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Suitability of Remediated PFAS-Affected Soil in Cement Pastes and Mortars

Author

Listed:
  • Andras Fehervari

    (Institute for Frontier Materials, Deakin University, 221 Burwood Hwy, Burwood 3125, Australia)

  • Will P. Gates

    (Institute for Frontier Materials, Deakin University, 221 Burwood Hwy, Burwood 3125, Australia)

  • Chathuranga Gallage

    (Institute for Frontier Materials, Deakin University, 221 Burwood Hwy, Burwood 3125, Australia)

  • Frank Collins

    (Institute for Frontier Materials, Deakin University, 221 Burwood Hwy, Burwood 3125, Australia)

Abstract

Australia and many other parts of the world face issues of contamination in groundwater and soils by per- and poly-fluoroalkyl substances (PFAS). While the pyrolytic treatment of contaminated soils can destroy PFAS, the resulting heat-treated soils currently have limited applications. The purpose of this study was to demonstrate the usefulness of remediated soils in concrete applications. Using heat-treated soil as a fine aggregate, with a composition and particle size distribution similar to that of traditional concrete sands, proved to be a straightforward process. In such situations, complete fine aggregate replacement could be achieved with minimal loss of compressive strength. At high fine aggregate replacement (≥ 60%), a wetting agent was required for maintaining adequate workability. When using the heat-treated soil as a supplementary cementitious material, the initial mineralogy, the temperature of the heat-treatment and the post-treatment storage (i.e., keeping the soil dry) were found to be key factors. For cement mortars where minimal strength loss is desired, up to 15% of cement can be replaced, but up to 45% replacement can be achieved if moderate strengths are acceptable. This study successfully demonstrates that commercially heat-treated remediated soils can serve as supplementary cementitious materials or to replace fine aggregates in concrete applications.

Suggested Citation

  • Andras Fehervari & Will P. Gates & Chathuranga Gallage & Frank Collins, 2020. "Suitability of Remediated PFAS-Affected Soil in Cement Pastes and Mortars," Sustainability, MDPI, vol. 12(10), pages 1-19, May.
  • Handle: RePEc:gam:jsusta:v:12:y:2020:i:10:p:4300-:d:362466
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    References listed on IDEAS

    as
    1. Ali Naqi & Jeong Gook Jang, 2019. "Recent Progress in Green Cement Technology Utilizing Low-Carbon Emission Fuels and Raw Materials: A Review," Sustainability, MDPI, vol. 11(2), pages 1-18, January.
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