Browsing by Author "Omoniyi T. E."

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Development and performance evaluation of a laboratory batch pulp digester
(2013) Omoniyi T. E.; Onilude M. A.
Development of bamboo – rice husk ash and cement mixture for livestock house roofing sheets
(2013) Omoniyi T. E.; Akinyemi B.A.; Olusoji A.O.
The purpose of this research is to design, fabricate and install locally developed roofing sheets on a king post truss model of a livestock house using rice husk and bamboo fibers which are readily available in most Nigerian farms with some additions of cement to the mixture. The effects of ratios of Rice Husk Ash (RHA) and bamboo fibers on the impact strength, density, thickness swelling and water absorption were also investigated. The average density of the composite roofing sheet produced ranged from 1779 to 2197Kg/m3. The control test specimen density was 2376Kg/m3. The addition of pozollan decreased the density of the composite. Thickness Swelling (TS) values ranged from 0.07 to 5.97% at two hours and from 0.08 to 6.5% at 24 hours for different composition. The percentage water absorption (WA) by the composite was from 0.17 to 1.13% at 2 hrs while it was 0.21 to 1.43% at 24hrs. However further research would be carried out on the structure to determine the thermal comfort of the livestock to be kept in the building.
Hydration characteristics of bagasse in cement-bonded composites
(2013) Omoniyi T. E.; Akinyemi B. A.
Four compatibility assessment methods were used to ascertain the compatibility of bagasse with cement composite. The time to reach maximum hydration temperature was achieved when CaCl2 and water above 60℃ were used as treatment agents. Maximum hydration temperature between 55℃ – 61℃ were achieved when treated with 1 – 3% CaCl2. The inhibitory index value of 1.58% - 8.83% were achieved when treated with bagasse while others have value greater than the acceptable parameter standard for exterior use. The maximum hydration rate of 4.0 was achieved when the bagasse fiber was treated with 3% CaCl2 and this was closely followed by 2% CaCl2 at 3.38. These results showed that all the different compatibility assessment parameters adopted indicated that bagasse was incompatible with Portland cement without pre treatment. Treatment of bagasse with cold water and addition of 2% CaCl2 satisfied all requirements for compatibility in terms of time to reach maximum temperature, the maximum hydration temperature and the inhibitory index value. Treatment with CaCl2 gave the best result probably due to its capacity to minimize the adverse effect of the soluble sugars and extractives and also to accelerate cement hardening and setting. This result shows that treated bagasse is compatible with cement bonded composite for construction purposes
Life cycle assessment of vegetable oil production: a case study of an oil mill in Ibadan, Nigeria
(2014) Bamgbade O. A.; Omoniyi T. E.; Ewemoje T. A.
The gate-to-gate study aimed to evaluate the potential environmental impacts associated with the production of vegetable oil and to proffer ways of improving and reducing some of the environmental impacts associated with the production system. This study compared the Life Cycle Impact Assessment (LCIA) of four scenarios; different transportation distances for palm kernel materials and different type of fuel used in the boiler. The LCIA was conducted using Gabi 6 and Tool for the Reduction and Assessment of Chemical and other Environmental Impacts (TRACI) methodology. Overall energy consumption in the crushing plant was 34,647.77 MJ and energy consumption in the refining plant was 23,371.65 MJ. Global Warming Potential (GWP) was from 0.0771 kg CO2-equiv., to 0.0763 kg CO2- equiv. for all scenarios. Acidification Potential (AP) values for the four scenarios were: 0.0493 kg H+, 0.0478 kg H+, 0.0476 kg H+ and 0.0492 kg H+ moles-equiv. Eutrophication Potentials (EP), were 6.796E-5 kg N-, 4.88E-5 N-,6.726E-5 N- and 4.905E-5 N-equiv. for scenarios 1, 2, 3 and 4 respectively. Energy is consumed and expended more in the crushing plant than in the refinery plant. The best environment viable for vegetable oil production is to have a short distance as possible for raw materials and the use of diesel oil for firing boilers (scenario 2) as compared with Low Pour Fuel Oil (LPFO). It was recommended that study on environmental performance of vegetable oil production from different oil sources should be investigated in Nigeria, from cradle to grave.
Performance of concrete paving blocks reinforced with bamboo and rice husk ash as partial replacement for cement
(2013) Omoniyi T. E.; Akinyemi B. A.; Akinosun T. A.
This research involved the production and evaluation of concrete paving blocks (CPBs) by partially replacing the cement content by rice husk ash (RHA) and addition of bamboos. One of the problems usually experienced during the service life of concrete paving blocks include occasional failure due to excessive surface wear. This has led to the preference of other materials of construction. CPB samples with 100% cement content plus 0%, 1%, 2%, and 3% bamboo by weight of cement were produced. Others were 0%, 10%, 20%, and 30% cement replacement with RHA plus 3% in each were produced. Mechanical tests including compressive, flexural and abrasive strength tests were performed on the samples and the results gotten were analyzed. It was observed that cement replacement up to 20% by RHA with 3% is appropriate in strength. Also, the presence of in the blocks had a positive effect on their strength properties. Surface wear in all the CPB samples were also observed to have drastically reduced far below the 1% allowable limit.
Permeability coefficient and porosity characteristics of bagasse fiber reinforced concrete
(2013) Omoniyi T. E.; Akinyemi B.A.
The durability of concrete structures is a major challenge facing concrete community today. Porosity and permeability played paramount roles in determining the durability of concrete. The inclusion of fibre reinforcement in concrete can enhance some of its engineering properties. This paper investigated the influence of bagasse fibre inclusion on the porosity and permeability of concrete. A series of laboratory porosity and permeability tests were carried out. The fibre length varied from 10mm to 25mm while the volume ranged from 0 to 5% of cement mass. The results proved that bagasse fibre inclusion increased the porosity and reduced the permeability slightly initially and increased it afterwards. At fibre volume of less than 3%, the influence of different lengths of fibre on water permeability shows that high porosity does not mean high permeability. The main factor which governs permeability is the void spaces interconnections.
Sorption characteristics of cement composite reinforced with some locally available lignocellulosic materials in Nigeria
(2013) Omoniyi T. E.; Olorunnisola A.O.; Akinyemi B.A.
The aim of this study was to investigate the sorption property of wood cement composite produced from bagasse (Saccharum officinarum), bamboo (Bambusa vulgaris) and coir (Cocos nucifera L). The mass of the fibre varies from 1 to 6% of the mass of cement. The result indicated that the mass fraction has significant effect on the sorption properties of the composites. Water absorption (W.A.) rate increases with increase in the fibre content of the composites. Thickness swelling (T.S.) in all the composites was less than 1.7% at 24 h water immersion at room temperature. There was linear correlation between mass fraction, water absorption and thickness swelling of the composites. The relatively low W.A. capacity and T.S. at content less than 3% of mass of cement suggests that they can be employed in outdoor situations and at this level they are dimensionally stable but beyond this level it is not advisable.