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Effect of nano-metakaolin addition on the hydration characteristics of fly ash blended cement mortar

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Abstract

The effect of nano-metakaolin (NMK) addition on hydration characteristics of fly ash (FA) blended cement mortar was experimentally investigated. The amorphous or glassy silica, which is the major component of a pozzolan, reacts with the calcium hydroxide liberated during calcium silicate hydration. It is believable to add FA and NMK particles in order to make high performance concrete. The physico-mechanical properties of FA blended cement mortars made with different percentages of NMK were investigated. The experimental results showed that the compressive and flexural strengths of mortars containing NMK are higher than those of FA blended cement mortar at 60 days of hydration age. It is demonstrated that the nanoparticles enhances strength than FA. In addition, the hydration process was monitored using scanning electron microscopy and thermal gravimetric analysis (TG). The results of these examinations indicate that NMK behaves not only as a filler to improve microstructure, but also as an activator to promote the pozzolanic reaction.

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Acknowledgements

The Authors would like to extend their sincere appreciation to the Deanship of Scientific Research at King Saud University for its funding of this research through the research group project No. RGP-VPP-104.

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Correspondence to M. S. Morsy.

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Morsy, M.S., Al-Salloum, Y., Almusallam, T. et al. Effect of nano-metakaolin addition on the hydration characteristics of fly ash blended cement mortar. J Therm Anal Calorim 116, 845–852 (2014). https://doi.org/10.1007/s10973-013-3512-6

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Keywords

  • Nano-metakaolin
  • Fly ash
  • Compressive strength
  • Flexural strength
  • Thermal analyses
  • Microstructure