Abstract: The smart reuse of waste as a driver of the circular economy involves studying and researching the incorporation of industrial waste as secondary raw materials in the production of new construction materials. In this work, Alkali-activated binders (AABs) incorporating waste/industrial by-products, Blast Furnace Slag (BFS)/Sewage Sludge Ash (SSA) as precursors, and biomass ashes Almond shell Ash (ABA)/Rice Husk Ash (RHA) as alkaline activators are studied. In order to determine the aspects that could condition the long-term behaviour of these materials in their service life, the relationship between the leaching using the Monolithic Dynamic Surface Leaching Test (CEN/TS 16637-2) and the microstructure, pore size distribution and morphology, before and after the leaching process, of monolithic AABs is evaluated. The results show correlation among the mobility of chemical elements (As, Cr, Mo and Sb) and pore quantity on the surface of AABs. The leaching process has an effect on the surface that increases the pore size and quantity. Therefore, a greater contact surface available with the leaching agent favours a greater release of trace contaminants, resulting the sample using conventional activators (M0) more affected than the AABs activated with biomass industrial by-products (M1 and M2).

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