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<p>Demolition of structures generates a substantial amount of waste materials. The waste from demolished structures can be repurposed as aggregates in concrete. It was found that recycled coarse aggregates (RCA) can weaken the characteristics of concrete. The current study determines the effectiveness of using nano-silica (NS) in improving the properties of recycled aggregate concrete (RAC). This study determines the effect of NS on 100% RCA concrete with replacement of 1%, 2%, and 3% NS by weight of cement for water-to-binder ratio of 0.25 and 0.35. From the study, it is concluded that 2% NS by weight of cement was found to be the ideal, and increasing the quantity further led to a decline in the quality of concrete due to agglomeration of NS particles. RAC attained maximum compressive strength of 95.05&#xa0;MPa at 56&#xa0;days. The study found that RAC’s mechanical and durability characteristics can be improved significantly.</p>

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Mechanical and durability performance enhancement of recycled aggregate concrete using nano silica

  • 期刊论文

  • 发表日期：

    2025年7月17日

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  • Priyansh Nigam,
  • Rohit Rawat,
  • Dinakar Pasla

摘要

Demolition of structures generates a substantial amount of waste materials. The waste from demolished structures can be repurposed as aggregates in concrete. It was found that recycled coarse aggregates (RCA) can weaken the characteristics of concrete. The current study determines the effectiveness of using nano-silica (NS) in improving the properties of recycled aggregate concrete (RAC). This study determines the effect of NS on 100% RCA concrete with replacement of 1%, 2%, and 3% NS by weight of cement for water-to-binder ratio of 0.25 and 0.35. From the study, it is concluded that 2% NS by weight of cement was found to be the ideal, and increasing the quantity further led to a decline in the quality of concrete due to agglomeration of NS particles. RAC attained maximum compressive strength of 95.05 MPa at 56 days. The study found that RAC’s mechanical and durability characteristics can be improved significantly.