Influence of Modern Coal-fired Power Technologies on Fly Ash Properties and Use in Concrete

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

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Abstract

The Paper investigates the properties and use of fly ash produced from technologies developed to reduce environmental impact/improve efficiency of the coal-fired power generation process. These include, NOx reduction, co-combustion, supercritical steam technology and oxy-fuel combustion. The nine samples examined were characterized physically, chemically and in terms of their reactivity. Tests were also carried out for consistence and compressive strength of concrete. Comparisons were made with (i) a selection of reference fly ashes, (ii) the requirements of EN 450-1 and (iii) fly ash studies from the 1980s and 1990s. The results indicate that for some processes, fly ash tended to be coarser and of higher loss-on-ignition (co-combustion and in-combustion NOx reduction), while for others lower carbon contents were found (supercritical steam), or there was little obvious effect. Fly ash 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 fly ash fineness. Similar effects were noted with concrete in terms of superplasticizing admixture dose for a target slump and compressive strength. The behaviour of the materials was similar to that from the earlier studies and suggests suitability for 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 - Nov 2019

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Coal Ash
Coal
Fly ash
Concretes
Steam
Compressive strength
Concrete construction
Power generation
Environmental impact
Ignition
Carbon
Water

Keywords

  • cement/cementitious materials
  • chemical properties
  • compressive strength

Cite this

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title = "Influence of Modern Coal-fired Power Technologies on Fly Ash Properties and Use in Concrete",
abstract = "The Paper investigates the properties and use of fly ash produced from technologies developed to reduce environmental impact/improve efficiency of the coal-fired power generation process. These include, NOx reduction, co-combustion, supercritical steam technology and oxy-fuel combustion. The nine samples examined were characterized physically, chemically and in terms of their reactivity. Tests were also carried out for consistence and compressive strength of concrete. Comparisons were made with (i) a selection of reference fly ashes, (ii) the requirements of EN 450-1 and (iii) fly ash studies from the 1980s and 1990s. The results indicate that for some processes, fly ash tended to be coarser and of higher loss-on-ignition (co-combustion and in-combustion NOx reduction), while for others lower carbon contents were found (supercritical steam), or there was little obvious effect. Fly ash 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 fly ash fineness. Similar effects were noted with concrete in terms of superplasticizing admixture dose for a target slump and compressive strength. The behaviour of the materials was similar to that from the earlier studies and suggests suitability for use in concrete construction.",
keywords = "cement/cementitious materials, chemical properties, compressive strength",
author = "Michael McCarthy and Yakub, {Hamza I.} and Laszlo Csetenyi",
note = "Acknowledgement is given to the Engineering and Physical Science Research Council (Doctoral Training Award) and UK Quality Ash Association and its members for funding the research described. The helpful technical input and suggestions by Drs Robert Carroll and Lindon Sear during the project are also greatly appreciated.",
year = "2019",
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AU - Yakub, Hamza I.

AU - Csetenyi, Laszlo

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PY - 2019/11

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N2 - The Paper investigates the properties and use of fly ash produced from technologies developed to reduce environmental impact/improve efficiency of the coal-fired power generation process. These include, NOx reduction, co-combustion, supercritical steam technology and oxy-fuel combustion. The nine samples examined were characterized physically, chemically and in terms of their reactivity. Tests were also carried out for consistence and compressive strength of concrete. Comparisons were made with (i) a selection of reference fly ashes, (ii) the requirements of EN 450-1 and (iii) fly ash studies from the 1980s and 1990s. The results indicate that for some processes, fly ash tended to be coarser and of higher loss-on-ignition (co-combustion and in-combustion NOx reduction), while for others lower carbon contents were found (supercritical steam), or there was little obvious effect. Fly ash 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 fly ash fineness. Similar effects were noted with concrete in terms of superplasticizing admixture dose for a target slump and compressive strength. The behaviour of the materials was similar to that from the earlier studies and suggests suitability for use in concrete construction.

AB - The Paper investigates the properties and use of fly ash produced from technologies developed to reduce environmental impact/improve efficiency of the coal-fired power generation process. These include, NOx reduction, co-combustion, supercritical steam technology and oxy-fuel combustion. The nine samples examined were characterized physically, chemically and in terms of their reactivity. Tests were also carried out for consistence and compressive strength of concrete. Comparisons were made with (i) a selection of reference fly ashes, (ii) the requirements of EN 450-1 and (iii) fly ash studies from the 1980s and 1990s. The results indicate that for some processes, fly ash tended to be coarser and of higher loss-on-ignition (co-combustion and in-combustion NOx reduction), while for others lower carbon contents were found (supercritical steam), or there was little obvious effect. Fly ash 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 fly ash fineness. Similar effects were noted with concrete in terms of superplasticizing admixture dose for a target slump and compressive strength. The behaviour of the materials was similar to that from the earlier studies and suggests suitability for use in concrete construction.

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