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Characterization Study of Zinc Sulphate’s Influence and Retarding Mechanism with Coarser and Finer Fly Ash Particles in Concrete

  • Structural Engineering
  • Published:
KSCE Journal of Civil Engineering Aims and scope

Abstract

Pozzolan, a modified cementitious material, has a major impact on the construction industry. Among the different composite materials, fly ash blended cement has great part due to its abundance. In recent years, the pulverized fly ash has become the key interest among the researchers because of its improved physical properties. This makes it necessary to study the effect of fly ash blends with various chemical admixtures. This study primarily focuses on bringing the changes happening in the strength, retarding mechanism, setting time, mineralogy, and microstructure caused by the addition of Zinc Sulphate (ZnSO4) in concrete having various percentages of raw fly ash (RFA) and ultrafine fly ash (UFFA). The result shows that ZnSO4 increases the setting time by more than 60%. Also, the study indicates decreased strength in concrete because of the reduced formation of hydrated products; this phenomenon is confirmed by scanning electron microscope (SEM), energy dispersive X-ray spectroscopy (EDS), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), and X-ray fluorescence (XRF) analysis.

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Acknowledgement

We sincerely acknowledge Nanotechnology Research Centre (NRC) and Physics and Nanotechnology Laboratory at SRM Institute of Science and Technology for their extensive help in microstructure analysis. We sincerely acknowledge Differential Scanning Calorimetry and other facilities in Thermal Division of Department of Mechanical Engineering, SRM IST. This research did not receive any specific grant from funding agencies in the public, commercial, or not-for-profit sectors.

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Correspondence to Loganathan Krishnaraj.

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Krishnaraj, L., Ramesh, N., Kumar, R.S. et al. Characterization Study of Zinc Sulphate’s Influence and Retarding Mechanism with Coarser and Finer Fly Ash Particles in Concrete. KSCE J Civ Eng 24, 2751–2766 (2020). https://doi.org/10.1007/s12205-020-2116-5

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  • DOI: https://doi.org/10.1007/s12205-020-2116-5

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