Effect of GGBFS slag on CSA-based ternary binder hydration, and concrete performance

Abstract

Calcium sulfo-aluminate (CSA) cement is an alternative cement that can be beneficial for precast, rapid, and low-temperature concrete construction. But low workability and impractically short setting time of CSA cement, prevent its application in the construction industry. The use of Portland cement (OPC) and ground granulated blast furnace slag (GGBFS) in CSA-based composite binder can provide improved workability, and setting time while maintaining early strength and low carbon footprint. This article studies the hydration process in a composite binder with CSA, GGBFS and OPC to identify the controlling reaction and chemical parameters that can be used to predict the concrete performance during the fresh and hardened state. As SCMs and alternative binders are being used more in construction, the hydration process and compatibility assessment of binders need to have a scientific basis instead of a trial-and-error process.