Characterization of calcium-containing phases in alkali-activated municipal solid waste incineration bottom ash binder through chemical extraction and deconvoluted Fourier transform infrared spectra. (10th August 2018)

• Record Type: Journal Article
• Authors: Zhu, Weiping; Chen, Xu; Struble, Leslie J.; Yang, En-Hua
• Is Part Of: Journal of cleaner production. Volume 192(2018)
• Page Start: 782
• Page End: 789
• Publication Date: 2018-08-10
• Subjects: Alkali activation -- Municipal solid waste incineration bottom ash -- Calcium silicate hydrate -- Fourier transform infrared spectroscopy -- Spectral subtraction -- Deconvolution; Factory and trade waste -- Management -- Periodicals; Manufactures -- Environmental aspects -- Periodicals; Déchets industriels -- Gestion -- Périodiques; Usines -- Aspect de l'environnement -- Périodiques; 628.5
• DOI: 10.1016/j.jclepro.2018.05.049
• Languages: English
• ISSNs: 0959-6526

Abstract

Abstract: It has been reported that municipal solid waste incineration bottom ash (IBA) can be a potential precursor for alkali-activated materials (AAM). This study investigates chemical composition and structure of calcium-containing phases in an alkali-activated IBA (AA-IBA) binder by a novel combination of selective chemical extraction and Fourier transform infrared (FTIR) spectral subtraction and deconvolution. Salicylic acid/methanol extraction is used to isolate the calcium-containing phases from the AA-IBA binder. X-ray powder diffraction and FTIR spectroscopy are used for sample characterization. Spectral subtraction is carried out to assign FTIR peaks of calcium-containing phases and deconvolution is used to discover various individual Si-O peaks hidden in the single broad FTIR peak. Results show that the AA-IBA consists of about 20 wt.% calcium silicate hydrate (C-S-H) and pirssonite (Na2 Ca(CO3 )2 ·2H2 O). Chemical structure of the C-S-H in AA-IBA is found to be broadly similar to that in aged Portland cement paste, with possibly a higher degree of polymerization of the silicate chains. The methodology established in this study is significant and can greatly benefit the development of sustainable construction materials because many industry by-products and solid wastes are Si and/or Al rich, which could be potential AAM precursor. Graphical abstract: Image Highlights: IBA as the sole AAM precursor. SAM to extract calcium-containing phase in IBA AAM. FTIR subtraction and deconvolution for calcium-containing phase characterization. IBA AAM binder consists of 20 wt.% C-S-H and pirssonite.