A Comparative Study On Compressive Strength Test Natural Aggregate Concrete (NAC) and Recycle Aggregate Concrete (RAC).

Abstract

Concrete is a mixture of cement, sand, natural aggregate and recycled concrete in some specified proportion which is generally used for R.C.C and C.C. We have worked on a comparative study about on compressive strength test natural and recycled concrete. Firstly, mixing (mix proportion 1:2:4) 100% recycle concrete, 100% natural aggregate, 50% natural aggregate and recycle, 25% natural aggregate 75% recycle and 75% natural aggregate 25% recycle concrete mixing 60th concrete cylinders of 4 x 8 inch were made. Total cylinder cured with laboratory water tank and sign every molding top mix proportion and date. In this study two different type coarse aggregate used to observe the difference affected concrete with various curing method. As the global construction industry seeks sustainable alternatives to mitigate the depletion of natural resources and manage demolition waste, Recycled Aggregate Concrete (RAC) has emerged as a viable solution. This research presents a comparative laboratory investigation into the compressive strength properties of conventional Natural Aggregate Concrete (NAC) and Recycled Aggregate Concrete (RAC) on evaluation. The experimental program involved replacing natural coarse aggregates with recycled concrete aggregates (RCA) at varying percentages: 25%, 50%, 75%, and 100%. Concrete cylinders of 4 x 8 inch cast for each mix ratio (1:2:4) and tested for axial compressive strength at curing ages of 7, 14, 21 and 28 days. The research concludes that while Natural Aggregate Concrete remains superior in high-load structural applications, Recycled Aggregate Concrete at partial replacement levels is an environmentally and technically feasible alternative for non-structural elements, pavements, and low-rise residential structures. Recommendations are provided for the use of mineral admixtures and adjusted water-cement ratios to optimize the performance of RAC in structural applications.