This study explores the potential of utilizing sea sand and recycled green materials in Basalt Fibre Reinforced Polymer (BFRP) composites to address the challenges of sand scarcity and promote sustainable development in coastal projects. Waste seashell powder (10 % and 20 %) and waste rubber powder (5 % and 10 %) were partially incorporated as replacements for sea sand in BFRP composites. The influence of various percentages of waste seashell powder and waste rubber powder on key parameters like workability, density, water absorption, mechanical properties and shrinkage were examined. Testing results demonstrated that all BFRP composite mixes exhibited moderate workability, slightly decreasing with waste seashell and rubber powder inclusion. Notably, the utilization of waste seashell powder significantly improved compressive strength (around 40 %), elastic modulus (around 35 %), tensile strength (up to 178 %), and flexural strength (up to 70 %). Adding waste rubber powder resulted in a decrease in strength. In combination, the incorporation of waste seashell and powder typically improved the mechanical performance while significantly reducing shrinkage. Moreover, the life cycle assessment (LCA) revealed that BFRP composites incorporating waste materials demonstrated a significantly lower environmental impact compared to traditional epoxy and GFRP composites, particularly in terms of carbon emission and resource depletion. The cost analysis further underscored the economic viability of BFRP composites, especially in coastal regions where the procurement of traditional fillers is both costly and logistically challenging.
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