The effectiveness of different superplasticizers in ambient cured one-part alkali activated pastes

Yazan Alrefaei, Yan Shuai Wang, Jian Guo Dai

Research output: Journal article publicationJournal articleAcademic researchpeer-review

22 Citations (Scopus)

Abstract

This paper investigates the effect of using different admixtures on the one-part ambient-cured alkali activated pastes. Na 2 SiO 3 -Anhydrous powder was used as solid activator along with three superplasticizers including naphthalene, melamine and polycarboxylate with different water/precursor ratios. The flowability, setting time and compressive strength development were evaluated for all AAMs mixes. ATR-FTIR test was used to check the admixtures stability in high alkali media. All types of admixtures significantly improved the flowability of the Na 2 SiO 3 -anhydrous one-part AAMs and marginally affected the compressive strength. The results showed that polycarboxylate was effective for high water/precursor (≥0.36) while naphthalene performed better in case of low water/precursor (≤0.36) for Na 2 SiO 3 -anhydrous one-part AAMs. However, lowering the water/precursor ratio in the Na 2 SiO 3 -anhydrous one-part AAMs using superplasticizers showed no improvement or modest improvement in the compressive strength. The ATR-FTIR results revealed the relatively high stability of admixtures in Na 2 SiO 3 alkali medium of one-part AAMs (for w/b = 0.4).

Original languageEnglish
Pages (from-to)166-174
Number of pages9
JournalCement and Concrete Composites
Volume97
DOIs
Publication statusPublished - Mar 2019

Keywords

  • Admixtures
  • Alkali-activated materials
  • Fly ash
  • Mechanical properties
  • Slag
  • Workability

ASJC Scopus subject areas

  • Building and Construction
  • Materials Science(all)

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