Hydration of alkali-activated ground granulated blast furnace slag

S. Song, D. Sohn, H. M. Jennings, Thomas O Mason

Research output: Contribution to journalArticle

168 Citations (Scopus)

Abstract

The hydration of ground granulated blast furnace slag (GGBFS) at 25 °C in controlled pH environments was investigated during 28 days of hydration. GGBFS was activated by NaOH, and it was found that the rate of reaction depends on the pH of the starting solution. The main product was identified as C-S-H, and, in the pastes with high pH, hydrotalcite was observed at later stages of hydration. The pH of the mixing solution should be higher than pH 11.5 to effectively activate the hydration of GGBFS. As deduced from very low electrical conductivity measurements, GGBFS pastes had very tortuous and disconnected pores. The effect of the pH of the aqueous solution on the composition, microstructure and properties of alkali-activated GGBFS pastes are also discussed.

Original languageEnglish
Pages (from-to)249-257
Number of pages9
JournalJournal of Materials Science
Volume35
Issue number1
DOIs
Publication statusPublished - 2000

ASJC Scopus subject areas

  • Materials Science(all)

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