Strength Performance Study of Concrete with Partial Replacement of Sand with ROBO SAND and Cement with GGBS

This study aims at replacing sand and cement with ROBO sand and ground granulated blast furnace slag (GGBS) in the concrete mix. Here, GGBS and ROBO sand are chemically and physically characterized and used to replace cement and sand in different proportions. Tests on workability were conducted for fresh concrete, various strength tests were conducted for hardened M30 grade of concrete, and a comparative study was done with normal concrete and composite concrete with GGBS and ROBO sand in different proportions. Increase in compressive strength after 28 days was observed with 15% GGBS along with 20% ROBO sand. Similar trend was observed in the case of split tensile strength and flexural strength test.