Application of washed MSWI fly ash in cement composites

long-term environmental impacts

Zhenzhou Yang, Sicong Tian, Lili Liu, Xidong Wang, Zuotai Zhang*

*Corresponding author for this work

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

In the present study, long-term environmental impacts of compact and ground cement composites, in which 30 wt.% of cement was replaced by washed municipal solid wastes incineration (MSWI) fly ash, were investigated for use in building industry. Consecutive leaching tests over a time span of 180 days were performed in acid water, deionized water, and saline water, respectively, with the accumulative concentration of different elements determined in the leachate. Different leaching behaviors are observed among different potential toxic elements (PTEs). For instance, higher concentrations of V in the leachate were observed from the compact cement composites than those from the ground ones. The concentration of Ba in the leachate increased with the decrease of particle size of the cement composites, and an initial increase in the leaching efficiency of Sn was followed by a clear decline with the leaching time. In addition, kinetic study revealed that the leaching behaviors of potential toxic elements follow a second-order model. The results demonstrated that the addition of washed MSWI fly ash into cement can contribute to the attrition resistance, indicating that the washed MSWI fly ash could be a promising alternative for cement as supplementary building materials.

Original languageEnglish
Pages (from-to)12127-12138
Number of pages12
JournalEnvironmental Science and Pollution Research
Volume25
Issue number12
Early online date17 Feb 2018
DOIs
Publication statusPublished - Apr 2018

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Keywords

  • Washed MSWI fly ash
  • Long-termleaching
  • Potential toxic element
  • Kinetic study

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