Recycled mixed aggregates (RMAs) are comprised of a blend of various demolished construction materials, including concrete, bricks, ceramics, and sometimes asphalt, repurposed for new construction applications. These aggregates are produced through processes that involve collection, sorting, crushing, and screening of construction waste. The presence of different material types contributes to a complex mix with variable properties, such as size distribution, composition, and contaminant levels. The heterogeneity of recycled mixed aggregates affects their chemical and physical interactions with cement, influencing the hydration process and the microstructure of the concrete.