MgO-Activated Materials: Sustainable Cement Alternative

In recent decades, MgO-based cement has gained attention due to its environmental benefits. It requires less energy than Portland cement, as it needs lower temperatures to transform MgO, making it a potential eco-friendly alternative. Additionally, MgO can absorb CO2 to form carbonates and bicarbonates, positioning it as a candidate for “carbon-neutral” cement that could offset its CO2 emissions. The chapter discusses the use of reactive magnesia as an activator for slag and provides a detailed review of MgO-activated cementitious materials. It covers the both macro- and micro-performances such as compressive strength, drying shrinkage, hydration products, microstructure, and the mechanisms. This chapter also examines the evolution of these characteristics under specific conditions and critically assesses the limitations and application viability of these cementing materials.