The leachability of heavy metals in hardened fly ash cement and cement-solidified fly ash

Qijun Yu, S. Nagataki, Jinmei Lin, T. Saeki, M. Hisada

Research output: Contribution to journalArticlepeer-review

64 Citations (Scopus)

Abstract

The effect of mix proportion, leachant pH, curing age, carbonation and specimen making method etc. on the leaching of heavy metals and Cr(VI) in fly ash cement mortars and cement-solidified fly ashes has been investigated. In addition, a method for reducing the leaching of Cr(VI) from cement-solidified fly ashes is proposed. The results mainly indicate that: (1) either Portland cement or fly ash contains a certain amount of heavy and toxic metals, and the leaching of them from hardened fly ash incorporated specimens exists and is increased with fly ash addition and water to cement ratio; (2) the leachability of some heavy metals is greatly dependent on leachant pH; (3) when carbonation of cement mortars occurs the leaching of chromium ions is increased; (4) the amount of heavy metals leached from cement-solidified fly ashes depends more on the kind of fly ash than their contents in fly ash; and (5) with ground granulated blast furnace slag addition, the leaching of Cr(VI) from solidified fly ashes is decreased.

Original languageEnglish
Pages (from-to)1056-1063
Number of pages8
JournalCement and Concrete Research
Volume35
Issue number6
DOIs
Publication statusPublished - 2005 Jun 1
Externally publishedYes

Keywords

  • Cement
  • Fly ash
  • Heavy metals
  • Leaching
  • Toxic metal

ASJC Scopus subject areas

  • Building and Construction
  • Materials Science(all)

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