Faculty of Engineering, Technology, Applied Design & FineArt (FETADFA)
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Browsing Faculty of Engineering, Technology, Applied Design & FineArt (FETADFA) by Subject "Concrete"
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Item Restricted Assessing the Effect of Accelerators and Retarders on the Early-Age Compressive Strength of Concrete.(Kabale University, 2024) Gumoshabe, EdgarAccelerating admixtures affect the rates of reactions between cement and water to give an overall increase in the hydration rate. Retarding admixtures on the other hand slow down the hydration rate. Thus, the use of accelerators in concrete provides a shortening of setting time and/or an increase in early strength development and retarders increase the setting time and reduce early strength development. In this project, the issues of slow down and uncontrolled rapid setting and hardening of concrete or addressed by the use of accelerating and retarding admixtures (Calcium Chloride and Citric Acid respectively) in concrete. Calcium chloride and citric acid were added in four samples, with quantities of 1%, 1.5 %, 2%, and 2.5% by weight of cement, which were taken as mix -1 and mix -2. The concrete samples were tested 1, 3, 7, and 28 days of Compressive strength. The concrete specimens were laid for M25 grade of concrete.Item Restricted Assessing the Effect of Partial Replacement of Fine Aggregates in Concrete with Iron Ore Tailings in Kigezi Sub-Region.(Kabale University, 2024) Musasizi, AllanThis study aimed to assess the strength properties of concrete produced using IOT as partial replacement of the natural sand as fine aggregates. IOT is a waste product of iron ore mineral that is abundantly available in some regions and has the potential to be used as a sustainable alternative to traditional fine aggregates. In this research, the mixture, C15, was designed with 10%,25%, and 50% of IOT, natural fine aggregates and natural coarse aggregates. Properties considered included: workability, unit weight and compressive strength. Test results indicated that in all cases, IOT concrete gave high compressive strength than the conventional concrete. In conclusion, this study suggests that IOT can be used as a viable alternative to partially replace traditional fine aggregates in the production of concrete with acceptable strength properties for structural applications in pavement and floor slabs. Further research should however be carried out to investigate the durability and performance of IOT-based concrete.Item Restricted Investigating the Performance of Epoxy Concentrations in the Self-Healing of Concrete.(Kabale University, 2024) Manzi, Evans EvalistConcrete, a fundamental construction material, is susceptible to various forms of damage (cracking). Formation of cracks may result due to the shrinkage effects during curing and mechanical loading which deteriorate the concrete performance especially in terms of durability aspect. Traditional methods of repair often involve human intervention and significant costs. In recent years, the concept of self-healing concrete has gained traction as a potential solution to mitigate the impact of cracks and enhance the longevity of structures. Self-healing concrete by using bacteria as a healing agent had gained interest among researchers. In contrast, this research delves into the intricate relationship between epoxy concentrations and the self-healing capabilities of concrete, aiming to provide comprehensive insights into optimal concentrations and their implications for construction. The experiment involved varying epoxy concentrations, ranging from 0% to 15%, in concrete mixes. Critical parameters, such as slump, compressive strength at 28 days, and microscopic structure after crack induction, were meticulously analyzed. The objective was to understand how epoxy, known for its adhesive and cohesive properties, influences the mechanical properties and self-healing potential of concrete. The experimental setup aimed to simulate real-world scenarios where concrete structures may be exposed to external stresses leading to cracks. The results revealed a consistent decrease in slump as epoxy concentrations increased, indicating a reduction in concrete work-ability. Notably, the compressive strength at 28 days exhibited a fascinating trend. At 5% epoxy, there was a modest increase in strength, while the optimal concentration of 10% demonstrated a significant enhancement. However, concentrations beyond the optimum (15% epoxy) led to a decline in compressive strength. The experiment's pivotal phase involved crack induction to assess self-healing capabilities. At 10% epoxy concentration, the compressive strength increased after crack induction. Microscopic analysis further corroborated these findings, revealing signs of self-healing within the concrete matrix. This enhancement suggested a unique healing mechanism associated with the optimal epoxy concentration.