Control of geopolymer properties by grinding of land filled fly ash

Mucsi, Gabor and Kumar, Sanjay and Csoke, Barnabás and Kumar, Rakesh and Molnár, Zoltán and Rácz, Ádám and Mádai , Ferenc and Debreczeni , Ákos (2015) Control of geopolymer properties by grinding of land filled fly ash. International Journal of Mineral Processing, 143 (IF-1.31). pp. 50-58.

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This paper is focused on the investigation of a land filled Hungarian fly ash (Tiszaújváros dumpsite) as a main component of geopolymer. After determination of the fly ash properties such as particle size distribution, moisture content, real and bulk density and specific surface area, mechanical activation by fine grinding of the fly ash sample was performed in laboratory scale ball mill, vibratory mill and stirred media mill in order to improve its reactivity. Grinding kinetics was determined in each mill. The geopolymer cylindrical specimens were prepared and their uniaxial compressive strength was measured. The structure of the fly ash and the geopolymer was monitored by Fourier Transform Infrared Spectroscopy (FTIR) and X-ray diffraction (XRD); furthermore, the morphology was examined using optical microscopy and Scanning Electron Microscopy (SEM). Finally, Isothermal Conduction Calorimetry (ICC) measurements were carried out in order to determine the reactivity of the mechanically activated fly ash samples. As a result of the investigation, the relationship between the grinding process, the ground material properties and the geopolymer characteristics was established. It was found that the strength of the specimen strongly depends on the grinding conditions, i.e. type of mill, residence time.

Item Type:Article
Official URL/DOI:doi:10.1016/j.minpro.2015.08.010
Uncontrolled Keywords:Grinding; Mechanical activation; Fly ash; Geopolymer; Stirred media mill; Vibratory mill; Ball mill
Divisions:Metal Extraction and Forming
ID Code:7359
Deposited By:Sahu A K
Deposited On:26 Nov 2015 16:10
Last Modified:26 Nov 2015 16:10
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