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<p>The present work investigates the effect of substituting natural coarse aggregates (NCA) with recycled coarse aggregates (RCA) obtained from multiple recycling cycles on the flexural creep of concrete beams under sustained bending loads. Four types of concrete with the same water-to-cement ratio were analyzed: natural aggregates concrete (NC) and three generations of recycled aggregate concrete, where NCA was replaced by RCA in each generation, with volume substitution of 50 and 100%. Creep coefficients and creep deformations velocity were assessed for all concretes In addition, the flexural creep strains of concretes are predicted using Burger’s rheological model, which is the most widely model used to describe the viscoelastic materials properties. The experimental results show that multi-recycling has a negative impact on the flexural creep of concrete. An increase in recycling cycles and RCA content results in higher compressive and tensile creep as well as in the creep coefficient and creep velocity, but using 50% RCA has a lesser impact on this deformation. Finally, the compressive and tensile creep strains predicted using Burger’s rheological model demonstrate good consistency with the experimental investigations results over the assumed range of multi-recycling cycles, RCA volume substitution, and measurement durations.</p>

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Experimental study and viscoelastic modeling of the creep behavior of multi-recycled aggregates concrete

  • 期刊论文

  • 发表日期：

    2025年11月7日

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  • Oualid Belabbas,
  • Farid Bouziadi,
  • Bensaid Boulekbache,
  • Mostefa Hamrat,
  • Younes Nadour,
  • Abdelkader Haddi,
  • Sofiane Amziane

摘要

The present work investigates the effect of substituting natural coarse aggregates (NCA) with recycled coarse aggregates (RCA) obtained from multiple recycling cycles on the flexural creep of concrete beams under sustained bending loads. Four types of concrete with the same water-to-cement ratio were analyzed: natural aggregates concrete (NC) and three generations of recycled aggregate concrete, where NCA was replaced by RCA in each generation, with volume substitution of 50 and 100%. Creep coefficients and creep deformations velocity were assessed for all concretes In addition, the flexural creep strains of concretes are predicted using Burger’s rheological model, which is the most widely model used to describe the viscoelastic materials properties. The experimental results show that multi-recycling has a negative impact on the flexural creep of concrete. An increase in recycling cycles and RCA content results in higher compressive and tensile creep as well as in the creep coefficient and creep velocity, but using 50% RCA has a lesser impact on this deformation. Finally, the compressive and tensile creep strains predicted using Burger’s rheological model demonstrate good consistency with the experimental investigations results over the assumed range of multi-recycling cycles, RCA volume substitution, and measurement durations.