics, paraffins,...
ABSTRACT Analytical and finite element models were used to simulate additive cold welding patterning processes. The effects of adhesion, pressure, thin film (layer) thickness and dust particle modulus (between the contacting surfaces) are examined. A simple model is developed and used to determine the contact profiles around impurities between cold-welded thin films. These are computed as a function of adhesion, particle modulus, and layer thickness. The models are shown to provide new insig...
ABSTRACT The number one killer disease in the world is Cardiovascular Disease1 . The most serious element of Cardiovascular Disease is Coronary Artery Disease. Currently, the main treatment for Coronary Artery Disease is stent placement surgery. However, its long time safety and efficiency are the major setbacks, as it is associated with late restenosis and late thrombosis. These are set caused by the durable polymeric film used as the drug carrier. To improve on the current treatment (stent...
ABSTRACT Binders are important components of electrodes of supercapacitors because of their ability to adhere active components and make the resultant slurry to adhere on current collectors. This work seeks to investigate the possibility of a bioactive polymer (chitosan) substituting the conventional fluoro-thermoplastic binders used in supercapacitors within the constraint of electrochemical characterizations. Chitosan based electrodes at 3% acetic acid concentration displayed the best elec...