Please use this identifier to cite or link to this item:
http://hdl.handle.net/2445/167640
Title: | Municipal solid waste incineration bottom ash as sole precursor in the alkali-activated binder formulation |
Author: | Maldonado Alameda, Alex Giró Paloma, Jessica Alfocea Roig, Anna Formosa Mitjans, Joan Chimenos Ribera, Josep Ma. |
Keywords: | Residus Incineració Eliminació de residus Waste products Incineration Refuse and refuse disposal |
Issue Date: | 16-Jun-2020 |
Publisher: | MDPI |
Abstract: | The concern about the large amount of weathered bottom ash (WBA) produced in waste-to-energy plants (WtE) has caused an increased search for alternatives to reduce their environmental impact. The present study aims to provide an added value through the WBA valorization from municipal solid waste incineration (MSWI) for its use as a sole precursor for developing alkali-activated binders (AABs). Alkali-activated weathered bottom ash binders (AA-WBA) were formulated with a liquid-to-solid ratio of 1.0 and using sodium silicate (80 wt.%) and NaOH (20 wt.%) at different concentrations (2, 4, 6, and 8M) as alkali-activator solutions. AA-WBA were cured at room temperature to extend their applicability. The effect of the alkali-activator solution molarity on the final properties of the AA-WBA was evaluated. The physicochemical characterization by XRD, FTIR, and SEM evidenced the presence of the typical phases (calcium silicate hydrate and gehlenite) of C-(A)-S-H gel. Leaching concentrations of As, Cu, and Mo exceed the acceptance in landfills for inert waste, while the leaching concentration of Sb exceeds the one for non-hazardous waste. The structure of the binders depends on the alkalinity of the activator, obtaining better results using NaOH 6M in terms of microstructure and compressive strength (6.7 MPa). The present study revealed that AA-WBA for non-structural purposes can be obtained. The AA-WBA formulation contributes to the WBA valorization and development of low-carbon cements; therefore, it is an encouraged alternative to ordinary Portland cement (OPC). Considering the amounts and costs of the WBA, sodium silicate, NaOH, and wate |
Note: | Reproducció del document publicat a: https://doi.org/10.3390/app10124129 |
It is part of: | Applied Sciences, 2020, vol. 10, num. 12, p. 4129 |
URI: | http://hdl.handle.net/2445/167640 |
Related resource: | https://doi.org/10.3390/app10124129 |
ISSN: | 2076-3417 |
Appears in Collections: | Articles publicats en revistes (Ciència dels Materials i Química Física) |
Files in This Item:
File | Description | Size | Format | |
---|---|---|---|---|
702497.pdf | 4.19 MB | Adobe PDF | View/Open |
This item is licensed under a
Creative Commons License