Browsing by Author "Omoniyi T.E"

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Development of latex modified concrete from virgin latex paints
(2017) Banjo A.A.; Omoniyi T.E
This study investigated the prospects of utilizing virgin latex paints to produce a high performing concrete. Latex variations of 5, 10 and 15% weight of cement were used to produce samples of the concrete. Physical, mechanical, thermal and microstructural analyses were determined. An improved physical property with low moisture penetration and density were observed for the latex modified concrete. Thermal performance showed that the thermal conductivity ranged from 89.12 – 109.37
Development of milling ancilliary compatible with two-stroke power saw engine for short log conversion.
(2010) Adewole A.N.; Alani S.A.; Omoniyi T.E
Chainsaw milling is an inevitable means of preventing quantum wastage of valuable and scarce wood resourse in un-accessible locations. Milling attachment (MA) was developed for a two stroke power chainsaw to reduce milling difficulties, risk and wastage. Operators of power-saw (90) were randomly selected and interviewed to elicit information on profile and limitations of chainsaw milling. Milling ancillary was developed for two stroke power-saw engine (T-S-PSE) with power to weight ratio rating and guide bar length of 1.5g/w and 75.0cm respectively. Results showed that only 33.3% had formal training while 65.6% were hitherto either unskilled labourers involved in logging activities or sawmill sawyers. About 57.8% respondents own their machine with 32.7% of them engaged in log merchandize. The average age on chainsaw milling was 15years and it was a means of livelihood for only about 64.4% of the total respondents. This group of respondents is often engaged throughout the year , worked at both open field and forest reverves in Oyo , Osun and Ogun States. The criteria for service charge includes activities. Log girth, location and environment. MA suitable for use with the described T-S-PSE for milling 500mm maximum log diameter was developed at the cost of four thousand nine hundred naira (N 4900). The study was able to develop MA compatible with T-S-PSE and with 69% performance efficiency.
Effect of moisture on thermal properties of acrylic polymer modified mortar reinforced with alkali treated bamboo fibres
(2018) Akinyemi B.A; Omoniyi T.E
In this study, bamboo fibres were used as reinforcement materials for acrylic emulsion polymer modified cement bonded concrete after treatment with 10% weight of NaoH solution at 23 _C for 24 h. Thermal conductivity, thermal resistance and thermal transmittance were studied and the effects of moisture penetration at 11% wet basis were evaluated. Moisture penetration greatly reduced the thermal strength of the concrete with the exception at 10% acrylic polymer addition and 1.5% bamboo fibre inclusion. Based on the findings it can be reported that bamboo fibres greatly improved the thermal performance of the composite building material while the inclusion of acrylic polymers also hindered to a large extent the penetration of moisture into the capillary network.
Effect of moisture on thermal properties of acrylic polymer modified mortar reinforced with alkali treated bamboo fibres
(2018) Akinyemi B.A; Omoniyi T.E
In this study, bamboo fibres were used as reinforcement materials for acrylic emulsion polymer modified cement bonded concrete after treatment with 10% weight of NaoH solution at 23 _C for 24 h. Thermal conductivity, thermal resistance and thermal transmittance were studied and the effects of moisture penetration at 11% wet basis were evaluated. Moisture penetration greatly reduced the thermal strength of the concrete with the exception at 10% acrylic polymer addition and 1.5% bamboo fibre inclusion. Based on the findings it can be reported that bamboo fibres greatly improved the thermal performance of the composite building material while the inclusion of acrylic polymers also hindered to a large extent the penetration of moisture into the capillary network.
Primary wood conversion and processing in nigeria : a status report.
