Author(s): Dr. Santiago Emilio Vargas and Dr. Camila Andrea Torres

Abstract: High-performance concrete (HPC) has emerged as a promising solution to address the sustainability challenges of traditional concrete in construction. This study aimed to evaluate the mechanical properties, durability performance, and environmental impact of HPC mixes incorporating supplementary cementitious materials (SCMs) such as fly ash, silica fume, and ground granulated blast furnace slag (GGBS), along with nano silica. The objectives included optimizing mix designs, assessing lifecycle environmental benefits, and analysing economic feasibility. Experimental methods involved the preparation and testing of HPC samples under standardized conditions to evaluate compressive and flexural strength, modulus of elasticity, chloride penetration resistance, and sulphate attack resistance. Lifecycle analyses and cost-benefit evaluations were conducted to understand environmental and economic implications. The results demonstrated a 58% improvement in compressive strength for HPC with 40% fly ash substitution compared to traditional concrete, while nano silica-enhanced mixes showed a 22% increase in early-age strength. Durability tests revealed reduced chloride penetration (4–6 mm) and water absorption (25% lower), alongside enhanced sulphate resistance. Environmental analysis showed up to 35% reduction in CO2 emissions due to reduced clinker content, and lifecycle cost evaluations indicated a 20% maintenance cost reduction over 50 years. Statistical analysis confirmed significant differences between HPC and control mixes, highlighting the impact of SCMs and nano silica. The study concludes that HPC offers superior performance, environmental sustainability, and long-term cost savings, making it a viable material for sustainable construction. Practical recommendations include adopting SCMs, developing standardized guidelines, and leveraging advanced technologies for mix optimization. Future research should focus on alternative materials, field validation, and long-term durability under diverse conditions to further enhance HPC's sustainability profile.

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