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<p>This study investigates the mechanical performance, bond behavior, and environmental efficiency of self-compacting concrete (SCC) incorporating recycled waste tire rubber for use as a sustainable repair material. Rubber powder was used to replace limestone powder, and rubber granules were used to replace fine aggregates at 10%, 20%, and 30% by volume. The effects of these substitutions were evaluated through fresh-state testing, mechanical strength assessment, interfacial bond characterization, microstructural analysis, and life cycle assessment (LCA). The slump flow diameter decreased from 52&#xa0;cm (control) to 49–47&#xa0;cm with increasing rubber content, while L-box values ranged from 1.00 (control) to 0.71. At 28&#xa0;days, compressive strength declined from 37.7 to 32.4–21.5&#xa0;MPa, and splitting tensile strength decreased from 1.14 to 1.05–0.49&#xa0;MPa depending on rubber type and percentage. Despite these reductions, a notable enhancement in bi-surface shear bond strength was achieved in mixtures containing rubber powder, with the 30% replacement mix (CRLW3) reaching 3.20&#xa0;MPa compared to 1.55&#xa0;MPa for the control. SEM and ultrasonic pulse velocity (UPV) analyses revealed increased porosity, weaker rubber–paste interfaces, and UPV reductions of 1–12%, correlating with observed decreases in strength. LCA results demonstrated a substantial reduction of up to 45% in CO<sub>2</sub> emissions relative to conventional SCC, highlighting the environmental benefits of incorporating recycled rubber. The findings indicate that rubberized SCC, particularly mixes containing fine rubber powder, offers a viable balance between mechanical performance and environmental impact, making it suitable for repair applications where sustainability is prioritized over peak strength performance.</p>

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Mechanical Performance and Sustainability of Rubberized Self-Compacting Concrete as a Repair Material: Insights from Bond Strength and Life Cycle Assessment

  • 期刊论文

  • 发表日期：

    2026年1月3日

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  • Peyman KordRostami,
  • Babak Aminnejad,
  • AliReza Lork,
  • Mehdi Dehestani

摘要

This study investigates the mechanical performance, bond behavior, and environmental efficiency of self-compacting concrete (SCC) incorporating recycled waste tire rubber for use as a sustainable repair material. Rubber powder was used to replace limestone powder, and rubber granules were used to replace fine aggregates at 10%, 20%, and 30% by volume. The effects of these substitutions were evaluated through fresh-state testing, mechanical strength assessment, interfacial bond characterization, microstructural analysis, and life cycle assessment (LCA). The slump flow diameter decreased from 52 cm (control) to 49–47 cm with increasing rubber content, while L-box values ranged from 1.00 (control) to 0.71. At 28 days, compressive strength declined from 37.7 to 32.4–21.5 MPa, and splitting tensile strength decreased from 1.14 to 1.05–0.49 MPa depending on rubber type and percentage. Despite these reductions, a notable enhancement in bi-surface shear bond strength was achieved in mixtures containing rubber powder, with the 30% replacement mix (CRLW3) reaching 3.20 MPa compared to 1.55 MPa for the control. SEM and ultrasonic pulse velocity (UPV) analyses revealed increased porosity, weaker rubber–paste interfaces, and UPV reductions of 1–12%, correlating with observed decreases in strength. LCA results demonstrated a substantial reduction of up to 45% in CO2 emissions relative to conventional SCC, highlighting the environmental benefits of incorporating recycled rubber. The findings indicate that rubberized SCC, particularly mixes containing fine rubber powder, offers a viable balance between mechanical performance and environmental impact, making it suitable for repair applications where sustainability is prioritized over peak strength performance.