Journal
CEMENT & CONCRETE COMPOSITES
Volume 99, Issue -, Pages 175-180Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.cemconcomp.2019.03.014
Keywords
Municipal solid waste; Incineration bottom ash; Alkali activation; Aluminosilicate gel; Nuclear magnetic resonance; Spectral subtraction
Funding
- Environment Technology Research Programme [ETRP 1301 104]
- National Environment Agency of Singapore
- SinBerBEST
- National Research Foundation of Singapore
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It has been reported that incineration bottom ash (IBA) from municipal solid waste can be a potential precursor for the synthesis of alkali-activated materials. It has been reported that the resulting alkali-activated IBA (AA-IBA) binder consists of 20 wt% calcium-containing phases. It is expected that aluminosilicate phases may coexist in the complex AA-IBA binder. Differentiating aluminosilicate phases from C-(A)-S-H phases could be challenging, for in general the two phases largely overlap in the spectra. In this study, aluminosilicate gels in a complex AA-IBA are separated and quantitatively characterized based on sequential chemical extractions, thermogravi-metric analysis and nuclear magnetic resonance spectral subtraction and deconvolution. It concludes that the resulting AA-IBA binder consists of 17 wt% aluminosilicate gel with a Si/Al ratio of 2.52 resembling an aged alkali-activated coal fly ash. As understanding gel compositions in a binder is important, the methodology developed in this study is of significance and would benefit the development of alternative binders incorporating solid wastes and industry by-products.
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