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<p>The use of recycled aggregates in geopolymer concrete (GPC) enhances environmental sustainability but compromises performance, limiting its broader application. This study investigated the strength, durability, and microstructure of GPC made with 100% recycled coarse aggregates and partially replaced recycled fine aggregates. Performance improvements were achieved by partially replacing fly ash with cement and incorporating graphite nano/micro platelets (GNMP) as an additive. The developed concrete samples were cured under two separate conditions i.e. heat curing and ambient curing to check the effect of curing conditions. The performance of enhanced geopolymer recycled aggregates concrete (GRAC) was evaluated based on workability, mechanical properties (including compressive strength, splitting tensile strength, and flexural strength), durability properties (including sorptivity, water absorption, seawater resistance, and resistance to acid attack) and microstructure analysis through scanning electron microscopy. The results indicated that 20% OPC enhanced the strength properties of GRAC, while 0.3% GNMP improved its durability properties, particularly under ambient curing conditions. These findings underscore the potential for sustainable, high-performance GPC through optimized material combinations and curing conditions, advancing its practical application in eco-friendly construction.</p>

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Performance evaluation of sustainable recycled aggregates geopolymer concrete using cement and graphite nano/micro platelets under heat and ambient curing

  • 期刊论文

  • 发表日期：

    2025年3月17日

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  • Shahzadi Irum,
  • Faisal Shabbir,
  • Hammad Salahuddin,
  • Rana Muhammad Waqas

摘要

The use of recycled aggregates in geopolymer concrete (GPC) enhances environmental sustainability but compromises performance, limiting its broader application. This study investigated the strength, durability, and microstructure of GPC made with 100% recycled coarse aggregates and partially replaced recycled fine aggregates. Performance improvements were achieved by partially replacing fly ash with cement and incorporating graphite nano/micro platelets (GNMP) as an additive. The developed concrete samples were cured under two separate conditions i.e. heat curing and ambient curing to check the effect of curing conditions. The performance of enhanced geopolymer recycled aggregates concrete (GRAC) was evaluated based on workability, mechanical properties (including compressive strength, splitting tensile strength, and flexural strength), durability properties (including sorptivity, water absorption, seawater resistance, and resistance to acid attack) and microstructure analysis through scanning electron microscopy. The results indicated that 20% OPC enhanced the strength properties of GRAC, while 0.3% GNMP improved its durability properties, particularly under ambient curing conditions. These findings underscore the potential for sustainable, high-performance GPC through optimized material combinations and curing conditions, advancing its practical application in eco-friendly construction.