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Alkali activated slag binder: effect of cations from silicate activators

Abstract

Two blast furnace slags were activated by alkali hydroxide and alkali silicate solutions possessing different modulus (0.5, 1 and 2), as well as cations (sodium and potassium). Their properties, including the setting time, heat of hydration, compressive strength as well as porosity and morphology have been investigated on both fresh and hardened pastes. The results showed that the cations of these silicate activators exerted a significant effect on the performance of the alkali activated slag binder, whereby the mechanical strength of the binder was promoted greater by the potassium silicate solution as compared to by the sodium silicate solution.

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Acknowledgments

The authors thank Dr. Ehrenberg (FEhS) and Dr. Krakehl (Woellner GmbH) for the supply of slag and alkali silicate solutions. Furthermore, the work of the laboratory staff of the University of Kassel is greatly acknowledged.

Funding

This study was funded by Arbeitsgemeinschaft industrieller Forschungsvereinigungen (AiF, Grant Number: 15800 BG) and Federal Ministry of Education and Research of Germany (BMBF, Grant Number: 03X0067G).

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Correspondence to Dietmar Stephan.

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Tänzer, R., Jin, Y. & Stephan, D. Alkali activated slag binder: effect of cations from silicate activators. Mater Struct 50, 91 (2017). https://doi.org/10.1617/s11527-016-0961-y

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  • DOI: https://doi.org/10.1617/s11527-016-0961-y

Keywords

  • Blast furnace slag
  • Alkali activation
  • Sodium/potassium silicate
  • Water glass