Macroscopic and Microscopic Properties of Alkali-Activated Slag Recycled Cementitious Material.

Alkali-activated slag recycled cementitious material (ASRCM) has emerged as a sustainable construction material alternative due to its potential for industrial byproduct valorization and reduced carbon footprint. To study the effect of recycled material content on ASRCM performance, this paper systematically investigates the optimal dosages of recycled stone powder, recycled rubber, and flax fiber in ASRCM with a controlled variable method. The synergistic effects of the inclusion of recycled stone powder, recycled rubber, and flax fiber on macro-microstructural properties on the ASRCM have been analyzed. The results show that the incorporation of recycled materials can significantly enhance both the mechanical properties and workability of the composite, thereby improving the overall stability and performance characteristics of the material system. However, challenges remain in standardizing recycled material reactivity assessment and mitigating long-term durability concerns. More research is needed to investigate the service life and field-scale implementation of ASRCM to accelerate circular economy transitions of the construction sector in the future.