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<p>Concrete production requires appropriate grading of both recycled and conventional aggregates. Recycling coarse aggregates from waste concrete involves crushing, yielding grading characteristics similar to those of virgin aggregates. However, recycled aggregates exhibit a different shape index compared to conventional aggregates. The superior shape characteristics of recycled aggregates facilitate their use in concrete production. This study investigates the feasibility of recycled aggregate concrete as a structural material, focusing on fresh and mechanical properties. Beams were cast and tested using recycled coarse aggregate at replacement levels of 5%, 10%, 15%, and 20%, combined with three different arrangements of transverse reinforcement. The results demonstrate that workability decreases progressively from 65&#xa0;mm slump at 5% replacement to 41&#xa0;mm at 20% replacement, while compressive strength declines from 34.2&#xa0;MPa to 30.2&#xa0;MPa, flexural strength from 3.4&#xa0;MPa to 3.0&#xa0;MPa, and split tensile strength from 2.5&#xa0;MPa to 1.9&#xa0;MPa. The optimal replacement level for maintaining acceptable structural performance while maximizing recycled material utilization is identified as 10–15%, beyond which strength reduction becomes more pronounced. The novelty of this study lies in the simultaneous evaluation of workability, compressive, flexural, and split tensile properties across incremental replacement levels, providing a comprehensive basis for mix design recommendations in structural applications.</p>

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The role of recycled concrete materials in building sustainable infrastructure

  • 期刊论文

  • 发表日期：

    2026年7月14日

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  • Amit Dutt,
  • Yalla Jeevan Nagendra Kumar,
  • Pankaj Kumar,
  • Ashish Parmar,
  • B. Swarna,
  • Ravi Shankar Raman

摘要

Concrete production requires appropriate grading of both recycled and conventional aggregates. Recycling coarse aggregates from waste concrete involves crushing, yielding grading characteristics similar to those of virgin aggregates. However, recycled aggregates exhibit a different shape index compared to conventional aggregates. The superior shape characteristics of recycled aggregates facilitate their use in concrete production. This study investigates the feasibility of recycled aggregate concrete as a structural material, focusing on fresh and mechanical properties. Beams were cast and tested using recycled coarse aggregate at replacement levels of 5%, 10%, 15%, and 20%, combined with three different arrangements of transverse reinforcement. The results demonstrate that workability decreases progressively from 65 mm slump at 5% replacement to 41 mm at 20% replacement, while compressive strength declines from 34.2 MPa to 30.2 MPa, flexural strength from 3.4 MPa to 3.0 MPa, and split tensile strength from 2.5 MPa to 1.9 MPa. The optimal replacement level for maintaining acceptable structural performance while maximizing recycled material utilization is identified as 10–15%, beyond which strength reduction becomes more pronounced. The novelty of this study lies in the simultaneous evaluation of workability, compressive, flexural, and split tensile properties across incremental replacement levels, providing a comprehensive basis for mix design recommendations in structural applications.