Publication

Publisher:
 ProLigno International Journal In The Field Of Wood Engineering
Publication Type:
 Journal
Publication Title:
 Effect Of Density On The Natural Resistance Of Ten Selected Nigerian Wood Species Subterranean Termites’ Attack
Publication Authors:
 Owoyemi, J.M., Olaniran, O.S., And Aliyu D.
Year Published:
 2013
Abstract:
The effect of density on the natural resistance of selected Nigerian wood species to subterranean termites was investigated. Wood samples obtained from mixedconversion boards were used such that the samples contained both sapwood and the heartwood. They were sawn to 35x35x450mm stake and dried at 103±2°C till a constant weight was achieved. Density of the selected wood species was determined. Based on the observed average density, the wood species were classified into high, medium or low density. Graveyard test method was used to assess the natural resistance of the samples on a site dominated by Macrotermes sybhylinus, a family of subterranean termites. Weekly visual observations of the stake were taken as specified in ASTM D334580 Standards for 24 weeks. The wood samples were withdrawn at the 24th weeks of exposure to termites and weight loss due to termites’ attack was estimated. Result obtained showed the relationship between wood density, weight loss and the ASTM ratings. A strong but negative correlation (R2 = 0.70) existed between weight loss and wood density while as strong positive correlation (R2 = 0.83) existed between ASTM values and wood density. These results indicated that wood species in the high density class had a better resistance to termite’s attack. The influence of mixed conversion on the resistance of wood species to subterranean termites was also reported, since it is the most common method of conversion in the Nigerian sawmills. The sapwood of high density species are not durable as revealed in the study thus the preservative treatment is imperative for long service life. 
Publisher:
 International Journal Of Chemical, Material Science And Engineering
Publication Type:
 Journal
Publication Title:
 Suitability Of Newsprint And Kraft Paper As Materials For Cement Bonded Ceiling Board
Publication Authors:
 Owoyemi J.M. And Ogunrinde O.S.
Year Published:
 2015
Abstract:
The suitability of Newsprint and Kraft papers for the production of cement bonded ceiling board was investigated. Sample boards were produced form newsprint paper (100%), mixture of newsprint and Kraft paper (50:50) and Kraft paper (100%) at 1:1, 2:1 and 3:1 cement/ paper mixing ratio respectively with 3% additive concentration of calcium chloride (CaCl2). Density, flexural and thickness swelling properties of the boards were investigated. The effects of paper type and mixing ratio on the physical and mechanical properties were also examines. The bending properties of the board which include Modulus of Elasticity (MOE) and Modulus of Rupture (MOR) increased linearly with increase in density. Modulus of Rupture of boards increased as the density and mixing ratio increased. The thickness swelling property for the two paper types decreased as the board density and mixing ratio increased. Boards made from Kraft paper recorded higher strength values than the ones made from recycled newsprint paper while the mixture of Kraft and newsprint papers had the best surface finish. The result of the study will help in managing the large quantity of waste from paper converting/ carton industry and that the ceiling boards produced could be installed with clout nails or used with suspended ceiling fittings. 
Publisher:
 Journal Of Sustainable Environmental Management
Publication Type:
 Journal
Publication Title:
 Chain Sawmilling: Implications On Nigerian Forest
Publication Authors:
 Owoyemi J.M., Falemara B.C. And Omolola O.R.
Year Published:
 2013
Abstract:
Chainsaw is a major mechanical harvesting tool used in tree felling and adapted for log conversion which involves insitu cutting of logs into timber. The trees are felled, topped, delimbed, cross cut and then processed into timber. In recent times, its use has gone beyond the traditional felling and now commonly used for log conversion in the forest. This development has generated a lot of controversies in some states in Nigeria. While some states outrightly banned its use, others condone it. This paper examines the practice of chainsaw milling and its implications for the future of Nigerian forests. Root causes of illegal chainsaw milling activities as well as environmental concerns were also discussed. Illegal chainsaw lumbering is reported to be destructive to the forest resource base and yield low timber volume recovery. While this practice provides affordable cheap timber supply and also generate employment for rural people. The practice of chainsaw milling should be regulated and operators made to conform to the provisions of the law to stem the spate of indiscriminate exploitation of the forest and loss of revenue for the government. 
Publisher:
 International Journal Of Biological Sciences And Applications
Publication Type:
 Journal
Publication Title:
 Natural Resistance Of Ten Selected Nigerian Wood Species To Subterranean Termites’ Attack
Publication Authors:
 Owoyemi J.M. And Olaniran O.S.
