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Leaching from solid waste incineration ashes used in cement-treated base layers for pavements
Z Cai1, Dirch H Bager, T H Christensen
1Environment & Resources DTU, Technical University of Denmark, Building 115, DK-2800 Lyngby, Denmark.
Waste Management (New York, N.Y.)
|June 29, 2004
Summary
Waste incineration residue, when mixed with cement, shows sufficient strength for road base layers. However, higher leaching of metals and salts necessitates careful, case-by-case evaluation for dedicated uses.
Area of Science:
- Environmental Science
- Materials Science
- Civil Engineering
Background:
- Waste incineration generates bottom ash and flue gas cleaning products, posing disposal challenges.
- Utilizing these residues in construction materials can offer a sustainable alternative to landfilling.
Purpose of the Study:
- To evaluate the mechanical strength and leaching characteristics of waste incineration residue mixed with cement.
- To determine the suitability of this composite material for applications like road base layers.
Main Methods:
- Laboratory testing of compressive strength and tank leaching over 64 days.
- Comparison of incineration-residue-based specimens with reference concrete.
Main Results:
- The material exhibited lower compressive strength than reference concrete but sufficient for road base layers.
- Incineration residue specimens showed significantly higher leaching of Cl, Na, K, Ca, SO4, Cu, Cd, Pb, and Zn compared to reference concrete.
- Enhanced chemical retention limited heavy metal leaching in residue-based specimens, though overall leaching was higher.
Conclusions:
- Waste incineration residue-cement mixtures can be used for road base layers, but with limitations.
- The increased leaching of various constituents requires careful consideration and case-by-case assessment for specific applications.
- Absence of current leaching criteria for monolithic materials necessitates individualized evaluations.