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<p>Disposal of waste air-cooled ferrochromium slag (AFS) with appreciable hazardous chromium content (10.32% as Cr<sub>2</sub>O<sub>3</sub>) may not be acceptable from environmental consideration. This paper analyses the technical suitability and environmental compatibility of AFS as concrete aggregate material with different blended cement. The waste AFS having available size range of 8–18&#xa0;mm and having better aggregate properties may be gainfully utilised as coarse aggregate replacing natural stone in concrete work. Mobilisation of chromium from AFS concrete with different blended cements have found to be in the range of 0.027 to 0.088&#xa0;mg/L for hexavalent chromium and 0.12 to 0.48&#xa0;mg/L with respect to total chromium complying with the statutory regulatory norm. In depth microstructure study and subsequent chromium fixing and mobilization of in situ AFS and concrete bound AFS investigation reveal that almost all chromium is inherently bound to this waste in spinel and mixed spinel phase allowing the elution of very insignificant amount of chromium. AFS as aggregate along with blast furnace slag based blended cement results in minimum strength and mass loss in concrete in the tune of 1.17% and 0.2% under adverse acid rain curing condition. Thus, AFS provides excellent results with respect to strength characteristics and simultaneously satisfies the environmental issues with almost no carbon emission so as to qualify itself as green aggregate in concrete manufacturing.</p>

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Leaching and microstructure assessment of ferrochromium slag as green aggregate in concrete manufacturing

  • 期刊论文

  • 发表日期：

    2025年3月19日

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  • Anubha Pujary,
  • Tara Prasad Rath,
  • Trilochan Jena,
  • Nibedita Pradhan,
  • Chittaranjan Panda

摘要

Disposal of waste air-cooled ferrochromium slag (AFS) with appreciable hazardous chromium content (10.32% as Cr2O3) may not be acceptable from environmental consideration. This paper analyses the technical suitability and environmental compatibility of AFS as concrete aggregate material with different blended cement. The waste AFS having available size range of 8–18 mm and having better aggregate properties may be gainfully utilised as coarse aggregate replacing natural stone in concrete work. Mobilisation of chromium from AFS concrete with different blended cements have found to be in the range of 0.027 to 0.088 mg/L for hexavalent chromium and 0.12 to 0.48 mg/L with respect to total chromium complying with the statutory regulatory norm. In depth microstructure study and subsequent chromium fixing and mobilization of in situ AFS and concrete bound AFS investigation reveal that almost all chromium is inherently bound to this waste in spinel and mixed spinel phase allowing the elution of very insignificant amount of chromium. AFS as aggregate along with blast furnace slag based blended cement results in minimum strength and mass loss in concrete in the tune of 1.17% and 0.2% under adverse acid rain curing condition. Thus, AFS provides excellent results with respect to strength characteristics and simultaneously satisfies the environmental issues with almost no carbon emission so as to qualify itself as green aggregate in concrete manufacturing.