Year Published:
 2014
Abstract:
Natural resistance of some wood species used prominently in the Nigerian construction industries to termite was examined in this study. Wood samples were collected from a Sawmill in Akure and cut to stakes of 35x35x450 mm which were to be buried half way in the soil. Their density was determined and classified across the three density classes: high, medium and low. They were exposed to subterranean termites attack for 48 weeks (12months) in a termitarium. Monthly visual estimation of the stakes was done in accordance with ASTM D 3345/t980 rating scale and gravimetric weight loss assessment carried out after 6 and 12 months of exposure. Results showed that there was significant difference (p 
Publisher:
 Applied Tropical Agriculture
Publication Type:
 Journal
Publication Title:
 Assessment Of The Differences In Drying Rates Of Open Air And Shed Methods Using Three Selected Nigerian Wood Species
Publication Authors:
 Aladejana J.T., Owoyemi J.M. And Olufemi B.
Year Published:
 2014
Abstract:
Differences in drying rated of open air and shed methods using three selected Nigerian wood species was examined. The samples of the three wood species; (Brachystegia eurycoma, Trichilia emetica and Cordia millenii) were collected form freshly sawn logs form a sawmill in Akure Nigeria for evaluation. They were processed into 300mm (length) x 100 mm (breadth) x 100 mm (thickness) blocks weight and stacked in each of the drying medium for rate of drying assessment. The results of the study indicated that Brachystegia eurycoma dried form 41% and 40.5% to 24.4% and 20.8%, Trichilia emetic dried from 38.5% and 36.5% to 19.1%s and 18.3% while Cordia milenii dried form 38% and 37.9% to 17% and 16% respectively for open air and shed methods after 21 days of drying. The density of the wood species as obtained from literature influenced the drying rate. There was significant difference (p 
Publisher:
 ProLingo International Journal In The Field Of Wood Engineering
Publication Type:
 Journal
Publication Title:
 Strength And Sorption Properties Of Bamboo (Bambusa Vulgaris) WoodPlastic Composites
Publication Authors:
 Babajide C.F., Ajayi B. And Owoyemi J.M.
Year Published:
 2015
Abstract:
The study investigated the strength and water sorption properties of plastic composites produced from the sawdust of bamboo and recycled Low Density Polyethylene (LDPE). Three levels of board density (500kg/m3, 600kg/m3 and 700kg/m3) and three levels of plastic/ fibre mixing ratio (1:1, 2:1 and 3:1) were adopted. The thickness swelling (TS), water absorption (WA), tensile strength, modulus of elasticity (MOE) and modulus of rupture (MOR) were investigated. The sorption properties were measured after 24hour watersoak test exposure. The mean values of the properties ranged from 4.15% to 1.40% for thickness swelling; 31.96% to 4/83% for water absorption; and 2.55Mpa to 6.98Mpa, 5564.11Mpa to 10771.65Mpa and 0.60Mpa to 4.2Mpa for tensile strength, modulus of elasticity and modulus of rupture respectively. The result revealed that as the plastic/ fibre mixing ratio and board density increased the tensile strength, MOE and MOR increased, while TS and WA decreased. Strength properties of composite boards produced with the higher production variables had higher strength properties and decreased sorption assessment. Bamboo particles are suitable for the manufacturing of Wood Plastic Composites (WPC) using LDPE. 
Publisher:
 Nigerian Journal Of Sustainable Environmental Management.
Publication Type:
 Journal
Publication Title:
 Assessment Of PhysicoMechanical Properties Of Borassus Aethiopum Mart; A Lesser UsedSpecies
Publication Authors:
 Owoyemi J.M., Oyebiyi B.C. And Ogunrinde O.S.
Year Published:
 2015
Abstract:
The dwindling supply of timber from the natural forest has necessitated the need to examine the properties of lesserused species to determine their suitability for structural applications. Studies were carried out on the physical and mechanical properties of Borassus aethiopum mart grown in Iwo Local Government, Osun State, Nigeria. Three stands of Borassus aethiopum were felled and bulked at 25, 50, and 75% points with samples obtained from outer and inner portions to determine the property variations. Bending test was carried out to determine the modulus of elasticity (MOE) and modulus of rupture (MOR) of the wood. The result showed that the density of the tree species ranged from 514.71 ± 1.53/kg/m3 to 620.00 ±5.90 kg/m3 with the outer base portion recording the highest value and the top inner portion had he least density value. Moisture content of the freshly felled B. aethiopum varied from 30.32±6.47% to 118.18± 5.34%. Findings also revealed that the base outer portion had the least shrinkage value of 8.47±4.25% whereas the top inner portion had the highest mean shrinkage value of 10.33±5.39%. For volumetric swelling, base outer portion had the highest mean value. The mechanical properties result obtained revealed that MOE value ranged from 514.65±58.07 N/mm2 to 9276.59 ±78.20 N/mm2 with the outer base portion had the highest value and the inner top portion had the least mean value. For MOR, values ranged from 23.13±41.89 N/mm2 to 83.15+65.55 N/mm2. The results obtained showed that Borassus aethiopum can be used as timber for structural applications in construction companies. 
