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:
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:
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:
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