Construction material properties of slag from the high temperature arc gasification of municipal solid waste

•Physical properties of slag from high temperature arc gasification of MSW tested.•Slag demonstrated high resistance to fracture and low reactivity.•Compaction and bearing capacity testing results above those for WTE bottom ash.•Mineralogical evaluation demonstrated potential for self-cementation.•L...

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Bibliographic Details
Published in:Waste management (Elmsford) 2016-06, Vol.52, p.169-179
Main Authors: Roessler, Justin G., Olivera, Fernando D., Wasman, Scott J., Townsend, Timothy G., McVay, Michael C., Ferraro, Christopher C., Blaisi, Nawaf I.
Format: Article
Language:English
Subjects:
Abrasion resistance
Aggregates
Beneficial use
Construction Materials
Gasification
Hot Temperature
Incineration - methods
Municipal waste management
Plasma arc
Slag
Slags
Solid waste management
Waste management
Waste to energy
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Summary:•Physical properties of slag from high temperature arc gasification of MSW tested.•Slag demonstrated high resistance to fracture and low reactivity.•Compaction and bearing capacity testing results above those for WTE bottom ash.•Mineralogical evaluation demonstrated potential for self-cementation.•Longer term and field scale testing of material needs to be conducted. Slag from the high temperature arc gasification (HTAG) of municipal solid waste (MSW) was tested to evaluate its material properties with respect to use as a construction aggregate. These data were compared to previously compiled values for waste to energy bottom ash, the most commonly produced and beneficially used thermal treatment residue. The slag was tested using gradations representative of a base course and a course aggregate. Los Angeles (LA) abrasion testing demonstrated that the HTAG slag had a high resistance to fracture with a measured LA loss of 24%. Soundness testing indicated a low potential for reactivity and good weathering resistance with a mean soundness loss of 3.14%. The modified Proctor compaction testing found the slag to possess a maximum dry density (24.04kN/m3) greater than conventionally used aggregates and WTE BA. The LBR tests demonstrated a substantial bearing capacity (>200). Mineralogical analysis of the HTAG suggested the potential for self cementing character which supports the elevated LBR results. Preliminary material characterization of the HTAG slag establishes potential for beneficial use; larger and longer term studies focusing on the material’s possibility for swelling and performance at the field scale level are needed.
ISSN:0956-053X
1879-2456
DOI:10.1016/j.wasman.2016.03.031