Environmental impact and potential use of coal fly ash and sub-economical quarry fine aggregates in concrete

Roy Nir Lieberman, Yaniv Knop, Xavier Querol, Natalia Moreno, Carmen Muñoz-Quirós, Yitzhak Mastai, Yaakov Anker, Haim Cohen

Research output: Contribution to journalArticlepeer-review

33 Scopus citations

Abstract

The Israeli quarry industry produces 57 Mt of raw material and ∼4–6 Mt of associated sub-economical by-products annually. These sub-economical quarry fines are not used because production and transportation costs considerably exceed their retail value. Therefore these by-products, are stored in large piles of fine grain size particles, create environmental risks to their surrondings. This paper evaluates the possibility of mixing the sub-economical quarry by-products of two Israeli quarries with sub-economical Class F coal fly ash (<20 wt.% CaO) to form an economical aggregate sand substitute to be used as a concrete filler product. To study the feasibility of the aggregate as partial substitute to sand in concrete several analyses, including leaching experiements (EN12457-2), analytical techinques (SEM-EDX, ICP-MS, ICP-AES, and XRD), as well as an analysis of the mechanical and chemical properties of the concrete aggregate (strength, workability, and penetration) were performed. Scrubbing quarry waste with coal fly ash was found to be very effective for reducing the leaching rate of potentially harmful trace elements. In addition, adding fly ash with quarry fines as partial substitute to sand enhanced the performance of the concrete mixture and the properties of the fresh and harden concrete.

Original languageEnglish
Pages (from-to)1043-1056
Number of pages14
JournalJournal of Hazardous Materials
Volume344
DOIs
StatePublished - 15 Feb 2018

Keywords

  • Aggregates
  • Chemical scrubber
  • Fly ash
  • Quarry fines
  • Toxic trace elements
  • Trans-boundary pollution

ASJC Scopus subject areas

  • Environmental Engineering
  • Environmental Chemistry
  • Waste Management and Disposal
  • Pollution
  • Health, Toxicology and Mutagenesis

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