Green and Low-Carbon Alkali-Activated Materials Synthesized by Multiple Industrial Solid Wastes: Effects of Coupling Relation and Curing Regime

Alkali-activated materials has being one of the most viable option in solution of the issue of industrial solid wastes. In this work, blended AAMs based on coupling system of multi-ISWs using lithium slag as major ingredient are prepared under different curing regime to evaluate the setting behavior, compressive strength, microscopic characteristics, and the coupling relation both in physics and chemistry during the geopolymerization. Results reveal that the AAMs prepared with multi-ISWs coupling system of 50% lithium slag, 35% fly ash, 5% silica fume and 10% slag is feasible and practicable. Nucleation of hydration gels on the surface of inert grains as well as elevated curing temperature are identified to improve the hydration degree of aluminosilicate precursors and the formation of highly cohesive gels network. The coexistence of N-A-S-H and C-A-S-H gels caused by the synergy effect of multi-ISWs refine the matrix and homogenise the microstructure, resulting in the excellent macro-performance.