Journal
CEMENT & CONCRETE COMPOSITES
Volume 86, Issue -, Pages 98-109Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.cemconcomp.2017.11.010
Keywords
Magnesium oxychloride cement (MOC); CO2 curing; Microstructure; Gel formation; Water resistance
Funding
- Construction Industry Council
- Hong Kong Polytechnic University (Project of Strategic Importance)
- Ian Richardson from the University of Leeds
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The water resistance of magnesium oxychioride cement (MOC) incorporating glass powder (GP) and pulverized fuel ash (PFA) with and without CO2 curing was investigated in terms of the strength retention coefficient and the volume stability. The microstructure was studied using quantitative X-ray diffraction (QXRD), thermogravimetry (TG), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The results show that the effect of incorporating GP on the water resistance is much lower than that of PFA due to the lower pozzolanic activity of GP generating a lower amount of magnesium silica hydrate gel (M-S-H gel). The MOC incorporated with GP or PFA showed high water resistance after CO2 curing due to the higher quantity of amorphous gel that formed a much denser interlocking network. (C) 2017 Elsevier Ltd. All rights reserved.
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