Journal
CONSTRUCTION AND BUILDING MATERIALS
Volume 364, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.conbuildmat.2022.130001
Keywords
Alkali-activated binders; Fluidised-bed incineration; Moving grate incineration; Municipal solid waste management systems; Waste-to-energy
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The use of incineration bottom ash (IBA) from fluidised bed (FB) combustion technology as a precursor for alkali-activated binders (AABs) was evaluated. IBA-FB was compared with IBA from moving grate (IBA-MG) combustion technology. The formulation of AABs using IBA-FB and IBA-MG was assessed from various perspectives, revealing differences in workability, consistency, porosity, and mechanical strength.
The novel formulation of alkali-activated binders (AABs) using incineration bottom ash (IBA) from fluidised bed (FB) combustion technology as a sole precursor was assessed. In addition, IBA-FB was compared with IBA from moving grate (IBA-MG) combustion technology. The AABs formulated with IBA-FB (AAB-FB) and IBA-MG (AAB-MG) were also evaluated from a physicochemical, mechanical, and environmental perspective. The results revealed that specific surface area in IBA-FB hinders the retention of kneading water of fresh pastes, affecting the workability, consistency, porosity, and mechanical strength of AAB-FB. Moreover, the low calcium content of IBA-FB requires that the formulated AABs must be cured at higher curing temperatures to ensure the formation of (N,C)ASH gels, while the high calcium content of IBA-MG promotes the formation of CSH gels at room temperature. The compressive strength results demonstrated that AAB-MG (approximate to 11 MPa) and AAB-FB (approximate to 8 MPa) could be used for non-structural purposes.
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