Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/22007
Title: Characterization of alkali-activated thermally treated incinerator bottom ash
Authors: Qiao, XC
Tyrer, M
Poon, CS 
Cheeseman, CR
Issue Date: 2008
Publisher: Pergamon Press
Source: Waste management, 2008, v. 28, no. 10, p. 1955-1962 How to cite?
Journal: Waste management 
Abstract: The fine fraction (<14 mm) of incinerator bottom ash (IBA) obtained from a UK energy from waste plant has been milled and thermally treated at 600, 700, 800 and 880 °C. Treated materials have been activated with Ca(OH)2 (10 wt%) and the setting times and compressive strengths at different curing times measured. In addition to decomposition of CaCO3 to CaO, thermal treatment increases the content of gehlenite (Ca2Al2SiO7), wollastonite (CaSiO3) and mayenite (Ca12Al14O33). Thermally treated samples were significantly more reactive than milled IBA and heating to 700 °C produced a material which rapidly set. Silica, gehlenite and wollastonite were the main crystalline phases present in hydrated samples and a mixed sulphate–carbonate AFm-type phase (Ca4Al2O6(CO3)0.67(SO3)0.33 · 11H2O) formed. Significant volumes of gas were generated during curing and this produced a macro-porous microstructure that limited strength to 2.8 MPa. The new materials may have potential for use as controlled low-strength materials.
URI: http://hdl.handle.net/10397/22007
ISSN: 0956-053X
DOI: 10.1016/j.wasman.2007.09.007
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