Publication

Publisher:
 International Journal Of Scientific Research In Multidisciplinary Studies
Publication Type:
 Journal
Publication Title:
 Accelerated Aging Assessment Of Cement Bonded Board Produced From Gmelina Arborea (Roxb.) Strand And Sawdust
Publication Authors:
 Owoyemi J.M. And Ogunrinde O.S.
Year Published:
 2016
Abstract:
Durability, toughness, dimensional stability and resistance to termites attack are problems of materials used in construction. Environmental effect such as weathering also affect the performance of cementbonded composite materials. This study examined the physical and mechanical properties of cement bonded board produced from Gmelina arborea (Roxb.) strand and sawdust. Three levels of mixing ratios of cement wood material 1:1, 2:1 and 3:1 and five levels of material blending proportion of strand of sawdust of 100:0, 75:25, 50:50, 25:75 and 0:100 were adopted for the board formation. Assessment of the water absorption, thickness swelling and modulus of rupture, modulus of elasticity. 
Publisher:
 ISROSETInternational Journal Of Scientific Research In Multidisciplinary Studies
Publication Type:
 Journal
Publication Title:
 Sustainable 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 is 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 literatures 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. 
Publisher:
 Environmental And Socioeconomic Studies.
Publication Type:
 Journal
Publication Title:
 Sustainable Wood Waste Management In Nigeria
Publication Authors:
 Owoyemi J.M., Habeeb O. Z. And Isa O.E.
Year Published:
 2016
Abstract:
Wood industries produce large volumes of residues which must be utilized, marketed or properly disposed of. Heaps of wood residues are common features in wood industries throughout the year. In Nigeria, this residue is generally regarded as waste and this has led to open burning practices, dumping in water bodies or dumping in an open area which constitutes environmental pollution. Sawmills in Nigeria generated over 1,000,000 m3 of wood waste in 2010, while about 5000 m3 of waste was generated in plywood mills. Nigeria generates about 1.8 million tons of sawdust annually and 5.2 million tons of wood wastes. The impact of improper disposal of waste wood on the environment affects both the aquatic and terrestrial ecosystems. Also burning of waste wood releases greenhouse gases into the atmosphere causing various health issues. Reuse/recycling of these wood residues in Nigeria will reduce the pressure on our ever decreasing forests, reduce environmental pollution, create wealth and employment The literature available on this subject was reviewed and this article, therefore, focuses on the various methods of wood waste disposal and its utilization in Nigerian wood industries, the effects of wood waste on the environment as well as on human health and the benefits of proper wood waste management practices. 
Publisher:
 Applied Journal Of Tropical Agriculture FUTA.
Publication Type:
 Journal
Publication Title:
 Effect Of Thermal Treatment On Physical And Mechanical Properties Of Hevea Brasiliensis (Rubber) Wood
Publication Authors:
 Owoyemi J.M. And Iyiola E.A.
Year Published:
 2016
Abstract:
One of the major problems of wood in service is dimensional stability caused by absorption of moisture from humid environment: Recent effort has been on using nonchemical treatment to enhance wood serviceable life. Therefore, this study examined the influence of thermal treatment on the physical and mechanical properties of Hevea brasiliensis wood. The wood samples were selected from the top, middle and base of rubber trees, ovendried to a moisture content of 12% before thermal modification in a muffle furnace at varying temperature of' 160°C, 180°C and 200°C.for 30: 60and 90minutes duration. Mean values for water absorption ranged from 54.55% (160°C for 30 min) to 49.34% (200°C for 90min) The Modulus of Rupture values varied from 87.22N/mm2 at 160°C to 66.87N/mm2 at 200°C. Increase in treatment time from 30 minutes to 60 minutes caused a decrease in the MOR from 86.98N/mm2 at 30 minutes to 73.23N/mm2 at 60 minutes. There were significant difference in the results obtained with thermally treated wood at 200°C and 90 minutes with improvement in resistance of rubber wood to moisture and decrease in mechanical properties especially the modulus of rupture. The result showed that thermal treatment could improve the resistance of the wood to moisture absorption and enhanced mechanical properties of the treated wood. 
Publisher:
 Modern Environmental Science And Engineering Journal.
Publication Type:
 Journal
Publication Title:
 Physicomechanical Properties Of Thermally Modified Gmelina Arborea Wood
Publication Authors:
 Owoyemi J.M., Adebayo H.H. And Aladejana J.T.
