Beneficiation of stockpiled fluidized bed coal ash in road base course construction

Gleb G. Mejeoumov, Chang Seon Shon, Don Saylak, Cindy K. Estakhri

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)

Abstract

The presented paper investigates the potential for the utilization of unprocessed, as excavated (i.e. unground), stockpiled coal combustion fluidized bed ash in road base course construction. In addition to functioning as a stabilizer of the fines in the stockpiled material, this ash also permits treating the stockpiled ash agglomerates as an aggregate. Both untreated and cement-treated mix designs were evaluated. The laboratory program included unconfined strength measurements, triaxial, volumetric swell, and moisture susceptibility testing protocols performed on cylindrical specimens compacted at their optimum moisture content. The results have shown that, without breaking down the agglomerates by grinding, the unstabilized stockpiled ash possesses very little residual cementitious activity; whereas, if treated with small amounts of cement (3%), it meets the required strength criteria for cement-treated base courses while minimizing the volumetric swell characteristics.

Original languageEnglish
Pages (from-to)2072-2078
Number of pages7
JournalConstruction and Building Materials
Volume24
Issue number11
DOIs
Publication statusPublished - Nov 1 2010

Keywords

  • Base course construction
  • Circulating fluidized bed combustion ash
  • Stockpiled ash

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Building and Construction
  • Materials Science(all)

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