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A common approach to recycling/reusing air-cooled blast furnace (ACBFS), a byproduct of the iron-making industry, is by producing fine and coarse aggregates for use by the construction industry as a partial or complete replacement of natural aggregates. As aggregates occupy the largest volume of produced concrete, the use of recycled ACBFS as coarse aggregates serves two sustainability goals, namely, recycling/reusing of materials to save landfill as well as saving natural resources. The effect of partial or complete replacement of natural aggregates with ACBFS on the flexural and splitting tensile strength of concrete was evaluated in this study. The control concrete mix (mix 1) was prepared using 100% natural coarse aggregates. Two mixes (mix 2 and 3) were prepared with 30 and 50% replacements of natural aggregates with ACBFS aggregates. Mix 4 was prepared with 100% ACBFS aggregates. It was found that replacing natural coarse aggregates with ACBFS consistently increases both flexural and tensile strengths by up to a replacement percentage of 50%. The use of 100% ACBFS decreases the tensile strength slightly compared to the 50% replacement percentage. However, 28-day flexural strength of concrete with 30–100% ACBFS aggregates is higher than the flexural strength of the control mix made with natural aggregates, even when the w/c ratio of concrete with ACBFS aggregates was higher than or equal to the w/c of concrete with natural aggregates. This indicates the possible activation of ACBFS after 28 days of curing and the production of C-S–H gel that contributed to strength. However, the 7-day flexural strength of 100% ACBFS aggregates was lower than the control mix. This is possibly due to the higher w/c (0.45) compared to concrete with natural aggregates (0.4), and the insufficient time to produce reaction products through the activation and dissolution of slag in ACBFS aggregates. At the same w/c ratio (0.45), 50% replacement represented the optimum percentage, but the difference between the flexural strength of control concrete with natural aggregate and concrete with ACBFS aggregates was relatively small (<5%).

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Flexural and Splitting Tensile Strengths of Sustainable Concrete with Natural and Recycled Air-Cooled Blast Furnace Slag Aggregates

  • 会议论文

  • 发表日期：

    2025年

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  • Osama A. Mohamed,
  • Osama N. Ghanam,
  • Ahmed R. A. Hamdan,
  • Haya A. Zuaiter

摘要

A common approach to recycling/reusing air-cooled blast furnace (ACBFS), a byproduct of the iron-making industry, is by producing fine and coarse aggregates for use by the construction industry as a partial or complete replacement of natural aggregates. As aggregates occupy the largest volume of produced concrete, the use of recycled ACBFS as coarse aggregates serves two sustainability goals, namely, recycling/reusing of materials to save landfill as well as saving natural resources. The effect of partial or complete replacement of natural aggregates with ACBFS on the flexural and splitting tensile strength of concrete was evaluated in this study. The control concrete mix (mix 1) was prepared using 100% natural coarse aggregates. Two mixes (mix 2 and 3) were prepared with 30 and 50% replacements of natural aggregates with ACBFS aggregates. Mix 4 was prepared with 100% ACBFS aggregates. It was found that replacing natural coarse aggregates with ACBFS consistently increases both flexural and tensile strengths by up to a replacement percentage of 50%. The use of 100% ACBFS decreases the tensile strength slightly compared to the 50% replacement percentage. However, 28-day flexural strength of concrete with 30–100% ACBFS aggregates is higher than the flexural strength of the control mix made with natural aggregates, even when the w/c ratio of concrete with ACBFS aggregates was higher than or equal to the w/c of concrete with natural aggregates. This indicates the possible activation of ACBFS after 28 days of curing and the production of C-S–H gel that contributed to strength. However, the 7-day flexural strength of 100% ACBFS aggregates was lower than the control mix. This is possibly due to the higher w/c (0.45) compared to concrete with natural aggregates (0.4), and the insufficient time to produce reaction products through the activation and dissolution of slag in ACBFS aggregates. At the same w/c ratio (0.45), 50% replacement represented the optimum percentage, but the difference between the flexural strength of control concrete with natural aggregate and concrete with ACBFS aggregates was relatively small (<5%).