How does aluminium foaming agent impact the geopolymer formation mechanism?
Ailar Hajimohammadi, Tuan Ngo, Priyan Mendis
CEMENT & CONCRETE COMPOSITES | ELSEVIER SCI LTD | Published : 2017
Aluminium is widely used as a foaming agent in lightweight geopolymer concretes. The impact of aluminium reaction on the phase evolution of fly-ash based geopolymers is investigated. In-situ Fourier transform infrared spectroscopy (FTIR) is used to track the changes in the nanostructure of geopolymers. By combining the FTIR functional group analysis with Atomic-force microscopy (AFM) results, it is possible to evaluate the phase development during the early hours of reaction. At the initial stages of geopolymerization, aluminium reaction induces the formation of aluminium hydroxide gel which precipitates on fly ash and conceals the reactive surface of ash particles. Therefore, the dissolutio..View full abstract
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Awarded by ARC Linkage Grant
The authors would like to acknowledge the financial support from the ARC Linkage Grant LP140100504.This work is performed in part at the Materials Characterisation and Fabrication Platform (MCFP) at the University of Melbourne and the Victorian Node of the Australian National Fabrication Facility (ANFF).