Article In: cienciavitae, scopus, orcid

Mortars with alkali-activated municipal solid waste incinerator bottom ash and fine recycled aggregates

Journal of Cleaner Production

Casanova, S.; Silva, R.V.; Pereira, M.F.C.2021Elsevier

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:

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