International Journal Of Scientific Research In Multidisciplinary Studies
Accelerated Aging Assessment Of Cement Bonded Board Produced From Gmelina Arborea (Roxb.) Strand And Sawdust
Owoyemi J.M. And Ogunrinde O.S.
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.
ISROSETInternational Journal Of Scientific Research In Multidisciplinary Studies
Sustainable Management Of Nigerian Forest Through Efficient Recovery Of Harvesting Residues
Ogunrinde Olayemi Segun And Owoyemi Jacob Mayowa
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.
Environmental And Socioeconomic Studies.
Sustainable Wood Waste Management In Nigeria
Owoyemi J.M., Habeeb O. Z. And Isa O.E.
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.
Applied Journal Of Tropical Agriculture FUTA.
Effect Of Thermal Treatment On Physical And Mechanical Properties Of Hevea Brasiliensis (Rubber) Wood
Owoyemi J.M. And Iyiola E.A.
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
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
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
Modern Environmental Science And Engineering Journal.
Physicomechanical Properties Of Thermally Modified Gmelina Arborea Wood
Owoyemi J.M., Adebayo H.H. And Aladejana J.T.
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
Biomedical Statistics And Informatics
Noise Pollution And Control In Mechanical Processing Wood Industries
Owoyemi J.M., Falemara B.C. And Owoyemi J.A.
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.
Journal Of Agriculture, Urban And Entomology
Resistance Of Some Indigenous Tree Species To Termite Attack In Nigeria
Owoyemi J.M., Adiji A.O. And Aladejana T. J.
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,
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,
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
Global Journal Of Advance Engineering Technology And Sciences
Evaluation Of The Physical And Mechanical Properties Of Composites Board Made From Banana Stalk (Musa Sapientum) And Pozzolan
Owoyemi J.M., Akinbote F. And Aladejana J.T.
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.
Journal Of Sustainable Environmental Management.
Preliminary Assessment Of Natural Resistance Of Borassus Aethiopum Mart. Wood To Termite Attack
Falade, O.E. And Owoyemi, J.M.
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.
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
Effect Of Production Variables On The Properties Of Cement Bonded Flake Board From Polyalthia Longifolia (Sonn.)Thw. Wood
Owoyemi J.M. And Oyeleye I.O
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.