Hydrothermal reaction of fly ash. Final report

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The reactions which occur when fly ash is treated under hydrothermal conditions were investigated. This was done for the following primary reasons. The first of these is to determine the nature of the phases that form to assess the stabilities of these phases in the ambient environment and, finally, to assess whether these phases are capable of sequestering hazardous species. The second reason for undertaking this study was whether, depending on the composition of the ash and the presence of selected additives, it would be possible under hydrothermal conditions to form compounds which have cementitious properties. Formation of four classes ... continued below

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11 p.

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Brown, P. W. December 1994.

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This report is part of the collection entitled: Office of Scientific & Technical Information Technical Reports and was provided by UNT Libraries Government Documents Department to Digital Library, a digital repository hosted by the UNT Libraries. It has been viewed 17 times . More information about this report can be viewed below.

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  • Pennsylvania State University
    Publisher Info: Pennsylvania State Univ., University Park, PA (United States)
    Place of Publication: University Park, Pennsylvania

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Description

The reactions which occur when fly ash is treated under hydrothermal conditions were investigated. This was done for the following primary reasons. The first of these is to determine the nature of the phases that form to assess the stabilities of these phases in the ambient environment and, finally, to assess whether these phases are capable of sequestering hazardous species. The second reason for undertaking this study was whether, depending on the composition of the ash and the presence of selected additives, it would be possible under hydrothermal conditions to form compounds which have cementitious properties. Formation of four classes of compounds, which bracket likely fly ash compositional ranges, were selected for study. The classes are calcium silicate hydrates, calcium selenates, and calcium aluminosulfates, and silicate-based glasses. Specific compounds synthesized were determined and their stability regions assessed. As part of stability assessment, the extent to which selected hazardous species are sequestered was determined. Finally, the cementing properties of these compounds were established. The results obtained in this program have demonstrated that mild hydrothermal conditions can be employed to improve the reactivity of fly ash. Such improvements in reactivity can result in the formation of monolithic forms which may exhibit suitable mechanical properties for selected applications as building materials. If the ashes involved are considered hazardous, the mechanical properties exhibited indicated the forms could be handled in a manner which facilitates their disposal.

Physical Description

11 p.

Notes

OSTI as DE96013922

Source

  • Other Information: PBD: [1994]

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  • Other: DE96013922
  • Report No.: DOE/PC/91302--T1
  • Grant Number: FG22-91PC91302
  • DOI: 10.2172/369604 | External Link
  • Office of Scientific & Technical Information Report Number: 369604
  • Archival Resource Key: ark:/67531/metadc684995

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  • December 1994

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  • July 25, 2015, 2:20 a.m.

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  • Feb. 20, 2017, 1:17 p.m.

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Brown, P. W. Hydrothermal reaction of fly ash. Final report, report, December 1994; University Park, Pennsylvania. (digital.library.unt.edu/ark:/67531/metadc684995/: accessed September 25, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.