Circulating fluidized bed combustion ash as controlled low-strength material (CLSM) by alkaline activation

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The present study is aimed at providing a useful means of treating and utilizing the CFBC ash as controlled low-strength material (CLSM). The CLSM in this study was produced by activating a mixture of CFBC fly ash, bottom ash and blast furnace slag with sodium hydroxide (NaOH) solution. The characteristics of the CLSM were evaluated by the main factors such as flow, bleeding and compressive strength as stated in ACI 229, along with initial setting time and XRD patterns. The CLSM showed delayed strength. development due to the reactivity of calcium sulfate in CFBC fly ash and bottom ash. This effect is evidenced by the XRD pattern of the CLSM at 7 and 56 d which showed the consumption of gypsum as a source of calcium sulfate, to produce the reaction product ettringite.
Publisher
ELSEVIER SCI LTD
Issue Date
2017-11
Language
English
Article Type
Article
Citation

CONSTRUCTION AND BUILDING MATERIALS, v.156, pp.728 - 738

ISSN
0950-0618
DOI
10.1016/j.conbuildmat.2017.09.001
URI
http://hdl.handle.net/10203/227202
Appears in Collection
CE-Journal Papers(저널논문)
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