Year Published:
 2016
Abstract:
The major problem of wood in service is dimensional instability caused by varying relative humidity of the surrounding environment. This study investigated the effect of thermal modification 011 the physical and mechanical properties of Gmelina arborea wood. Freshly felled Gmelina arborea trees were machined and trimmed to standard size of 20x20x60 mm for the determination of physical properties (colour, volumetric shrinkage, swelling and water absorption) and· 20x20x300 mm for mechanical properties (Modulus of Rupture and Modulus of Elasticity) assessment. Thermal modifications were performed in several batches using 160, l80, and 200C at 1, 2 and 3 hours. Visual observation of treated samples showed that wood colour changed from light yellowish to very dark brown with increasing treatment temperature. Water absorption, shrinkage and swelling values decreased with increase in treatment duration and temperature. At a treatment time of 3hrs, compared with the control, mean values of the thermally treated samples for volumetric swelling ranged from 2.65% at l60°C to l.94% at 200°C. Mean values of the thermally treated samples for volumetric shrinkage ranged from 6.58% at 160°C to 3.65% at 200°C. Mean values of the thermally treated samples for water absorption ranged from 33.40% at I 60°C to 26.8% at 200°C. The MOE of heat treated Gmelina arborea wood varied from 4012.25 N/mm2 at l60°C to1245.87N/mm2 at 180C. The MOR varied from 38.30N/mm2 at 200C to100.91N/mm2 at 160C. MOR was significantly reduced while there were no significant effects on the MOE as a result of heat treatment. The result showed reduction in the hygroscopic properties of Gmelina arborea wood making it suitable for use in high moisture prone areas in construction. 
Publisher:
 Biomedical Statistics And Informatics
Publication Type:
 Journal
Publication Title:
 Noise Pollution And Control In Mechanical Processing Wood Industries
Publication Authors:
 Owoyemi J.M., Falemara B.C. And Owoyemi J.A.
Year Published:
 2017
Abstract:
High level of noise is a disturbance to the human environment. Noise in .industries is also an occupational hazard because of its attendant effects on workers' health. Noise presents health and social problems in industrial operations, and the source is related to the machineries used in the industries. One or the unique features or the noise associated with wood machinery is the level of exposure and duration. Equipment used in a factory can be extremely loud. They can produce noise at decibels high enough to cause environmental health and safety concerns. The mechanically driven transport and handling equipment, cutting, milling, shaping and dust extractor installations in the wood industry generate noise. The sources of noise pollution have increased due to noncompliance with basic safety practices. The increased use of locally fabricated machine in the industry has increased the level of noise and vibration. The effects of industrial noise pollution as discussed include: increase in blood pressure; increased stress; fatigue; vertigo; headaches; sleep disturbance; annoyance; speech problems; dysgraphia, which means reading/learning impairment; aggression; anxiety and withdrawal. As presented in this paper, noise control techniques include; sound insulation, sound absorption, vibration damping and Vibration isolation. 
Publisher:
 Journal Of Agriculture, Urban And Entomology
Publication Type:
 Journal
Publication Title:
 Resistance Of Some Indigenous Tree Species To Termite Attack In Nigeria
Publication Authors:
 Owoyemi J.M., Adiji A.O. And Aladejana T. J.
Year Published:
 2017
Abstract:
The resistance of some indigenous types of tree species Lo attack by termites (Blattodea: Termitidae) was investigated in Ondo State, Nigeria. Indigenous trees of different bulk densities used for this study were Celtis zenheri Engl. (Cannabaceae), Albizia lebbech (L.) Benth. (Fabaccae), Terminalia superba Engl. & Diels (Combretaccae), Cola giganiia A. Chev. (Malvaccae), and Terminaila ivorensis A. Chev. (Combretaccae). The three locations used for the study were Okitipupa, Akure, and AkungbaAkoko, representing lowland rainforest, tropical rainforest, and savannah regions, respectively. The primary termite species recovered were Macrotermes bellicosus (Smeathman), Macrotermes sybhylinus (Rambur) and Odoniotermes horni (Wasmann) for Okitipupa, Akure, and AkungbaAkoko, respectively. fieldexposure tests for each of the locations suggested that density affected the resistance of the wood samples to termite attack. Wood in the high density class had a better resistance to attack by termites compared with low density wood. The severity of attack was highest in Akure and least in the Okitipupa location. Irrespective of wood density and location in Ondo State, Nigerian lumber should be treated before installation to ensure protection. 
