Characterization of alkali-activated thermally treated incinerator bottom ash

X. C. Qiao; M. Tyrer; C. S. Poon; C. R. Cheeseman

doi:10.1016/j.wasman.2007.09.007

Characterization of alkali-activated thermally treated incinerator bottom ash

X. C. Qiao, M. Tyrer, C. S. Poon, C. R. Cheeseman

Research output: Contribution to journal › Article › peer-review

33 Citations (Scopus)

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.

Original language	English
Pages (from-to)	1955-1962
Number of pages	8
Journal	Waste Management
Volume	28
Issue number	10
Early online date	26 Nov 2007
DOIs	https://doi.org/10.1016/j.wasman.2007.09.007
Publication status	Published - 2008
Externally published	Yes

ASJC Scopus subject areas

Geotechnical Engineering and Engineering Geology
Management, Monitoring, Policy and Law
Pollution
Waste Management and Disposal

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title = "Characterization of alkali-activated thermally treated incinerator bottom ash",

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.",

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AU - Tyrer, M.

AU - Poon, C. S.

AU - Cheeseman, C. R.

PY - 2008

Y1 - 2008

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AB - 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.

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SN - 0956-053X

VL - 28

SP - 1955

EP - 1962

JO - Waste Management

JF - Waste Management

IS - 10

ER -

Characterization of alkali-activated thermally treated incinerator bottom ash

Abstract

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