Microstructural Investigation of Compressive Strength and Permeability of Concrete Containing Fly Ash in the Marine Environment of the Persian Gulf

Document Type : Research Papers

Authors

1 Associate Professor, University of Hormozgan, Faculty of Engineering, Bandar Abbas, Iran.

2 M.Sc., Islamic Azad University of Bandar Abbas, Faculty of Engineering, Bandar Abbas, Iran.

3 M.Sc., University of Hormozgan, Faculty of Engineering, Bandar Abbas, Iran.

Abstract

Investigating the impact of fly ash on concrete strength and durability in the challenging marine environment of the Persian Gulf is crucial due to sulfate attacks and salt effects. This study aims to enhance the lifespan of these structures by increasing strength and reducing permeability. The innovative approach involves microstructural assessment of fly ash’s influence on Calcium Hydroxide (CH) and C-S-H nanostructure formation in concrete. Around 120 concrete samples with varying fly ash content were exposed to the Persian Gulf for three months, undergoing compressive strength, permeability, and microstructural analysis. Results reveal fly ash addition decreases permeability and boosts concrete strength. Notably, concrete containing 10% fly ash exhibited a 15.4% strength increase and reduced permeability from 22.4 × 10-7 cm/h to 8.98 × 10-7 cm/h after 90 days. Scanning Electron Microscopy (SEM) and Energy Dispersive X-ray (EDX) analysis showcased CH reduction and enhanced C-S-H nanostructure, bolstering concrete durability. This study offers valuable insights for engineers constructing coastal Persian Gulf structures, indicating fly ash augmentation enhances microstructural properties, reduces permeability, and bolsters strength.

Keywords

References

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Civil Engineering Infrastructures Journal
Volume 57, Issue 2
December 2024
Pages 323-336

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History

  • Receive Date: 30 June 2023
  • Revise Date: 08 November 2023
  • Accept Date: 13 November 2023

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