Faculty of Engineering, Technology, Applied Design & FineArt (FETADFA)
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Browsing Faculty of Engineering, Technology, Applied Design & FineArt (FETADFA) by Subject "Assessing"
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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 Different Particle Sizes of Coarse Aggregates on Concrete Properties.(Kabale University, 2024) Ahabwe, ReinhardConcrete's compressive strength represents the hardened concrete's capacity to resist compressive loads without cracking or deforming. Duff Abrams found that concrete strength largely depends on the water-to-cement ratio. However, other factors, such as cement strength class and fineness, concrete age, curing duration, admixtures, and aggregate properties (including size, shape, texture, and strength), also significantly impact compressive strength. This study investigated how varying particle sizes of coarse aggregate affect concrete properties. Results showed that compressive strength at 28 days increased as the size of coarse aggregates decreased, with strengths recorded at 25, 23.3, 21.5, and 19.7 MPa for 10, 14, 20, and 28 mm aggregate sizes, respectively. This trend is attributed to denser packing and stronger bonding among smaller particles. Additionally, workability was found to increase with larger aggregate sizes, with slumps measured at 76, 81, 87, and 98 mm for 10, 14, 20, and 28 mm aggregates, respectively, due to larger aggregates having a lower surface-to-volume ratio, which reduces contact between aggregate particles and the cement paste.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 Assessing the Hydraulic Performance of Ntungamo Town Piped Water Distribution System.(Kabale University, 2024) Ahimbisibwe, JamesA water supply system comprises engineered hydrologic and hydraulic components designed to deliver water for various purposes. Water is a fundamental necessity for all living beings, yet the demand for water—spanning domestic, industrial, and agricultural needs—continues to rise, while water sources remain limited. This creates a significant challenge for authorities worldwide to meet growing demands using finite resources. Water distribution networks are crucial for regional development, as they serve multiple purposes beyond providing water for human consumption, directly influencing a nation's progress. Reliable water supply, a key component of these networks, plays a vital role in sustaining and improving public quality of life. To address the challenges of water scarcity and insufficient pressure, designing new water distribution systems or upgrading existing networks becomes essential. This study focused on assessing the existing water distribution network in Ntungamo Town, Ntungamo District, using EPANET 2.0 software. The area was selected due to recurring issues such as water scarcity and low pressure affecting different parts of the town. The study involved simulating the pipe and junction network system to analyze its behavior under varying input conditions using EPANET 2.0. Hydraulic parameters, including head, pressure, and flow rate, were evaluated during the simulations. The findings demonstrated that the pressures at junctions and the flow rates and velocities in pipes were generally feasible for providing adequate water to the area. However, the study identified that low water pressures in Ntungamo Town's piped water distribution system were primarily due to insufficient water yield within the system.Item Restricted Assessing the Impact of Sustainable Construction Practices on Project Performance.(Kabale University, 2024) Niwahereza, BlairThe purpose of this research was to assess the impact of sustainable construction practices on project performance. Questionnaire surveys were conducted across stakeholders that included site engineers, consultants and contractors. The research categorized the proposed strategies to the implementation of sustainable construction practices using relative importance index (RII) as a basis of analysis. The most commonly used sustainable construction practices were identified as; use of local materials, use of bio-degradable materials, use of recycled materials, prefabrication and water conservation measures. Out of the 56 respondents, 16.1% were familiar with prefabrication, 14.3% were familiar with the use of bio-degradable materials, 28.6% were familiar with the use of water conservation measures, and 8.9% were familiar with the use of recycled materials and 32.1% constituted to those who were familiar with the use of local materials. The relationship between sustainable construction practices and project performance was critically determined using regression analysis and project performance was basically based on time, cost and quality. The general response from both parties were analyzed, high scored mitigation measures were discussed; awareness and education should be implemented, innovation and technology adoption; industry collaboration and partnerships, certification and standards, performance monitoring and reporting, and providing incentives were identified as the most effective strategies in implementing sustainable construction practices on construction projects. Awareness and education was ranked first with RII of 0.875, innovation and technology adoption was ranked second with RII of 0.857, industry collaboration and partnerships was ranked third with RII of 0.811, certification and standards was ranked fourth with RII of 0.807, performance monitoring and reporting was then ranked last with RII of 0.725.Item Restricted Assessing the Use of Crushed Rock Aggregate and Carbon Black for Laterite Soil Stabilization in Road Construction.(Kabale University, 2024) Turyamureeba, EmmanuelThe increasing demand for crushed rock aggregates in road construction has significantly contributed to the depletion of rock resources in Uganda. This research and design project aimed to explore the use of carbon black to reduce the volume of crushed rock aggregates required for the mechanical stabilization of lateritic soils for road base construction. Lateritic soil samples were collected from a borrow pit near Nyakambu, 1 km from Kekubo town along the Kekubo-Kikungiri Road. Crushed rock aggregates ranging from 0.075 mm to 10 mm in size were sourced from a quarry near the Faculty of Engineering, approximately 2 km from Kabale town off the Kabale-Kisoro Road. Carbon black was procured from GM Tire Recycling Plant in Njeru, Eastern Uganda (00°22’42.9” N, 33°08’10.4” E). Preliminary tests, including Particle Size Distribution, Atterberg Limits, Maximum Dry Density, and California Bearing Ratio (CBR), were conducted to assess the suitability of the lateritic soil for stabilization. The results classified the soil as Clayey Gravel with Sand of high plasticity according to the Unified Soil Classification System (USCS), confirming the need for stabilization for road base use. The combined effect of carbon black and crushed rock aggregates was evaluated based on compaction characteristics, Atterberg Limits, Particle Size Distribution, and CBR tests. Graphical analysis of the results revealed that a blend of 50% lateritic soil, 40% aggregates, and 10% carbon black was the most effective, yielding a CBR of 63.0 at 98% relative compaction and a Plasticity Index (PI) of 6.5. These results meet the General Specifications for Roads and Bridges by Uganda’s Ministry of Works, Housing, and Communication, which require a CBR above 60%. The study concluded that replacing the conventional 50% aggregates and 50% lateritic soil mixture (as suggested by Jjuuko et al., 2014) with the proposed blend reduces crushed rock aggregate consumption by 10%. The research successfully met all its objectives and demonstrated a sustainable approach to road base construction by incorporating carbon black.