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Effect of Temperature and Humidity on the Synthesis of Alkali-Activated Binders Based on Bottom Ash from Municipal Waste Incineration

Author

Listed:
  • Pietro C. D. Tortora

    (Department of Engineering “Enzo Ferrari”, University of Modena and Reggio Emilia, 41125 Modena, Italy)

  • Alex Maldonado-Alameda

    (Departament de Ciència de Materials i Química Física, Universitat de Barcelona, 08028 Barcelona, Spain)

  • Jofre Mañosa

    (Departament de Ciència de Materials i Química Física, Universitat de Barcelona, 08028 Barcelona, Spain)

  • Alex C. Quintero-Payan

    (Departament de Ciència de Materials i Química Física, Universitat de Barcelona, 08028 Barcelona, Spain)

  • Cristina Leonelli

    (Department of Engineering “Enzo Ferrari”, University of Modena and Reggio Emilia, 41125 Modena, Italy)

  • Isabella Lancellotti

    (Department of Engineering “Enzo Ferrari”, University of Modena and Reggio Emilia, 41125 Modena, Italy)

  • Josep M. Chimenos

    (Departament de Ciència de Materials i Química Física, Universitat de Barcelona, 08028 Barcelona, Spain)

Abstract

Weathered bottom ash (WBA) from municipal solid waste incineration is a calcium aluminosilicate-rich material mainly used in construction and civil engineering as a secondary aggregate. However, its use is also being considered as a precursor in the manufacture of alkali-activated binders (AA-WBA). This preliminary research aimed to deepen understanding of the potential use of WBA (>8 mm fraction) as the sole precursor of alkali-activated binders. To gain better knowledge of this material, the physicochemical, mechanical, and environmental properties of AA-WBA binders were evaluated. In addition, the effect of curing temperature (25 °C, 45 °C, 65 °C, and 85 °C) and humidity conditions (oven and climate chamber) were assessed. The results of this study revealed that temperature and humidity conditions play a fundamental role during the early formation stages of AA-WBA binders. Maximum compactness and compressive strength (29.8 MPa) were obtained in the sample cured at 65 °C in the oven and room humidity. At higher temperatures (85 °C), a substantial decrease in mechanical strength (21.2 MPa) was observed due to a lower cohesion of the binder phases. Curing in the climate chamber led to an increase in humidity, and therefore a decrease in compressive strength. Finally, lower porosity and longer curing time substantially decreased the heavy metals and metalloid leaching concentration of AA-WBA binders.

Suggested Citation

  • Pietro C. D. Tortora & Alex Maldonado-Alameda & Jofre Mañosa & Alex C. Quintero-Payan & Cristina Leonelli & Isabella Lancellotti & Josep M. Chimenos, 2022. "Effect of Temperature and Humidity on the Synthesis of Alkali-Activated Binders Based on Bottom Ash from Municipal Waste Incineration," Sustainability, MDPI, vol. 14(3), pages 1-18, February.
    • Handle: RePEc:gam:jsusta:v:14:y:2022:i:3:p:1848-:d:743013
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    References listed on IDEAS

    as
    1. Polettini, A. & Pomi, R. & Carcani, G., 2005. "The effect of Na and Ca salts on MSWI bottom ash activation for reuse as a pozzolanic admixture," Resources, Conservation & Recycling, Elsevier, vol. 43(4), pages 403-418.
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