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 language | English |
|---|---|
| Pages (from-to) | 166-174 |
| Number of pages | 9 |
| Journal | Cement and Concrete Composites |
| Volume | 97 |
| DOIs | |
| Publication status | Published - Mar 2019 |
Keywords
- Admixtures
- Alkali-activated materials
- Fly ash
- Mechanical properties
- Slag
- Workability
ASJC Scopus subject areas
- Building and Construction
- General Materials Science