Shotcrete is a widely used construction material known for its rapid application and high strength. It contains high amounts of cement, a source of greenhouse gas emissions. SCM can be used to reduce the environmental impact of shotcrete by replacing amounts of cement in the mix. This can affect the strength properties of shotcrete. A pilot study is set to investigate the effect of replacing cement with slag on compressive strength for the first 24 hours. Using the stud driving method and cast cubes, the study showed reduced compressive capacity for the first few hours.