(1999) Olorunnisola A.O; Omoniyi T.E
Properties of latex polymer modified mortars reinforced with waste bamboo fibers from construction waste
(2018) Akinyemi B.A.; Omoniyi T.E
This study evaluated the properties of latex modified cement mortars from ordinary paints which were reinforced with treated bamboo fibers from construction waste. Fiber variations of 0, 0.5, 1 and 1.5% at 10% of the weight of cement were utilized. Mechanical properties were determined according to standards; similarly, scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS) were used to analyze the micro structural and elemental properties of the samples. The experimental results revealed that the addition of 1.5% bamboo fibers and 10% latex solution produced excellent mechanical properties. This was as a result of improved fiber adhesion to the matrix through pre-treatment, coupled with the contributed high strength from the latex paint modified mortars. The micro graph showed that latex precipitated in the voids and on the surface of the bamboo fibers as well as gels of calcium silicate hydrates which contributed to the observed improvement in strength of the tested samples.
Repair and strengthening of bamboo reinforced acrylic polymer modified square concrete columns using ferrocement jackets
(2020) Akinyemi B.A; Omoniyi T.E
This study investigated the role of acrylic polymer as concrete matrix modifier and fer- rocement jacket confinement to repair and strengthen treated bamboo reinforced square concrete columns. 30 concrete columns (CC) of 150 ×150 ×600mm were produced us- ing cement:sand:aggregate ratio of 1:3:3 and a polymer:cement ratio of 1:10 based on ACI 548.3R standard. 10 CCs’ were produced from both conventional and modified concrete which were tested until failure. Another 10 CCs’ from both concrete design mixes were preloaded at 25%, 50%, and 75% of ultimate load and thereafter repaired with ferrocement jacket and axially tested. The last 10 CCs’ were ferrocement jacketed before axial testing. Axial and lateral deflections were evaluated during the tests. The crack pattern and fail- ure modes of the columns were also considered. The highest average ultimate load was obtained from column with ferrocement and polymer addition at 60% increase in compar- ison with the control column. The least axial and lateral deflections were 93% and 72% which were from columns repaired with ferrocement material. The cracks in the interface and its propagation developed with sequential increment of load and new cracks started to form at zones closer to the upper face in contact with the machine. Bulging and peeling of mortars characterised the failure pattern of the CCs’. Acrylic polymer and ferrocement jacket repaired columns showed an improvement which came close to the strength of the unrepaired.
Yield, Characterization and Potential Application of Activated Carbon Produced from Co – pyrolysis of Wood and Plastic Wastes as Adsorbent for Aquaculture Wastewater Treatment
(2018) Omoniyi T.E; Salami H.A
Pollution from municipal solid wastes and wastewater from different agricultural operations pose detrimental effect to the environment such as wood and plastic wastes as well fish pond effluent. co – pyrolysis of these solid wastes to produce activated carbon for the treatment of fish pond effluent serves as a means of reducing their negative impact on the environment as well as a viable alternative means of producing energy. Hence, plastic and wood wastes and fish pond effluent were collected for this study. the plastic wastes were washed, dried, shredded using cutlass and hammer milled to a particle size in the range of 1 – 5 cm. the sawdust was oven dried to a moisture content of 10% on dry basis and sieved through a 2mm mesh. in this work, sawdust (80%) and plastic (20%) wastes were co – pyrolysed in a pyrolysing unit. The influence of pyrolysis temperature on the product yields was investigated and part of the produced biocharwas activated using 460ml of nitric acid (hno3). The collected fish pond effluent was subjected to adsorption using activated and non – activated biochar as the adsorbents at 3g, 4g and 5g dosage levels. Results showed that the yield of biochar reduced with increase in temperature. Biochar produced at 400oc had the highest carbon content of 77.20%. Also, the fixed carbon, moisture content and ash of the produced biochar increased with increase in temperature while the volatile content decreased with increase in temperature. The results indicated that there were significant differences in the dosage levels of biochar utilized for the treatment in both cases for all the considered parameters except for ph. the removal efficiencies of phosphate and turbidity were the highest for the two absorbents: 89.17%, activated biochar. However, there was no significant difference between the two treatment options at 5% significance level (α) for all parameters such as ph, turbidity, total kjeldahl nitrogen, nitrate, nitrite, phosphate, total dissolved solids (tds), biochemical oxygen demand (bod), chemical oxygen demand (cod) and dissolved oxygen (do) except for total suspended solid (tss) with probability level less than 0.025.