Mechanical properties and leaching modeling of activated incinerator bottom ash in Portland cement blends

Waste Management
Roberta OnoriR Pomi

Abstract

In the present study the evolution of mechanical strength and the leaching behavior of major and trace elements from activated incinerator bottom ash/Portland cement mixtures were investigated. Chemical and mechanical activation were applied with the purpose of improving the reactivity of bottom ash in cement blends. Chemical activation made use of NaOH, KOH, CaCl(2) or CaSO(4), which were selected for the experimental campaign on the basis of the results from previous studies. The results indicated that CaCl(2) exhibited by far the best effects on the evolution of the hydration process in the mixtures; a positive effect on mechanical strength was also observed when CaSO(4) was used as the activator, while the gain in strength produced by KOH and NaOH was irrelevant. Geochemical modeling of the leaching solutions provided information on the mineral phases responsible for the release of major elements from the hardened materials and also indicated the important role played by surface sorption onto amorphous Fe and Al minerals in dictating the leaching of Pb. The leaching of the other trace metal cations investigated (Cu, Ni and Zn) could not be explained by any pure mineral included in the thermodynamic database used, suggesting...Continue Reading

References

Jul 3, 2002·Waste Management·Joris J DijkstraRob N J Comans
Mar 8, 2003·Waste Management·T SabbasUNKNOWN pHOENIX Working Group on Management of MSWI Residues
Jun 28, 2008·Journal of Hazardous Materials·Jiri HyksThomas H Christensen
Jul 18, 2008·Journal of Hazardous Materials·A PolettiniE Fortuna
Aug 23, 2008·Waste Management·X C QiaoC S Poon

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