Journal article
Examination of alkali-activated material nanostructure during thermal treatment
B Walkley, A Kashani, MA Sani, TD Ngo, P Mendis
Journal of Materials Science | SPRINGER | Published : 2018
Abstract
The key nanostructural changes occurring in a series of alkali-activated materials (AAM) based on blends of slag and fly ash precursors during exposure to temperatures up to 1000 °C are investigated. The main reaction product in each AAM is a crosslinked sodium- and aluminium-substituted calcium silicate hydrate (C-(N)-A-S-H)-type gel. Increased alkali content promotes the formation of an additional sodium aluminosilicate hydrate (N-A-S-(H)) gel reaction product due to the structural limitations on Al substitution within the C-(N)-A-S-H gel. Heating each AAM to 1000 °C results in the crystallisation of the disordered gels and formation of sodalite, nepheline and wollastonite. Increased forma..
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Awarded by Australian Research Council
Funding Acknowledgements
This project was funded by the Australian Research Council (ARC), including support through an ARC Linkage Project (Grant number: LP140100504) and through the ARC Centre for Advanced Manufacturing of Prefabricated Housing. XRD data were acquired at the Materials Characterisation and Fabrication Platform (MCFP), The University of Melbourne, and the Victorian Node of the Australian National Fabrication Facility (ANFF). The authors thank Professor John L. Provis, The University of Sheffield, for very insightful discussions regarding this work.