This study explores the integration of sea sand as a substitute for conventional fine aggregates in epoxy polymer concrete. The research addresses the pressing environmental concerns associated with the overreliance on river sand, offering a sustainable alternative. The investigation evaluates the unique combination of epoxy resin and sea sand, examining their synergistic impacts on the mechanical strength and durability of the concrete. The study's objectives encompass material property analysis, mix proportion determination using IS Code, workability assessment, and comprehensive evaluation of mechanical and durability properties. Environmental benefits include minimized river sand usage, reduced quarrying, and the utilization of sea sand as an abundant alternative. However, limitations include the need for desalting procedures for sea sand and the associated high costs, as well as the absence of suitable desalting technologies. This research contributes valuable insights into eco-friendly concrete production and proposes an innovative approach to enhance the durability of polymer concrete. In a comprehensive exploration of epoxy-sea sand concrete, incorporating varying sea sand and epoxy resin proportions, significant findings emerged. Workability, assessed through the slump test, improved with higher sea sand substitution, compensating for epoxy's cohesion. All sea sand mixes exceeded control concrete in slump values, with pronounced enhancements at higher sea sand ratios. Sea sand acted as a lubricant, counteracting epoxy's workability reduction. Compressive strength varied, decreasing with epoxy substitution but increasing with sea sand, especially under water curing. Flexural strength consistently surpassed normal concrete, peaking with 20% sea sand in water-cured epoxy concrete. Splitting tensile strength excelled in epoxy-sea sand mixes, up to a threshold, revealing a complex interplay of sea sand and epoxy. Bond strength was notably higher in sea sand epoxy concrete, improved by epoxy's adhesive and sea sand's shear capabilities. Impact strength increased with sea sand, showcasing its potential for enhancing concrete durability. This study unravels the intricate dynamics between sea sand and epoxy resin, shedding light on their roles in various concrete aspects under diverse curing conditions.
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