Chloride binding and mobility in sodium carbonate-activated slag pastes and mortars

X. Ke, S. A. Bernal, O. H. Hussein, J. L. Provis

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68 Citations (SciVal)

Abstract

This study evaluates the chloride binding capacity and the migration of chloride in sodium carbonate-activated slag cements and mortars. The effect on chloride mobility and binding of adding a calcined layered double hydroxide (CLDH) to the binder mix was also assessed. Significantly improved durability characteristics can be achieved for sodium carbonate-activated slag mortars by the addition of small fractions of CLDH, as a consequence of a higher degree of reaction, higher chloride binding capacity, and the refined pore structures present in these modified materials, in comparison with alkali-activated cements produced without CLDH. The addition of CLDH enables the production of sodium carbonate-activated slag cements with notably reduced chloride ingress compared to silicate activated slag cements.

Original languageEnglish
Article number252
JournalMaterials and Structures
Volume50
Early online date1 Dec 2017
DOIs
Publication statusPublished - 1 Dec 2017

Funding

Acknowledgements This research was funded by the European Research Council under the European Union’s Seventh Framework Programme (FP7/2007–2013)/ERC Grant Agreement #335928 (GeopolyConc). XK thanks the China Scholarship Council (CSC) for sponsoring her PhD studies. The participation of SAB in this research was partially funded by the UK Engineering and Physical Sciences Research Council through grant EP/M003272/1. This study was performed in part at the MIDAS Facility, at the University of Sheffield, which was established with support from the UK Department of Energy and Climate Change.

Keywords

  • Chloride
  • Durability
  • Layered double hydroxide
  • Microstructure
  • Sodium carbonate-activated slag

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Building and Construction
  • General Materials Science
  • Mechanics of Materials

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