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

By Yazan Alrefaei, Yan-Shuai Wang, Jian-Guo Dai. Cement & Concrete Composites, 2019

172 citations recorded by the source corpus.

Abstract This paper investigates the effect of using different admixtures on the one-part ambient-cured alkali activated pastes. Na2SiO3-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 Na2SiO3-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 Na2SiO3-anhydrous one-part AAMs. However, lowering the water/precursor ratio in the Na2SiO3-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 Na2SiO3 alkali medium of one-part AAMs (for w/b = 0.4).

Subfields: Building and Construction, Civil and Structural Engineering, Materials Chemistry

View Paper: https://www.semanticscholar.org/paper/f12afd8ce4d34b2dcaad7f955722e53e2a178b4a

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In Building and Construction

1. Pascaline Patureau
2. A. Marsh
3. Y. Pontikes
4. Andrew Heath
5. S. A. Bernal
6. J. Provis

In Civil and Structural Engineering

1. Pascaline Patureau
2. A. Marsh
3. Ö. Cizer
4. Ahmed Khalifa
5. Y. Pontikes
6. Andrew Heath
7. S. A. Bernal
8. J. Provis

In Materials Chemistry

1. Pascaline Patureau
2. A. Marsh
3. Ö. Cizer
4. Ahmed Khalifa
5. Y. Pontikes
6. Andrew Heath
7. S. A. Bernal
8. J. Provis

Citations in the corpus

• Advances in alkali-activation of clay minerals (2020, background): “These difficulties may be partly remedied by ongoing efforts to develop appropriate plasticity-modifying admixtures for AAMs [45], as those developed for Portland cement-based systems are often incompatible [22].”