Dissolution of the glassy phase in low-calcium fly ash during alkaline activation

Gangapatnam, V P Bhagath Singh and Ch, Subrahmanyam and K V L, Subramaniam (2018) Dissolution of the glassy phase in low-calcium fly ash during alkaline activation. Advances in Cement Research, 30 (7). pp. 313-322. ISSN 0951-7197

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An experimental investigation on the dissolution of low-calcium fly ashes in an alkaline solution is presented. Fly ashes collected directly from different sources are used in the study. Changes in the elemental concentrations in the solution are determined using optical emission spectroscopy and the residue is characterised using X-ray-based techniques. The increase in the concentration of ions in the alkaline solution is primarily associated with the dissolution of the glassy phase and the crystalline content of fly ash is largely unaffected by the alkaline exposure. The increase in the concentration of Si in the solution relative to the concentration of Al is not influenced by the solution molarity or the temperature. The glass that contains Ca is more reactive and dissolves earlier than the aluminosilicate glass present within the fly ash. The X-ray diffraction pattern of the fly ash glassy phase is adequately fit using a single pseudo-Voigt (PV) peak. The peak position of the PV fit is invariant of the dissolution of the glassy phase and an intensity-based measure of the X-ray diffraction analysis intensity pattern with the PV fit provides an accurate estimate of the undissolved glassy content present in the fly ash.

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IITH Creators:
IITH CreatorsORCiD
Ch, Subrahmanyamhttps://orcid.org/0000-0002-2643-3854
K V L, Subramaniamhttp://orcid.org/0000-0002-5995-0911
Item Type: Article
Uncontrolled Keywords: Open access content, Subscribed content, Free content, Trial content
Subjects: Chemistry
Civil Engineering
Divisions: Department of Chemistry
Depositing User: Team Library
Date Deposited: 12 Jul 2018 05:15
Last Modified: 12 Jul 2018 05:15
URI: http://raiith.iith.ac.in/id/eprint/4236
Publisher URL: http://doi.org/10.1680/jadcr.17.00170
OA policy: http://www.sherpa.ac.uk/romeo/issn/0951-7197/
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