Article In: cienciavitae, scopus, orcid
Mortars with alkali-activated municipal solid waste incinerator bottom ash and fine recycled aggregates
Journal of Cleaner Production
2021 — Elsevier
—Key information
Authors:
Published in
03/20/2021
Abstract
Milled municipal solid waste incinerator bottom ash was used as a precursor in the production of alkaliactivated mortars with recycled concrete aggregates as a sand substitute. Fly ash was used as control precursor and sodium hydroxide as an alkaline activator. Different thermal curing regimens were used: 24 h in ambient conditions; 24 h/70 degrees C; 48 h/70 degrees C; and 24 h/90 degrees C. Mechanical and durability-related performances were evaluated (i.e. flexural and compressive strength, modulus of elasticity, ultrasonic pulse velocity, carbonation, capillary water absorption, and shrinkage). The reaction between metallic aluminium from municipal solid waste incinerator bottom ash and OH- ions produced hydrogen gas, causing expansion, porosity increase and thus decline in performance. Low stability in high relative humidity settings due to leaching of highly soluble compounds was also observed. A further decline in performance was observed in mixes containing recycled aggregates. Alkali activated municipal solid waste incinerator bottom ash presented fast carbonation but also a considerable strength enhancement.
Publication details
Authors in the community:
Rui Vasco Pacheco Santos da Silva
ist156561
Manuel Francisco Costa Pereira
ist13225
Publication version
AO - Author's Original
Publisher
Elsevier
Title of the publication container
Journal of Cleaner Production
Volume
289
ISSN
0959-6526
Fields of Science and Technology (FOS)
civil-engineering - Civil engineering
Keywords
- Municipal solid waste
- Incinerator bottom ash
- Alkali-activated materials
- Recycled aggregates
- Curing conditions
Publication language (ISO code)
eng - English
Alternative identifier (URI)
http://dx.doi.org/10.1016/j.jclepro.2020.125707
Rights type:
Open access
Creative Commons license
CC-BY - CC-BY