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<p>The rapid expansion of the road network in India over the last decade has generated a significant quantity of concrete waste aggregates (CWAs), leading to serious disposal and environmental concerns. Limited efforts toward developing innovative reuse technologies have accelerated the dumping of CWAs in landfill sites and water bodies. In this study, the feasibility of utilizing bitumen emulsion pre-treated CWAs in asphalt wearing course (WC) construction was investigated to promote sustainable pavement development. Response Surface Methodology (RSM) was employed as an optimization approach to evaluate the influence of key experimental variables, including bitumen content (VG30), percentage of pre-treated CWAs, and temperature, on the performance characteristics of asphalt mixtures. Marshall Stability, moisture resistance, stiffness, and volumetric properties were experimentally analysed and compared with MoRTH specifications. The results demonstrated that bitumen emulsion treatment significantly improved the engineering performance and durability characteristics of CWAs-based asphalt mixtures. Under optimized conditions of bitumen content = 4.79%, pre-treated CWAs = 21.02%, and temperature = 9.9&#xa0;°C, all response parameters were found to satisfy the permissible limits for WC construction materials. The study highlights the novelty of integrating CWAs, bitumen emulsion treatment, and RSM optimization for sustainable pavement applications. Overall, the findings confirm that treated CWAs can be effectively reused in road construction in India, thereby reducing environmental impacts associated with waste disposal and encouraging the development of sustainable construction practices and policies.</p>

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Assessment of construction waste aggregates as a road raw material using response surface methods

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年6月22日

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  • Vishal Dhiman,
  • Swasti Sharma,
  • Preetha Ravisree,
  • Shivangi Sharma

摘要

The rapid expansion of the road network in India over the last decade has generated a significant quantity of concrete waste aggregates (CWAs), leading to serious disposal and environmental concerns. Limited efforts toward developing innovative reuse technologies have accelerated the dumping of CWAs in landfill sites and water bodies. In this study, the feasibility of utilizing bitumen emulsion pre-treated CWAs in asphalt wearing course (WC) construction was investigated to promote sustainable pavement development. Response Surface Methodology (RSM) was employed as an optimization approach to evaluate the influence of key experimental variables, including bitumen content (VG30), percentage of pre-treated CWAs, and temperature, on the performance characteristics of asphalt mixtures. Marshall Stability, moisture resistance, stiffness, and volumetric properties were experimentally analysed and compared with MoRTH specifications. The results demonstrated that bitumen emulsion treatment significantly improved the engineering performance and durability characteristics of CWAs-based asphalt mixtures. Under optimized conditions of bitumen content = 4.79%, pre-treated CWAs = 21.02%, and temperature = 9.9 °C, all response parameters were found to satisfy the permissible limits for WC construction materials. The study highlights the novelty of integrating CWAs, bitumen emulsion treatment, and RSM optimization for sustainable pavement applications. Overall, the findings confirm that treated CWAs can be effectively reused in road construction in India, thereby reducing environmental impacts associated with waste disposal and encouraging the development of sustainable construction practices and policies.