INVESTIGATING THE INFLUENCE OF SEAWATER AND FLY ASH ON THE COMPRESSIVE STRENGTH AND CARBONATION RESISTANCE OF CONCRETE

This study focuses on the combined influence of seawater and fly ash on the compressive strength and carbonation resistance of concrete, addressing critical aspects for sustainable construction, particularly in coastal and marine environments. The increasing demand for sustainable building materials and the need to utilize industrial by-products like fly ash as a partial replacement for cement are driving factors. However, the use of seawater in concrete mixing, especially in conjunction with supplementary cementitious materials, introduces complexities regarding long-term durability, particularly against carbonation. This research investigates how varying proportions of fly ash, when incorporated into concrete mixed with seawater, affect its mechanical properties, specifically compressive strength, and its resistance to carbonation, a key degradation mechanism. Experimental programs involve preparing concrete mixes with different fly ash contents and using either fresh water or seawater for mixing. The specimens are then subjected to compressive strength tests at various curing ages and accelerated carbonation tests. The findings aim to provide valuable insights into the feasibility and performance of using seawater and fly ash in concrete production, contributing to more resilient and environmentally friendly construction practices in challenging exposure conditions.