Optimizing Fly Ash Content For Enhanced Durability In High- Performance Sustainable Concrete – A Experimental Approach

Abstract

The incorporation of fly ash in high-performance concrete (HPC) presents a sustainable alternative to
traditional cementitious systems, enhancing both durability and environmental benefits. This study investigates
the impact of varying fly ash content (20%, 30%, and 40%) on compressive strength, workability, and durability
properties such as permeability, sulfate resistance, carbonation depth, and freeze-thaw resistance. Experimental
results indicate that while increased fly ash content improves long-term strength and durability, it leads to
reduced early-age strength, posing challenges for rapid construction projects. The optimum fly ash content is
identified between 30% and 40%, balancing mechanical performance and durability while minimizing cement
consumption. The study further compares the performance of fly ash-based HPC with conventional concrete,
emphasizing improved resistance to aggressive environmental conditions. Additionally, potential challenges,
such as delayed strength gain and workability concerns, are discussed, along with mitigation strategies,
including optimized curing methods and hybrid binder systems. The findings highlight the viability of fly ash in
creating durable, cost-effective, and environmentally friendly concrete, aligning with sustainable construction
goals.