Pore solution composition of alkali-activated slag/fly ash pastes

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The pore solutions of a series of hardened alkali-activated slag/fly ash pastes were extracted by the steel-die method, and analyzed using ICP-OES analysis technique. According to the saturation index from thermodynamic calculations, the pore solutions of alkali-activated slag pastes kept oversaturated with respect to solid reaction products with time. In the pore solutions of alkali-activated fly ash pastes, an increase of temperature (from 40 °C to 60 °C) led to decreases of the concentrations of Si, Al, Ca, Na, OH−, K, Fe and Mg, while the soluble silicate in the alkaline activator resulted in increases of the concentrations of these elements. Compared to the alkali-activated slag paste with the same alkaline activator, 50% replacement of slag by fly ash did not result in a substantial change of the pore solution composition. Based on the experimental results, conceptual models were proposed to describe the elemental concentrations in the pore solutions.
Original languageEnglish
Pages (from-to)230-250
Number of pages21
JournalCement and Concrete Research
Publication statusPublished - 1 Jan 2019

Bibliographical note

Accepted Author Manuscript


  • Alkali activation
  • Slag/fly ash
  • Pore solution
  • Saturation index
  • Conceptual models


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