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The effect of Na and Ca salts on MSWI bottom ash activation for reuse as a pozzolanic admixture

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  • Polettini, A.
  • Pomi, R.
  • Carcani, G.

Abstract

In this study the possibility of both chemical and combined chemical + thermal activation of municipal solid waste incinerator bottom ash was investigated. A number of chemical activators including Na2SiO3·9H2O, NaOH, Na2SO4 and CaCl2·2H2O were individually added at varying concentrations to bottom ash/Portland cement mixtures having different bottom ash contents. The effect of the selected compounds was evaluated in terms of macroscopic properties including mechanical strength and composition of cementitious materials/water slurries. The results showed that Na-based activators were not capable of improving the characteristics of the cementitious products if compared to Portland cement under both normal and accelerated curing. Conversely, the use of calcium chloride at 40°C-curing did promote the pozzolanic properties of bottom ash, leading to UCS values of 45.5 and 60.0MPa after 10 and 20 days, respectively, as opposed to a value of 43.6MPa obtained after 28 days for Portland cement under normal curing conditions.

Suggested Citation

  • 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.
    • Handle: RePEc:eee:recore:v:43:y:2005:i:4:p:403-418
    DOI: 10.1016/j.resconrec.2004.07.004
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    Cited by:

    1. Yingzun He & Monika Kasina, 2023. "The Sequential Extraction of Municipal Solid Waste Incineration Bottom Ash: Heavy Metals Mobility and Sustainable Application of Ashes," Sustainability, MDPI, vol. 15(19), pages 1-15, October.
    2. Qiao, X.C. & Tyrer, M. & Poon, C.S. & Cheeseman, C.R., 2008. "Novel cementitious materials produced from incinerator bottom ash," Resources, Conservation & Recycling, Elsevier, vol. 52(3), pages 496-510.
    3. 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.

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