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<p>An effective management of Construction and demolition (C&amp;D) waste through recycling &amp; reuse offers a sustainable solution to reduce unwanted landfills and control the depletion of natural aggregates and improves the circular economy, i.e., recycled concrete aggregate (RCA); at the same time its adhered mortar can negatively impact which creates weaker interfacial transition zone (ITZ), it led to lowers the strength and higher water absorption, and low durability of concrete when compares to the natural aggregate concrete (NAC). The performance of RCA can be enhanced by various treatment methods such as chemical, mechanical, thermal, surface modification, slurry soaking, pre-wetting, carbonation curing, polymer, nano-material, bio-deposition and combined treatment methods like mechanical-chemical, thermal-mechanical, mechanical-slurry, microbial carbonation precipitation (MCP) etc. This review paper focuses on comparative studies on various treatment methods of RCA and mechanism, effect on mechanical and durability performance of recycled aggregate concrete (RAC), change in microstructure and scalability, limitations. Among all methods some highlighted based on maximum out-put, abrasion or mechanical treatment is easy method and cost effective, and suitable for large scale. Acid treatment increases the compressive strength at optimum replacement of 25%, which is highest strength among the isolated treatment methods and surface modification it acts like a sealer to reduce the water absorption. Combined treatment methods, each method have unique procedure which ensures the enhancement of properties of RAC and Bio-deposition is an eco-friendly treatment method. MCP produces the sustainable concrete and it captures the carbon in atmosphere. In spite of these properties this review also identifies the research gaps based on performance of RCA and practical applications of treatment of RCA in real time projects has been incorporated. Future studies suggested to the evaluation of advanced treatment techniques and life cycle assessment analysis production of process of RCA.</p>

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A review on construction and demolition waste (C & D) recycled aggregates: T reatment process, strength and durability properties in concrete

  • 期刊论文

  • 发表日期：

    2026年8月4日

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  • Mounika Perla,
  • Sofi Androse Joseph

摘要

An effective management of Construction and demolition (C&D) waste through recycling & reuse offers a sustainable solution to reduce unwanted landfills and control the depletion of natural aggregates and improves the circular economy, i.e., recycled concrete aggregate (RCA); at the same time its adhered mortar can negatively impact which creates weaker interfacial transition zone (ITZ), it led to lowers the strength and higher water absorption, and low durability of concrete when compares to the natural aggregate concrete (NAC). The performance of RCA can be enhanced by various treatment methods such as chemical, mechanical, thermal, surface modification, slurry soaking, pre-wetting, carbonation curing, polymer, nano-material, bio-deposition and combined treatment methods like mechanical-chemical, thermal-mechanical, mechanical-slurry, microbial carbonation precipitation (MCP) etc. This review paper focuses on comparative studies on various treatment methods of RCA and mechanism, effect on mechanical and durability performance of recycled aggregate concrete (RAC), change in microstructure and scalability, limitations. Among all methods some highlighted based on maximum out-put, abrasion or mechanical treatment is easy method and cost effective, and suitable for large scale. Acid treatment increases the compressive strength at optimum replacement of 25%, which is highest strength among the isolated treatment methods and surface modification it acts like a sealer to reduce the water absorption. Combined treatment methods, each method have unique procedure which ensures the enhancement of properties of RAC and Bio-deposition is an eco-friendly treatment method. MCP produces the sustainable concrete and it captures the carbon in atmosphere. In spite of these properties this review also identifies the research gaps based on performance of RCA and practical applications of treatment of RCA in real time projects has been incorporated. Future studies suggested to the evaluation of advanced treatment techniques and life cycle assessment analysis production of process of RCA.