Alkaline Activation of Aluminum and Iron Rich Precursors

Abstract:

The alkaline activation of aluminosilicates materials has been motivated by their enhanced thermomechanical properties. Despite the majority of studies comprise the evaluation industrial byproduct of precursors (fly ash and slag), metakaolin (Al₂O₃.2SiO₂) is acknowledged to have structure and chemical composition characteristics that make it very reactive as far as alkaline activation is concerned. In tropical regions of the earth, as is the case in northeastern Brazil, there are some waste (kaolin waste, red brick waste and weathered tropical soils) whose alkaline activation potential have not yet been fully studied. These sources are known to have other metals such as iron in its structure, which might affect the alkaline activation. This paper aims to evaluate the potential of alkaline activation of these wastes. Chemical and structural characterization were performed by means of x-ray fluorescence, x-ray diffraction, infrared spectroscopy and compressive strength. The results indicate that all studied waste presented significant potential as precursor material for alkaline activation.

• Periodical: Key Engineering Materials (Volume 600)
• Pages: 329-337
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.600.329
• Online since: March 2014
• Authors: Kelly Cristiane Gomes*, Sandro Marden Torres, Zaqueu Ernesto da Silva, Normando Perazzo Barbosa, Marçal Rosas Florentino Lima Filho
• Keywords: Alcaline Activation, Geopolymer, Industrial Waste, Multiple Minerals

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