Publisher:
 Applied Tropical Agriculture.
Publication Type:
 Journal
Publication Title:
 Threshold Determination For Chromated Copper Arsenate And Creosote Oil For Termiticidal Treatment Of Gmelina Arborea Wood
Publication Authors:
 Owoyemi J.M. And Olufemi B.
Year Published:
 2015
Abstract:
The threshold point of Chromated Copper Arsenate (CCA) and Creosote Oil preservatives for the treatment of Gmelina arborea wood against subterranean termites was investigated. Wood samples from 15 years old Gmelina arborea trees were colddipped with CCA at 4%, 3% and 2% concentration levels while Creosote Oil was used undiluted as well as at 1:1 and 1:3 creosote oilkerosene mixtures. The treated samples and control were exposed to termite attack at the timber grave yard, Federal University of Technology, Akure Nigeria for 36 months. The result revealed the efficacy of CCA in the protection of Gmelina wood at three concentration levels for 36 months. The result revealed the efficacy of CCA in the protection of Gmelina wood at three concentration levels for the 36month period with samples maintaining and ASTM mean visual rating of 10 (sound) at 2,3 and 4% CCA treatment levels. Creosote oil provided protection for only 12 months period as it recorded heavy attack and failure at the end of 30 months thereby suggesting a posttreatment schedule every 12 months for the undiluted creosote oil in order to sustain protection of the wood. It could be concluded that 3% concentration level is the threshold value for CCA wood treatment while creosote oil could only be used undiluted for 12 months; its dilution with solvent reduced its potency. 
Publisher:
 Key Engineering Materials
Publication Type:
 Journal
Publication Title:
 Assessment Of Inorganic Bonded Paperboards Produced From Kraft And Recycled Newsprint
Publication Authors:
 Owoyemi J.M., Ajayi, B. And Ogunrinde O.S.
Year Published:
 2016
Abstract:
Homogeneous cement bonded paperboards were made with recycled newsprints and Kraft paper with ordinary Portland cement and curing reagent. Boards were produced at the blending proportions of 100:0, 50:50 and 0:100 respectively and at cement/paper ratio of 1:1, 2:1 and 3:1 respectively. Dimensional movements were evaluated to investigate the effect of the variables used in board manufacturing before and after exposure to accelerated aging test procedure. Increase in mixing ratio and blending proportion caused decrease in Thickness Swelling (TS) and Water Absorption (WA) while TS and WA of the untreated boards were lower than the accelerated aging treated boards. The dimensional movement of Kraft paper was higher than that of recycled newsprint before and after accelerated aging treatment. The strongest and most dimensionally stable board was produced at the highest level of cement/ paper ratio. The preaccelerated ageing test carried out showed that mechanical properties were higher 2: 1and 3: 1 paper cement mixing ratios. Kraft paper produced the strongest and most dimensionally stable board than: recycled newsprint. From this study Kraft paper and recycled newsprint proved to be suitable for the manufacture of cement bonded paperboard capable of meeting the needs in core and low cost housing construction. 
Publisher:
 ISROSETInternational Journal Of Scientific Research In Multidisciplinary Studies
Publication Type:
 Journal
Publication Title:
 Management Of Nigerian Forest Through Efficient Recovery Of Harvesting Residues
Publication Authors:
 Ogunrinde Olayemi Segun And Owoyemi Jacob Mayowa
Year Published:
 2016
Abstract:
Harvesting residue poses a lot of problem especially to the waste management authorities in Nigeria and as a disturbance to forest floors since it is not being used appropriately. Large quantity of wood waste is generated daily in harvesting and some other forest management operations which run into millions of Naira if recycled or properly used. This paper focused on wood harvesting practices, sources of harvesting residue, the percentage recovery and their potentials for future usage in other to be able to manage the forest sustainably. Available resources on this subject were critically reviewed. Findings revealed that large quantity of wood harvesting residue generated could be used for energy production, ceiling boards, Charcoal production, fuel wood, briquette and Pharmacognosis. This provides solution to increasing deforestation caused by overexploitation of the forest due to increasing demand for forest products thereby reducing pressure on the forest. It is evident however that not all forest industries, particularly in developing countries currently use harvesting and wood residues efficiently for energy.