Stabilization of Industrial By-Products in Mortars Containing Metakaolin

This study determines the possibility of reusing two industrial by-products for combustion processes (MSWIFA—Municipal Solid Waste Incineration Fly Ash and SSA—Sewage Sludge Ash) in cement-based materials containing metakaolin. The experimental program included tests on mortars to evaluate the impact of ternary binders (cement, metakaolin and residue) on the technological and environmental propert6ies of concrete intended for non-structural applications. The binders were composed of 75% cement, 22.5% metakaolin and 2.5% residue. Results of the technological and environmental behavior of mortars showed that the mechanical, dimensional and leaching properties were not affected by the residues. The use of metakaolin especially led to a significant decrease in soluble fractions and heavy metals released from the binder matrix.