Impact of electrodialytic remediation of MSWI fly ash on hydration and mechanical properties of blends with Portland cement

• DOI: 10.1016/j.conbuildmat.2021.125193
• Publication Date: 2021-10-14T05:32:16Z
• Authors: Benjamin A.R. Ebert; Mette R. Geiker; Wolfgang Kunther; Gunvor M. Kirkelund
• Keywords: Ettringite; Cementitious; Inert

Municipal solid waste incineration (MSWI) residues such as fly ash and air pollution control (APC) may serve new supplementary cementitious materials (SCM). These SCMs may, however, require a pre-treatment to improve material properties. This study investigates the impact of electrodialytically remediated (EDR) MSWI remove heavy metals salts, on phase development, setting, compressive strength development composite cements with 10 wt% cement replacement, compared inert quartz or untreated (raw) residues. All treated showed reactivity in mortar, resulting higher than quartz, attributed additional ettringite monocarbonate formation. The results indicate that electrodialytical remediation improves performance blends Portland cement, while APC might be used without pre-treatment.