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<p>The paving industry faces significant challenges due to the depletion of natural resources required for infrastructure development. At the same time, industrial advancements have generated large quantities of waste. This study addresses both of the above mentioned concerns by the development of an eco-friendly pavement-quality concrete (PQC) using unique combinations of industrial and construction demolition waste materials. This research uses sodium silicate solution-treated recycled concrete aggregate (TRCA) to replace natural coarse aggregates (NCA). At the same time, locally available fly ash (FA) and copper slag (CS) are used to partially replace Ordinary Portland Cement (OPC) and river sand (RS), respectively. The study explores various levels of FA replacement with OPC and RS replacement with CS in M40 grade PQC (with 28-day characteristic strength of 40&#xa0;MPa), comprising 14 distinct mixes. The results indicate that the mix with 20% FA replacement level and 60% CS replacement with 100% TRCA provides superior workability, density, mechanical strength and fatigue life. Statistical analysis supports the findings of this study while a life-cycle assessment shows notable reductions in environmental impact parameters for the optimal mix. This research highlights the potential of utilising waste materials to produce eco-friendly and high-performing paving concrete.</p>

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Incorporating industrial by-products and treated recycled concrete aggregates in pavement quality concrete: a step towards green infrastructure

  • 期刊论文

  • 发表日期：

    2026年4月28日

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  • Siddharth Shankar Pradhan,
  • Atharaw Kumar,
  • Abinash Chandra Pal,
  • Aditya Kumar Das,
  • Mahabir Panda,
  • Pradip Sarkar

摘要

The paving industry faces significant challenges due to the depletion of natural resources required for infrastructure development. At the same time, industrial advancements have generated large quantities of waste. This study addresses both of the above mentioned concerns by the development of an eco-friendly pavement-quality concrete (PQC) using unique combinations of industrial and construction demolition waste materials. This research uses sodium silicate solution-treated recycled concrete aggregate (TRCA) to replace natural coarse aggregates (NCA). At the same time, locally available fly ash (FA) and copper slag (CS) are used to partially replace Ordinary Portland Cement (OPC) and river sand (RS), respectively. The study explores various levels of FA replacement with OPC and RS replacement with CS in M40 grade PQC (with 28-day characteristic strength of 40 MPa), comprising 14 distinct mixes. The results indicate that the mix with 20% FA replacement level and 60% CS replacement with 100% TRCA provides superior workability, density, mechanical strength and fatigue life. Statistical analysis supports the findings of this study while a life-cycle assessment shows notable reductions in environmental impact parameters for the optimal mix. This research highlights the potential of utilising waste materials to produce eco-friendly and high-performing paving concrete.