Publisher:
 Global Journal Of Advance Engineering Technology And Sciences
Publication Type:
 Journal
Publication Title:
 Evaluation Of The Physical And Mechanical Properties Of Composites Board Made From Banana Stalk (Musa Sapientum) And Pozzolan
Publication Authors:
 Owoyemi J.M., Akinbote F. And Aladejana J.T.
Year Published:
 2017
Abstract:
The need to find alternative materials for the production of composites board has led to the use of biofibres among which include locally available banana stalk. These wastes are found Littering local food markets and constitute environmental pollution. The boards were fanned using mixing ratio of cement to pozzolan at 1:0, 1:1and 2:1. Physical and mechanical properties of boards produced from banana stalk using ordinary Portland cement and pozzolan as binders were investigated. The influence of fibre lengths (25 and 50 mm) and mixing ratio on Density, Water Absorption (WA), Thickness Swelling (TS), Linear Expansion, Modulus of Rupture (!V!OR) and Modulus of elasticity (MOE) were determined. The mean values for WA, TS and LE showed that, after water immersion for 24, 48 and 72 hours, W A, TS and LF decreased with increase in mixing ratio while observed board density increased with increase in mixing ratio. MOE mean value ranged between 473.21 and 2728.8N/mm2 while MOE values ranged between l .46 and 3.49 N/mm2. MOE and MOR increased with increase in mixing ratio. The study has shown that boards produced from banana stalk compared favourably with boards produced from other lignocellulosic materials and has provided avenue for recycling banana waste causing environmental menace. 
Publisher:
 Journal Of Sustainable Environmental Management.
Publication Type:
 Journal
Publication Title:
 Preliminary Assessment Of Natural Resistance Of Borassus Aethiopum Mart. Wood To Termite Attack
Publication Authors:
 Falade, O.E. And Owoyemi, J.M.
Year Published:
 2018
Abstract:
The knowledge of natural resistance of wood used in an environment is necessary to guide builders in knowing precautions to be taken before construction due to the destructive activities of termites and other biodeteriorating agents. The natural durability of Borassus aethiopum wood was investigated longitudinally (i.e. top, middle and base) and transversely (inner portion and outer portion). Density results for B. aethiopum showed that the outer portion was higher than the inner portion with density mean values of 999.10 Kg/m3 and 502.78 Kg/m3 respectively. Weight loss due to termites’ attack was higher at the inner portion than the outer portion for the top, middle and the base part of the wood with mean weight loss of 9.87% and 0.75% for the inner and outer respectively revealing that the outer portion is more resistant than the inner as reflected also in the density result. The natural durability of B. aethiopum wood to termite attack was because of the arrangement of the vascular bundle tissues which were concentrated on the outer part of the bole, making it more resistant to termites than the inner part which suggests separation of the inner from the outer during conversion process to guarantee its integrity in service. Preservative treatment therefore becomes imperative for the inner portion of the wood to prolong its service life. 
Publisher:
 NonConventional Materials And Technologies – NOCMAT For XXI Century Materials Research Forum LLC Materials Research Proceedings 7 (2018) 341348 DOI: Http://dx.doi.org/10.21741/978194529183831
Publication Type:
 Journal
Publication Title:
 Effect Of Production Variables On The Properties Of Cement Bonded Flake Board From Polyalthia Longifolia (Sonn.)Thw. Wood
Publication Authors:
 Owoyemi J.M. And Oyeleye I.O
Year Published:
 2018
Abstract:
The need to source for other woody materials for particle board like spent ornamental is on the increase due to reduction in the supply of timber from natural forest. Therefore, this study was aim at evaluating the effect of flake size and mixing ratio on the physical and mechanical properties of cement bonded particleboards produced from Polyalthia longifolia wood residues, a readily available and underutilized tree species. The production variables flake sizes of 19.85 mm, 19 mm and 6.35 mm and woodcement ratios of 1:1, 2:1, and 3:1. The boards produced were subjected to physical properties tests such as water absorption, thickness swelling and linear expansion at 24, 48 and 72 hours. Water absorption, thickness swelling and linear expansion increased with decrease in flake size and mixing ratio. For the mechanical properties, the flake size of 19 mm had the highest strength as the mixing ratio increases while FS of 6.35 mm had the lowest strength. Flake size and mixing ratio had significant effects on the properties of the boards produced (P>0.5). Hence the study affirmed the suitability of spent Polyalthia longifolia flakes for Cement Bonded Board which can be used for both interior and exterior applications in building.