Evaluating the benefits of Ultra-High-Performance Fiber Reinforced Concrete (UHPFRC) for Rehabilitation of Dams: Insights for Potential Integration into the KDRP in Zambia

Ultra-high-performance fiber-reinforced concrete (UHPFRC) is a cutting-edge material in the field of cement-based engineering, offering significant advancements over traditional concrete. Its superior compressive strength along with its enhanced durability, has garnered growing interest across the globe. UHPFRC's ability to withstand aggressive conditions and its high resistance to abrasion and corrosion make it particularly suitable for applications demanding long-term performance. Experiments carried out on UHPFRC has revealed a compressive strength greater than 150MPa. The choice of fibers, their quantity, alignment, and length are crucial factors that shape the mechanical characteristics of UHPFRC. UHPFRC has gained notable notoriety as a versatile material that can be tailored to suit specific project needs as its mechanical properties can be modified to match the requirements of the intended application. Developing sustainable structures is essential for advancing Zambia's energy sector, particularly in the construction and rehabilitation of dams, with a specific focus on large-scale hydroelectric power facilities like the Kariba Dam. Because of the damage in its significant parts, such as the plunge pool and sluice gates, the Kariba Dam is now in a dangerous state that needs urgent rehabilitation. The continued operation of the Kariba Dam depends heavily on timely rehabilitation efforts to address aging infrastructure and environmental wear. Traditional concrete often exhibits limitations that require frequent repairs and high costs. UHPFRC has emerged as a promising alternative to conventional concrete due to its superior mechanical properties, durability, and reduced environmental footprint. The study compares UHPFRC with conventional concrete, highlighting the benefits and limitations of each material in dam rehabilitation. By analyzing the Kariba Dam Rehabilitation Project (KDRP), the paper explores how Ultra-High-Performance Fiber Reinforced Concrete (UHPFRC) could offer a superior alternative to conventional concrete. It discusses the material's characteristics, its advantages in terms of structural performance and longevity, and the economic and environmental implications. The study argues that while conventional concrete has been the material of choice for decades due to its availability, cost-effectiveness, and proven performance, UHPFRC offers superior durability, strength, and longevity, which could extend the lifespan of Zambia's existing dams.