Journal article
Role of carbonates in the chemical evolution of sodium carbonate-activated slag binders
SA Bernal, JL Provis, RJ Myers, R San Nicolas, JSJ van Deventer
Materials and Structures Materiaux Et Constructions | Published : 2014
Abstract
Multi-technique characterisation of sodium carbonate-activated blast furnace slag binders was conducted in order to determine the influence of the carbonate groups on the structural and chemical evolution of these materials. At early age (<4 days) there is a preferential reaction of Ca2+ with the CO3 2− from the activator, forming calcium carbonates and gaylussite, while the aluminosilicate component of the slag reacts separately with the sodium from the activator to form zeolite NaA. These phases do not give the high degree of cohesion necessary for development of high early mechanical strength, and the reaction is relatively gradual due to the slow dissolution of the slag under the moderat..
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Awarded by Australian Research Council
Funding Acknowledgements
This work has been funded by the Australian Research Council, through a Linkage Project cosponsored by Zeobond Pty Ltd, including partial funding through the Particulate Fluids Processing Centre. We wish to thank Adam Kilcullen and David Brice for preparation of pastes specimens, John Gehman for his assistance in NMR data collection and Volker Rose and Xianghui Xiao for assistance in the data collection and processing on the 2BM instrument. Use of the Advanced Photon Source was supported by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, under Contract DE-AC02-06CH11357. The work of JLP and SAB received funding from the European Research Council under the European Union's Seventh Framework Programme (FP/2007-2013)/ERC Grant Agreement #335928 (GeopolyConc), and from the University of Sheffield.