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High Volume Fly Ash (HVFA) concrete, in which more than 50% of Portland cement is replaced with fly ash, offers significant potential for reducing CO₂ emissions and promoting sustainable construction practices. When combined with Self-Compacting Concrete (SCC), HVFA provides additional benefits, including improved workability, uniformity, and the ability to fill formwork without mechanical vibration. In reinforced concrete (RC) structures, structural performance strongly depends on the efficiency of stress transfer between the concrete and steel reinforcement, which is governed by the mechanical interlock between reinforcement ribs and the surrounding concrete. A critical phenomenon in this context is the tension stiffening effect, the ability of RC members to sustain tensile stresses after cracking due to bond action between steel and concrete. This study investigates the tension stiffening behavior of HVFA-SCC RC beams with different tensile reinforcement ratios. Two simply supported beams measuring 150 × 250 × 2000 mm, with tensile reinforcement ratios of 0.61 and 1.09%, were tested under monotonic loading until failure. Beam deflection, tensile reinforcement strain, and crack propagation were continuously monitored during testing. The results indicate that the tensile reinforcement ratio is inversely proportional to maximum ductility but directly proportional to the ultimate moment capacity of HVFA-SCC RC beams. Furthermore, the post-peak tension stiffening effect diminishes more rapidly at higher reinforcement ratios. These findings provide new insights into the mechanical behavior of HVFA-SCC RC beams and contribute to the development of sustainable structural concrete design with optimized performance.

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Tension Stiffening of High Volume Fly Ash—Self Compacting Concrete Reinforced Concrete Beam with 0.61 and 1.09% Tensile Reinforcement Ratio

  • 会议论文

  • 发表日期：

    2026年

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  • Muhammad Fajrul Falah,
  • Stefanus Adi Kristiawan,
  • Halwan Alfisa Saifullah,
  • Rosyid Kholilur Rohman,
  • Yurisman Bachtiar

摘要

High Volume Fly Ash (HVFA) concrete, in which more than 50% of Portland cement is replaced with fly ash, offers significant potential for reducing CO₂ emissions and promoting sustainable construction practices. When combined with Self-Compacting Concrete (SCC), HVFA provides additional benefits, including improved workability, uniformity, and the ability to fill formwork without mechanical vibration. In reinforced concrete (RC) structures, structural performance strongly depends on the efficiency of stress transfer between the concrete and steel reinforcement, which is governed by the mechanical interlock between reinforcement ribs and the surrounding concrete. A critical phenomenon in this context is the tension stiffening effect, the ability of RC members to sustain tensile stresses after cracking due to bond action between steel and concrete. This study investigates the tension stiffening behavior of HVFA-SCC RC beams with different tensile reinforcement ratios. Two simply supported beams measuring 150 × 250 × 2000 mm, with tensile reinforcement ratios of 0.61 and 1.09%, were tested under monotonic loading until failure. Beam deflection, tensile reinforcement strain, and crack propagation were continuously monitored during testing. The results indicate that the tensile reinforcement ratio is inversely proportional to maximum ductility but directly proportional to the ultimate moment capacity of HVFA-SCC RC beams. Furthermore, the post-peak tension stiffening effect diminishes more rapidly at higher reinforcement ratios. These findings provide new insights into the mechanical behavior of HVFA-SCC RC beams and contribute to the development of sustainable structural concrete design with optimized performance.