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Appl. Sci. 2018, 8(12), 2515; https://doi.org/10.3390/app8122515

Gypsum-Dependent Effect of NaCl on Strength Enhancement of CaO-Activated Slag Binders

1
School of Urban and Environmental Engineering, Ulsan National Institute of Science and Technology (UNIST), UNIST-gil 50, Ulju-gun, Ulsan 44919, Korea
2
Department of Architecture and Architectural Engineering, Seoul National University, 1, Gwanak-ro, Gwanak-Gu, Seoul 08826, Korea
*
Author to whom correspondence should be addressed.
Received: 16 October 2018 / Revised: 28 November 2018 / Accepted: 28 November 2018 / Published: 6 December 2018
(This article belongs to the Section Materials)
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Abstract

This study explores the combined effect of NaCl and gypsum on the strength of the CaO-activated ground-granulated blast furnace slag (GGBFS) binder system. In the CaO-activated GGBFS system, the incorporation of NaCl without gypsum did not improve the strength of the system. However, with the presence of gypsum, the use of NaCl yielded significantly greater strength than the use of either gypsum or NaCl alone. The presence of NaCl largely increases the solubility of gypsum in a solution, leading to a higher concentration of sulfate ions, which is essential for generating more and faster formations of ettringite in a fresh mixture of paste. The significant strength enhancement of gypsum was likely due to the accelerated and increased formation of ettringite, accompanied by more efficient filling of pores in the system. View Full-Text
Keywords: CaO-activation; slag; gypsum; NaCl; cementless binder; construction binder CaO-activation; slag; gypsum; NaCl; cementless binder; construction binder
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Sim, S.; Lee, H.; Jeon, D.; Song, H.; Yum, W.S.; Kim, D.; Suh, J.-I.; Oh, J.E. Gypsum-Dependent Effect of NaCl on Strength Enhancement of CaO-Activated Slag Binders. Appl. Sci. 2018, 8, 2515.

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