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

Xinyuan Ke, Susan A. Bernal, Oday H. Hussein, John L. Provis

Research output: Contribution to journalArticle

19 Citations (Scopus)

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

Keywords

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

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Building and Construction
  • Materials Science(all)
  • Mechanics of Materials

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