Influence of modern coal-fired power technologies on fly ash properties and its use in concrete

Michael McCarthy (Lead / Corresponding author), Hamza I. Yakub, Laszlo Csetenyi

Research output: Contribution to journalArticle

1 Citation (Scopus)
170 Downloads (Pure)

Abstract

The work reported in this paper investigated the properties and use of fly ash (FA) produced from technologies developed to reduce the environmental impact and improve the efficiency of the coal-fired power generation process. These include nitrogen oxides (NO x) reduction, co-combustion, supercritical steam technology and oxy-fuel combustion. The nine FA samples examined from these technologies were characterised physically, chemically and in terms of their reactivity. Tests were also carried out to determine the consistence (slump) and compressive strength of FA concretes. Comparisons were made with a selection of reference FAs, the requirements of BS EN 450-1 and reported FA studies from the 1980s and 1990s. The results indicated that, for some technologies, the FA tended to be coarser and of higher loss on ignition (co-combustion and in-combustion NO x reduction) while, for others lower carbon contents were found (supercritical steam) or there was little obvious effect. FA chemistry was slightly affected in some cases, but mainly as expected for the coal being used. There was general agreement between water requirement and activity index with FA fineness for the materials tested. For the FA concretes, similar effects were noted in terms of the dosage of superplasticising admixture needed for a target slump and compressive strength. The behaviour of the materials from the new technologies was found to be similar to that reported in earlier studies on FA and suggests suitability for their use in concrete construction.

Original languageEnglish
Pages (from-to)435-447
Number of pages13
JournalAdvances in Cement Research
Volume31
Issue number10
Early online date26 Apr 2018
DOIs
Publication statusPublished - 1 Oct 2019

Keywords

  • cement/cementitious materials
  • chemical properties
  • compressive strength

Fingerprint Dive into the research topics of 'Influence of modern coal-fired power technologies on fly ash properties and its use in concrete'. Together they form a unique fingerprint.

  • Profiles

    No photo of Michael McCarthy

    McCarthy, Michael

    Person: Academic

    Cite this