Journal
CEMENT AND CONCRETE RESEARCH
Volume 74, Issue -, Pages 78-87Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.cemconres.2015.01.015
Keywords
Microstructure; SEM; Fly ash; Granulated blast furnace slag; Chemically Bonded Ceramics
Funding
- Royal Academy of Engineering [R/124464-11-1]
- Nuclear Decommissioning Authority [R/124464-11-1]
- EPSRC [EP/G037140/1]
- University of Sheffield
- BBSRC
- University of Warwick viaBirmingham Science City Advanced Materials Projects 1 and 2
- Advantage West Midlands (AWM)
- European Regional Development Fund (ERDF)
- EPSRC [EP/F017901/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/F017901/1, 974539] Funding Source: researchfish
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Magnesium potassium phosphate cements (MKPCs), blended with 50 wt.% fly ash (FA) or ground granulated blast furnace slag (GBFS) to reduce heat evolution, water demand and cost, were assessed using compressive strength, X-ray diffraction (XRD), scanning electron microscopy (SEM) and nuclear magnetic resonance (NMR) spectroscopy on Mg-25, Al-27, Si-29, P-31 and K-39 nuclei. We present the first definitive evidence that dissolution of the glassy aluminosilicate phases of both FA and GBFS occurred under the pH conditions of MKPC. In addition to the main binder phase, struvite-K, an amorphous orthophosphate phase was detected in FA/MKPC and GBFS/MKPC systems. It was postulated that an aluminium phosphate phase was formed, however, no significant Al-O-P interactions were identified. High-field NMR analysis of the GBES/MKPC system indicated the potential formation of a potassium-aluminosilicate phase. This study demonstrates the need for further research on these binders, as both FA and GBFS are generally regarded as inert fillers within MKPC (C) 2015 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).
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