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<p>The present research deals with improving the performance, scalability and environmental assessment of recycled aggregate in concrete. The study incorporates the use of alternative sustainable materials such as fly ash (FA), waste tyre steel fibres, and demolished aggregates. The research focuses on the applicability of high-volume fly ash (HVFA) together with the recycled aggregate concrete with the help of sulphate activation. Mix proportions were designed to identify the impact of sulphate activation of HVFA together with the addition of demolished aggregates (DA) on the strength, durability, microstructure and environment. The fresh concrete properties exhibited a diminishing trend due to the increasing percentage of demolished aggregate and FA, and also for fibre-reinforced concrete mixes. Sulphate activation and waste steel fibers improved the compressive strength of HVFA concrete upto 19.2% and 46%. The 28-day flexural strength improvement for waste fiber reinforced HVFA concrete was 24.6% compared to HVFA concrete. The sulphate activation improved the microstructure of the HVFA concrete, which was reflected in the durability studies. The water and chloride penetration in sulphate-activated HVFA reduced to about 12% and 23.4%. SEM micrographs provide evidence for the reaction of dormant fly ash particles in forming hydration products. Global warming potential (GWP) was used as a sustainability tool for the life cycle assessment, exhibiting a 35–45% reduction in GWP for mix containing demolished aggregate, HVFA, and waste steel fibers when compared to the control mix. Results show that incorporating these alternative sustainable materials produces concrete with strength properties comparable to traditional concrete. Additionally, this approach promotes sustainability by conserving natural resources, encouraging recycling, and lowering the carbon footprint of concrete production.</p>

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Study on the Mechanical, Microstructural, and Environmental Assessment of Concrete Containing High Volume Fly Ash and Waste Tyre Steel Fibers

  • 期刊论文

  • 发表日期：

    2026年6月18日

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  • Sankar B,
  • Rameshkumar D,
  • Gautham Kishore Reddy,
  • Arunkumar K,
  • Vishnuprasad V Prabhakar,
  • Anamika S M

摘要

The present research deals with improving the performance, scalability and environmental assessment of recycled aggregate in concrete. The study incorporates the use of alternative sustainable materials such as fly ash (FA), waste tyre steel fibres, and demolished aggregates. The research focuses on the applicability of high-volume fly ash (HVFA) together with the recycled aggregate concrete with the help of sulphate activation. Mix proportions were designed to identify the impact of sulphate activation of HVFA together with the addition of demolished aggregates (DA) on the strength, durability, microstructure and environment. The fresh concrete properties exhibited a diminishing trend due to the increasing percentage of demolished aggregate and FA, and also for fibre-reinforced concrete mixes. Sulphate activation and waste steel fibers improved the compressive strength of HVFA concrete upto 19.2% and 46%. The 28-day flexural strength improvement for waste fiber reinforced HVFA concrete was 24.6% compared to HVFA concrete. The sulphate activation improved the microstructure of the HVFA concrete, which was reflected in the durability studies. The water and chloride penetration in sulphate-activated HVFA reduced to about 12% and 23.4%. SEM micrographs provide evidence for the reaction of dormant fly ash particles in forming hydration products. Global warming potential (GWP) was used as a sustainability tool for the life cycle assessment, exhibiting a 35–45% reduction in GWP for mix containing demolished aggregate, HVFA, and waste steel fibers when compared to the control mix. Results show that incorporating these alternative sustainable materials produces concrete with strength properties comparable to traditional concrete. Additionally, this approach promotes sustainability by conserving natural resources, encouraging recycling, and lowering the carbon footprint of concrete production.