Characterization of alkali-activated thermally treated incinerator bottom ash
- Qiao, XC
- Tyrer, M
- Poon, CS
- Cheeseman, CR
DOIAbstract
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 ph...
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