Retracted: Effect of Reactive Magnesium Oxide on Properties of Alkali-Activated Slag-Cement Pastes
This article has been corrected.
VIEW CORRECTIONPublication: Journal of Materials in Civil Engineering
Volume 27, Issue 8
Abstract
The effect of different proportions and different reactivities of MgO on the drying shrinkage and compressive strength of alkali-activated slag pastes (AAS) has been investigated. The slag was activated by 6% by weight sodium hydroxide and liquid sodium silicate at a ratio of by weight. The MgO of different reactivities were produced from calcination of hydromagnesite at different temperatures (550, 1,000, and 1,250°C). The results showed that the reactivity of magnesium oxide decreases with the calcination temperature. Also, the drying shrinkage of AAS was reduced by the replacement of slag with different reactivities of MgO. The accelerated the hydration of AAS at early ages. The replacement of slag with 5% increased one-day compressive strength by , but had little effect. A significant increase in strength was observed after 7 days with the replacement of slag with 5% . The MgO reacts with slag to form hydrotalcite-like phases (Ht) as detected by X-ray diffraction, Fourier-transform infrared spectroscopy, and thermogravimetric and derivative thermogravimetric analysis.
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Journal of Materials in Civil Engineering
Volume 27 • Issue 8 • August 2015
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© 2014 American Society of Civil Engineers.
History
Received: May 27, 2014
Accepted: Sep 26, 2014
Published online: Oct 29, 2014
Discussion open until: Mar 29, 2015
Published in print: Aug 1, 2015
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