Review Study on Compressive Strength of Concrete using Coconut Coir and Recycled Aggregate

This study investigates the feasibility of incorporating recycled coarse aggregates and coconut coir fibers into concrete to increase sustainability and structural performance. The study looks at how recycled materials and natural fibers affect the workability and mechanical qualities of concrete, namely compressive and flexural strength. Experimental trials were carried out on concrete samples with varied RCA proportions (ranging from 0% to 100% in 10% increments) and a fixed coconut coir fiber content of 1% by cement weight, with fiber dimensions of 60 mm in length and 0.35 mm in diameter. Concrete cubes and beams were cast and tested under normal loading conditions. RCA was sourced from buildings aged 7, 13, 21, and 62 years to assess the association between source age and aggregate performance. Test results showed that concrete with 20% RCA substitution had the highest compressive and flexural strength, indicating an optimal mix of sustainability and mechanical performance. Key Words: Recycled Aggregate (RCA), Coconut Coir Fibers, Compressive Strength, Flexural Strength, Sustainable Concrete.