Development of Sustainable Concrete from Blast Furnace Slag and Recycled Concrete Sand

Abstract

In recent years, higher demand for urbanization has led to more materials and assets. In the construction industry, the use of concrete is increasing day to day. But the problem is its higher cost and leads to CO2 emission. The application of waste materials in cement and sand replacement is the main area of concern. In this study, the behavior of normal concrete (M25) cast with a mixture of blast furnace slag aggregate (BFSA) and fine aggregate (FA) replacement by 0, 5, 15, 25, 35, and 50% as coarse aggregate (CA) and recycled concrete sand (RCS) with 0, 10, 25, 50, 75, and 100%, respectively. The workability, compressive strength (CS), splitting tensile strength (STS) and flexural strength (FS), water absorption, and air permeability have been evaluated. It has been confirmed that an increase in replaced content up to 100 % reduces the CS of concrete, but; at the 35% replacement, it shows good performance for BFSA. Substitution of FA with RCS at varying amounts has a detrimental impact on the concrete strength. Concrete containing RCS at 25% sand replacement has more excellent CS than the control mix.