AGRICULTURAL & ENVIRONMENTAL ENGINEERING
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Item The design, construction and testing of a wooden silo for grain storage(The Nigerian Society of Engineers, 1996-03) Lucas, E. B.; Mijinyawa, Y.A hexagonal, double-walled, wooden silo of sides 1.2m, height 1.8m and of 7m3 capacity was designed. The walls and floor were taken as stressed skin panels. These were fabricated using Mansonia altissima for the ribs, while exterior grade structural plywood was used as sheathing. The silo was subjected to nondestructive testing in accordance with the British Standard Code of Practice CP: 112 and joints separation, consolidation movement of the foundation and floor deflection were periodically measured over a period of two weeks during which the structure was under load. At the end of the test period there was no measurable consolidation movement and the joints remained intact while the floor deflection was within permissible limit of ∆ ≤ L/180. Further testing and evaluation including subjecting the silo to loading for longer duration and taking measurements of stresses induced on the silo components are to be undertaken.Item Comparative studies of temperature fluctuations within wooden and steel silos in Ibadan(The Nigerian Society of Engineers, 1997-12) Lucas, E. B.; Mijinyawa, Y.Temperature fluctuations and moisture condensation within the interiors of a steel and wooden silos were determined experimentally. The steel silo is of 1mm thickness while the wooden silo is a two-layered wall panel of 12mm and 6mm thick plywood separated by 50mm air-gap. Measurements taken during the hotter months of March and April in Ibadan showed that temperature fluctuations in the steel and wooden silos were 9°C and 7°C respectively. Corresponding maximum temperature in the silos were 38.5°C and 37.2°C. While the interior of the wooden silo remained dry, the steel silo had condensed moisture droplets lining its inner walls. Since moisture condensation in a silo contributes to grain spoilage by biological agents, wooden silos are rated superior in respect of reducing this adverse feature.