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<p>Conventional concrete relies heavily on natural coarse aggregates, the extraction of which contributes to environmental degradation, resource depletion, and the increasing environmental impact of construction activities. Overusing natural resources has created an urgent need for alternative building materials. Simultaneously, construction and demolition accumulate, creating additional ecological and logistical challenges. Recycled coarse aggregates (RCA) offer a practical solution by reducing dependence on natural aggregates and repurposing construction waste. However, concerns about mechanical performance and long-term durability have limited their use in structural concrete. This study presents a novel approach to enhancing M40-grade recycled aggregate concrete (RAC) by combining RCA with Portland Slag Cement, Alccofine, and alkali-resistant glass fibers. Unlike previous studies that focused solely on RCA replacement, this research explores multi-component optimization to enhance performance and durability. A total of 26 concrete mixes with varying RCA levels and combinations of these materials were systematically tested to evaluate their interactive effects. Experimental observations indicate that mixes incorporating partial RCA replacement along with Alccofine and glass fibers exhibit improved durability and enhanced resistance to acid attack. These enhancements are attributed to a stronger, more compact concrete structure, resulting in greater resilience. Multi-component mixes consistently outperformed than single-material mixes, demonstrating the benefits of combined optimization. Statistical analysis using response surface methodology confirmed the consistency and reliability of these trends. The findings indicate that properly engineered RAC can meet structural performance requirements while reducing dependence on natural aggregates and minimizing construction waste. This study offers practical guidance for designing RCA-based concrete for structural applications, thereby supporting the broader adoption of recycled materials in construction.</p>

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Mechanical and durability assessment of slag-based recycled aggregate concrete modified with glass fiber and alccofine

  • 期刊论文

  • 发表日期：

    2026年5月30日

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  • Govardhan Cheetirala,
  • V. Gayathri,
  • P. Eswaramoorthi

摘要

Conventional concrete relies heavily on natural coarse aggregates, the extraction of which contributes to environmental degradation, resource depletion, and the increasing environmental impact of construction activities. Overusing natural resources has created an urgent need for alternative building materials. Simultaneously, construction and demolition accumulate, creating additional ecological and logistical challenges. Recycled coarse aggregates (RCA) offer a practical solution by reducing dependence on natural aggregates and repurposing construction waste. However, concerns about mechanical performance and long-term durability have limited their use in structural concrete. This study presents a novel approach to enhancing M40-grade recycled aggregate concrete (RAC) by combining RCA with Portland Slag Cement, Alccofine, and alkali-resistant glass fibers. Unlike previous studies that focused solely on RCA replacement, this research explores multi-component optimization to enhance performance and durability. A total of 26 concrete mixes with varying RCA levels and combinations of these materials were systematically tested to evaluate their interactive effects. Experimental observations indicate that mixes incorporating partial RCA replacement along with Alccofine and glass fibers exhibit improved durability and enhanced resistance to acid attack. These enhancements are attributed to a stronger, more compact concrete structure, resulting in greater resilience. Multi-component mixes consistently outperformed than single-material mixes, demonstrating the benefits of combined optimization. Statistical analysis using response surface methodology confirmed the consistency and reliability of these trends. The findings indicate that properly engineered RAC can meet structural performance requirements while reducing dependence on natural aggregates and minimizing construction waste. This study offers practical guidance for designing RCA-based concrete for structural applications, thereby supporting the broader adoption of recycled materials in construction.