scholarly works
Permanent URI for this collectionhttps://repository.ui.edu.ng/handle/123456789/458
Browse
2 results
Search Results
Item Effects of process variables on the strength properties of veneer laminated cement bonded particle board from mixed tropical hardwoods(1999) Omole, A. O.; Badejo, S. O. O.Modulus of Rupture (MOR) and Modulus of Elasticity (MOE) of veneer laminated wood cement panel were evaluated. The boards were made of 3 layers comprising 1.5 mm thick mixed hardwoods sawdust for the two surfaces, and 9mm thick core layer made of plantation grown Gmelina arboma flakes. Three variables were investigated namely: Density at three levels (1000 kg/m3, 1100kg/m3 and 1200 kg/m3), Cement wood ratios of 2.5:1.0, 2.75:1.0 and 3.0:1.0 and glue spread of 1.02 kg/m2, 1.43 kg/m2 and 1,74 kg/m2 double due line (DGL) for the boards lamination. For all the treatment combinations, the MOR ranged from 26.79 N/mm to 42.59 N/mm2 while for MOE, the mean value was in the range of 3114N/mm2 to 5310N/mm2. At board density level of 1250 kg/m3 the laminated panels gave value of the highest MOR and MOE. Statistical analysis showed that the three variables considered in this study had significant on the board strength.Item Senna siamea (LAM) and its potential for protective forestry(1999) Oluwadare, A. O.; Omole, A. O.There is problem of desertification worldwide. It is most prevailing in the northern part of Nigeria where the scanty vegetation cover is being destroyed daily for firewood. Firewood problem has been identified as one of problems contributing to land degradation. There is need to plant suitable species with good calorific (fuel) value which in turn will improve the soil as well as ameliorate the encroachment of desert. Senna siemea wood samples were collected from the University of Ibadan plantation. The fuel value was determined using ballistic bomb calorimeter. Twenty trees of the same age were assessed. The mean fuel value for wood and bark were 22275kj/kg and 20961kj/kg respectively. The highest radial value was found near the pith with mean value of 23312.47kj/kg and the least toward the bark (21299. 26kj/kg). Mean tree height and diameter at breast height were 14.20m and 21.68cm respectively. Based on this performance, Senna siamea is being proposed as a suitable species for reforestation, protective forestry in soil conservation, reclaiming denuded areas and for firewood plantation.