FACULTY OF TECHNOLOGY
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Item 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 purposesItem 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.Item 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.