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Performance of Alkali-Activated Self-Compacting Concrete with Incorporation of Nanosilica and Metakaolin

Author

Listed:
  • Alaa Mohammedameen

    (Department of Highways and Bridges, Duhok Polytechnic University, Duhok 42002, Iraq
    Department of Civil Engineering, Nawroz University, Duhok P.O. Box 77, Iraq)

Abstract

This study aims to analyze the influence of nano-silica (NS) and metakaolin (MK) as binder replacement materials on the fresh and hardened performance of alkali-activated self-compacting concretes (A-ASCC). Therefore, nine A-ASCC mixes with and without metakaolin were prepared, as well as mixes with and without NS inclusion. Slump flow, v-funnel, L-box, and T50 value tests were used to investigate the fresh properties of A-ASCC. While the hardened performance was examined using compressive strength, bonding strength (pullout test), fracture toughness and flexural tensile strength tests. A relationship analysis was also conducted on the A-ASCC experimental data. The experimental results showed that the addition of NS and MK had a negative influence on the fresh characteristics of fly ash-based A-ASCC mixtures, while the addition of metakaolin had a higher effect. The addition of 1% and 2% NS, on the other hand, significantly enhanced the mechanical performance of the A-ASCC specimens. The use of more than 2% of NS had a negative influence on the mechanical properties of A-ASCC. The mechanical properties of A-ASCC were improved significantly by metakaolin replacement ratios. The A-ASCC bond strength showed the highest improvement. Furthermore, using NS and/or MK significantly increased the A-ASCC setting time and may be used to produce A-ASCC at ambient environment.

Suggested Citation

  • Alaa Mohammedameen, 2022. "Performance of Alkali-Activated Self-Compacting Concrete with Incorporation of Nanosilica and Metakaolin," Sustainability, MDPI, vol. 14(11), pages 1-29, May.
    • Handle: RePEc:gam:jsusta:v:14:y:2022:i:11:p:6572-:d:825923
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