Evaluation of the microstructure, mechanical, and durability properties of alkali-activated slag-based mortar with light-burnt dolomite powder

Abstract

In this study, light-burnt dolomite powder was substituted for up to 20% of ground granulated blast-furnace slag in sodium sulfate-activated slag systems. The effects of light-burnt dolomite incorporation on compressive strength were investigated. Mineralogical analysis included XRD and FT-IR. Microstructure analysis included MIP and SEM examination. The durability properties, including carbonation depth and chloride penetration, were also investigated. The results indicate that the inclusion of LBD enhanced hydrotalcite and calcite formation and resulted in dense microstructures. All specimens with LBD had better mechanical and durability properties than did mixtures without LBD. Compared with 10% LBD incorporation, 20% LBD incorporation had fewer negative effects on mechanical and durability properties.

Keywords

• Alkali-activated slag
• Sodium sulfate
• Light-burnt dolomite
• Microstructure
• Durability