Mechanical properties and leaching modeling of activated incinerator bottom ash in Portland cement blends
- Department of Hydraulics, Transportation and Roads, University of Rome 'La Sapienza', Rome (Italy)
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{sub 2} or CaSO{sub 4}, which were selected for the experimental campaign on the basis of the results from previous studies. The results indicated that CaCl{sub 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{sub 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 they were present in the materials in the form of complex minerals or phase assemblages for which no consistent thermodynamic data are presently available in the literature.
- OSTI ID:
- 21550339
- Journal Information:
- Waste Management, Vol. 31, Issue 2; Other Information: DOI: 10.1016/j.wasman.2010.05.021; PII: S0956-053X(10)00307-7; Copyright (c) 2010 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; ISSN 0956-053X
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
36 MATERIALS SCIENCE
12 MANAGEMENT OF RADIOACTIVE WASTES, AND NON-RADIOACTIVE WASTES FROM NUCLEAR FACILITIES
ASHES
CALCIUM CHLORIDES
CALCIUM SULFATES
CHEMICAL ACTIVATION
COPPER
ECONOMICS
GEOCHEMISTRY
HYDRATION
INCINERATORS
LEACHING
LEAD
MECHANICAL PROPERTIES
MINERALS
NICKEL
PORTLAND CEMENT
POTASSIUM HYDROXIDES
SODIUM HYDROXIDES
SOLUTIONS
TRACE AMOUNTS
ZINC
ALKALI METAL COMPOUNDS
ALKALINE EARTH METAL COMPOUNDS
BUILDING MATERIALS
CALCIUM COMPOUNDS
CALCIUM HALIDES
CEMENTS
CHEMISTRY
CHLORIDES
CHLORINE COMPOUNDS
COMBUSTION PRODUCTS
DISPERSIONS
DISSOLUTION
ELEMENTS
HALIDES
HALOGEN COMPOUNDS
HOMOGENEOUS MIXTURES
HYDROGEN COMPOUNDS
HYDROXIDES
MATERIALS
METALS
MIXTURES
OXYGEN COMPOUNDS
POTASSIUM COMPOUNDS
RESIDUES
SEPARATION PROCESSES
SODIUM COMPOUNDS
SOLVATION
SULFATES
SULFUR COMPOUNDS
TRANSITION ELEMENTS