Six local clays namely Bomo, Bukuru, Kankara, Manjahota, Onibode and Upkor were studied for use as wasteform for fixation of strontium ion in radioactive wastes. The clays were characterized with respect to cation exchange capacity, organic carbon content and crystal structure. Then the most relevant properties of c]ay wasteforms: shrinkage, densit... Continue Reading
At the moment, the Railway system in Nigeria is generally unreliable and inefficient. For instance, the journey time on Kaduna to Zaria rail link of 84 km takes 2 hours 15 minutes compared to 45 minutes by road. The problem is due largely to line related infrastructures and geometrical limitations of the route. Specific instances of speed restricti... Continue Reading
A soil sample which was identified as a weak material for stabilization with coment was used in testing the load carrying capacity of soilcrote specimens and the various affects on it. The stressstrain deformation pattern of soilcrote was also studied in addition to the effect of height-diameter ratio on the compressive strength of soilcrete cylind... Continue Reading
In the Refrigerating Industry, the frosting of refrigerating coils and its effect on heat transfer is a problem of obvious importance. Amount of frost on the evaporator is dependent on the ambient temperature and air humidity. The performance of any cold storage unit depends upon maintaining storage space and evaporator temperatures within a range ... Continue Reading
The feasibility of operating intermittent sand filters for upgrading the effluent parameters from waste stabilization pond was investigated. Samples of the effluent were colleeted from the outlet of the Waste Stabilization Pond of the Ahmadu Bello University Zaria (A.B.U.) and were subjected to sand filtration. The filter system, of which there wer... Continue Reading
The structural behaviour and ultimate strength of concrete slabs strengthened by epoxy-bonded steel plates was studied by both analytical and experimental investigations. The purpose was to evaluate their structural response at the serviceability and ultimate limit states. Simple analytical models that predict the ultimate behaviour of reinforced c... Continue Reading
Nigeria is a rapidly developing country with a very large construction programme. Fortunately it has considerable oil resources to provide funds for this development. However, the demand for amenities still exceeds the funds available so the development plans have to be carefully considered. To enable the plans to be drawn accurately it is necessar... Continue Reading
Simulation can be achieved by setting up a model, of a real situation (system) and then performing experiments on the model. It is widely used as a research and management tool in Engineering analysis, design and industry because of the complexity of agricultural systems. In this thesis, simulation models for stationary grain threshers were develop... Continue Reading
Catalyst support material was developed from Pindiga bentonitic clay using heat and acid treatment. Raw Pindiga elay was beneficiated using the wet method. The beneficiated clay was calcined at temperatures of 700�C, 750�C, and 800�C. Thereafter, the calcined clay samples were activated by acidifying with sulphuric acid, using wet acidification ... Continue Reading
Pavement Investigation or Evaluation is the study which provides information to the general investment and planning programme and maintenance phases of pavement management. It assesses the deficiencies and defects of existing sections of pavement thereby pinpointing the rehabilitation needs or otherwise. This case study centred on a selected major ... Continue Reading
A positive-displacement vane pump (pdvp) was designed, constructed and preliminary tests carried out on it in the phase I of this project. Also, the influence of clearances within the pump on the hydraulic efficiency of a pdvp was theoretically investigated in phase I, based on laminar flow within the clearances. The work in this thesis is an exten... Continue Reading
The journey to work had been the subject of several studies. Results from dome of these studies have been used to formulate models for use in travel demand forecasts. However, virtually all these studies have been carried out in the developed countries. Because of differences in environmental factors, one cannot arbitrarily adapt their findings for... Continue Reading
In highway pavement design, the main factors considered are the expected traffic, subgrade strength, and the constituent materials for the pavement structure. Associated with each of these factors, however, are elements of uncertainty. Ignoring these uncertainties, means that either high factors of safety are applied in design, with its cost implic... Continue Reading
The cost of steel rods and cement has become so high that it is becoming increasingly difficult for an average Nigerian to build reinforced concrete houses. Even though coarse aggregates could be got locally, the cost of production is also high. Thus, fewer houses are being erected nowadays. It will not augur well for the country if this trend is a... Continue Reading
This work assesses the feasibility and performance of an enhanced Unified Power Quality Conditioner (UPQC). A UPQC configuration has been developed which incorporates Photo voltaic (PV) cells and Battery Energy Storage System (BESS) in the DC link of the UPQC. The BESS is connected using a bi-directional DC-DC converter. The system operates in two ... Continue Reading