Browsing by Author "Akinyemi B. A."

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Challenges and prospects of selected controlled environment agriculture (cea) structures in ibadan metropolis
(2014) Omoniyi T.E.; Akinyemi B. A.; Yussuff S.O.
Over the years, the concepts of climate change and global warming has been continually studied and its expected effects have been well documented. These environmental issues have reduced the effectiveness of open field agriculture and as such other cultivation methods had to be devised; controlled environment agriculture is one of such methods. This survey was conducted in three selected controlled environment agriculture structures within Ibadan City to determine the challenges and some environmental factors affecting the use of controlled environment agriculture structures in this area. The research methodology used included visual inspection, field measurements and personal interviews. The results showed that that only a few of the factors that could be controlled were being controlled in all the locations visited and that controlled environment agriculture is still in the research stage in Ibadan particularly when talking about the crop cultivation aspect. Other challenges in its usage included inadequate water supply, epileptic power supply, lack of adequate ventilation, litter management, egg cannibalism, feed management and poor maintenance. It was suggested that the controlled environment agriculture structures management should provide alternative power and also introduce devices that will aid air and heat movement as well as temperature control. Reuse of litter for manure and proper maintenance were also recommended
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
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.