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The Durability of High-Volume Fly Ash-Based Cement Composites with Synthetic Fibers in a Corrosive Environment: A Long-Term Study

Author

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  • H. K. Sugandhini

    (Department of Civil Engineering, Manipal Institute of Technology, Manipal Academy of Higher Education, Manipal 576104, Karnataka, India)

  • Gopinatha Nayak

    (Department of Civil Engineering, Manipal Institute of Technology, Manipal Academy of Higher Education, Manipal 576104, Karnataka, India)

  • Kiran K. Shetty

    (Department of Civil Engineering, Manipal Institute of Technology, Manipal Academy of Higher Education, Manipal 576104, Karnataka, India)

  • Laxman P. Kudva

    (Department of Civil Engineering, Manipal Institute of Technology, Manipal Academy of Higher Education, Manipal 576104, Karnataka, India)

Abstract

The utilization of class F fly ash (F-FA) is limited to 15–30% as a substitution for cement. The study intends to tap into the potential of high-volume F-FA as a pozzolan and micro filler by eliminating aggregates. The article presents the long-term behavior of a novel cement composite called no-aggregate concrete (NAC), incorporating 20% ordinary Portland cement (OPC) and 80% F-FA, with polypropylene (PP) fibers in 0.6, 0.8, and 1.0% volume fractions, in a corrosive environment. The bulk diffusion of preconditioned 100 mm cubes reveals that all mixtures’ chloride-binding capacity increases significantly with prolonged exposure. The total chloride content for mixtures M1, M2, and M3 is within acceptable limits as per EN 206. M4 with 1.0% PP fibers shows a higher total chloride content at 2 cm depth. The average chloride content for all mixtures is within 0.4%. The compressive strength of mixtures cured in water is about 90 MPa at 730 days, and is severely affected in the absence of fibers in a corrosive environment. The microstructure of mixtures at 730 days displays a cohesive, compact, continuous matrix, and the presence of unreacted F-FA.

Suggested Citation

  • H. K. Sugandhini & Gopinatha Nayak & Kiran K. Shetty & Laxman P. Kudva, 2023. "The Durability of High-Volume Fly Ash-Based Cement Composites with Synthetic Fibers in a Corrosive Environment: A Long-Term Study," Sustainability, MDPI, vol. 15(15), pages 1-18, July.
    • Handle: RePEc:gam:jsusta:v:15:y:2023:i:15:p:11481-:d:1201608
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    References listed on IDEAS

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    1. Kazim Turk & Ceren Kina & Moncef L. Nehdi, 2022. "Durability of Engineered Cementitious Composites Incorporating High-Volume Fly Ash and Limestone Powder," Sustainability, MDPI, vol. 14(16), pages 1-15, August.
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