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<p>This study investigates the feasibility of using recycled concrete aggregate (RCA) and recycled asphalt pavement aggregate (RAA) in mass concrete by evaluating their thermal and mechanical properties. The effects of recycled aggregate (RA) content and water-cement ratio (W/C) on mechanical properties and thermal conductivity. The results showed that, compared with the control group, replacing natural aggregate with RCA reduced concrete compressive strength by 14.23–23.89%, whereas using RAA led to a more pronounced reduction of 42.86–48.41%. Thermal conductivity tests revealed that as the RA content increased, the thermal conductivity of both materials decreased significantly. Notably, RAA concrete exhibited a maximum reduction in thermal conductivity of 30.8%, demonstrating superior thermal insulation performance. By establishing a four-phase model comprising aggregate, old mortar/old asphalt, new mortar, and the interfacial transition zone (ITZ), the study revealed the evolution path and mechanistic differences from microcrack initiation to macroscopic failure. Finite-element thermal-conduction simulations further indicated that as the RAA content increased from 0 to 100%, the heat flow field gradually transitioned from a highly turbulent state to a more uniform distribution. Finally, the ideal point method was employed to determine optimal mix proportions for recycled aggregate concrete (RAC) satisfying three different compressive strength requirements, with comprehensive consideration of mechanical properties, thermal conductivity, carbon emissions, and cost-effectiveness.</p>

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Comparative on the regulation mechanism of recycled aggregates on the thermal-mechanical properties of concrete and application optimization

  • 期刊论文

  • 发表日期：

    2026年5月1日

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  • Dayang Wang,
  • Yongcheng Ji,
  • Chenxuan Lu,
  • Shuai Wang,
  • Yizhen Li,
  • Yanmin Jia

摘要

This study investigates the feasibility of using recycled concrete aggregate (RCA) and recycled asphalt pavement aggregate (RAA) in mass concrete by evaluating their thermal and mechanical properties. The effects of recycled aggregate (RA) content and water-cement ratio (W/C) on mechanical properties and thermal conductivity. The results showed that, compared with the control group, replacing natural aggregate with RCA reduced concrete compressive strength by 14.23–23.89%, whereas using RAA led to a more pronounced reduction of 42.86–48.41%. Thermal conductivity tests revealed that as the RA content increased, the thermal conductivity of both materials decreased significantly. Notably, RAA concrete exhibited a maximum reduction in thermal conductivity of 30.8%, demonstrating superior thermal insulation performance. By establishing a four-phase model comprising aggregate, old mortar/old asphalt, new mortar, and the interfacial transition zone (ITZ), the study revealed the evolution path and mechanistic differences from microcrack initiation to macroscopic failure. Finite-element thermal-conduction simulations further indicated that as the RAA content increased from 0 to 100%, the heat flow field gradually transitioned from a highly turbulent state to a more uniform distribution. Finally, the ideal point method was employed to determine optimal mix proportions for recycled aggregate concrete (RAC) satisfying three different compressive strength requirements, with comprehensive consideration of mechanical properties, thermal conductivity, carbon emissions, and cost-effectiveness.