Influence of different curing regimes on the performance and microstructure of alkali-activated slag concrete

Hilal El-Hassan, Ehab Shehab, Abdelrahman Al-Sallamin

Research output: Contribution to journalArticlepeer-review

23 Citations (Scopus)

Abstract

This paper investigates the performance and microstructure of alkali-activated slag concrete (AASC) subjected to different 28-day curing regimes: air, intermittent water curing (7 days in water followed by 21 days in air), and continuous water curing. Three concrete mixes were prepared with fixed contents of slag, desert dune sand, and aggregate and activated by an alkaline solution consisting of sodium silicate and sodium hydroxide. The ratio of alkaline activator solution (AAS) to slag was varied between 0.45 and 0.55. Samples were tested to assess transport and mechanical properties. Test results showed that an AAS:slag ratio of 0.50 provided optimal performance. Intermittent water curing was found to be the most effective curing regime, resulting in a reduction in porosity and sorptivity, and an increase in bulk electrical resistivity, modulus of elasticity, and compressive strength. Differential scanning calorimetry, Fourier transform infrared spectroscopy, and scanning electron microscopy were used to characterize the microstructure. Calcium alumino-silicate hydrate gel was highlighted as the main reaction product, while sodium alumino-silicate hydrate gel was only detected in air cured counterparts.

Original languageEnglish
Article number04018230
JournalJournal of Materials in Civil Engineering
Volume30
Issue number9
DOIs
Publication statusPublished - Sep 1 2018

Keywords

  • Alkali-activated slag concrete
  • Curing
  • Mechanical properties
  • Microstructure
  • Transport properties

ASJC Scopus subject areas

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

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