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<p>This study evaluates the performance of self-compacting geopolymer concrete (SCGC) incorporating fly ash (FA), ground granulated blast furnace slag (GGBFS), and recycled concrete aggregates (RCA). Five SCGC mixtures with varying RCA content (0%, 50%, 100%) and GGBFS substitution levels (0%, 30%, 50%) are examined for fresh properties, physical characteristics (density, porosity, water absorption), mechanical performance (compressive strength, ultrasonic pulse velocity), and durability (water penetration, freeze–thaw resistance, drying shrinkage). Results show that both RCA and GGBFS slightly reduce workability, although all mixtures remained within EFNARC limits. As anticipated, increasing RCA content leads to higher porosity, water absorption, and reduces compressive strength, whereas partial replacement of FA with GGBFS compensates for these weaknesses and significantly enhances strength, ultrasonic pulse velocity, and dynamic modulus of elasticity. RCA adversely affects durability, increasing water penetration by 38% and reducing freeze–thaw resistance and shrinkage performance, whereas GGBFS improves microstructural density, reduces permeability, and enhances freeze–thaw resistance, albeit with a modest increase in free drying shrinkage. Overall, the findings demonstrate that SCGC containing up to 100% RCA combined with partial GGBFS replacement can achieve sustainable concrete with satisfactory mechanical and durability performance, highlighting its potential for more sustainable construction.</p>

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Physical and durability characteristics of fly ash based self-compacting geopolymer concrete incorporating recycled concrete aggregates and ground granulated blast furnace slag

  • 期刊论文

  • 发表日期：

    2026年5月19日

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  • Aryan Far H. Sherwani,
  • Khaleel H. Younis,
  • Ralf W. Arndt,
  • Kypros Pilakoutas

摘要

This study evaluates the performance of self-compacting geopolymer concrete (SCGC) incorporating fly ash (FA), ground granulated blast furnace slag (GGBFS), and recycled concrete aggregates (RCA). Five SCGC mixtures with varying RCA content (0%, 50%, 100%) and GGBFS substitution levels (0%, 30%, 50%) are examined for fresh properties, physical characteristics (density, porosity, water absorption), mechanical performance (compressive strength, ultrasonic pulse velocity), and durability (water penetration, freeze–thaw resistance, drying shrinkage). Results show that both RCA and GGBFS slightly reduce workability, although all mixtures remained within EFNARC limits. As anticipated, increasing RCA content leads to higher porosity, water absorption, and reduces compressive strength, whereas partial replacement of FA with GGBFS compensates for these weaknesses and significantly enhances strength, ultrasonic pulse velocity, and dynamic modulus of elasticity. RCA adversely affects durability, increasing water penetration by 38% and reducing freeze–thaw resistance and shrinkage performance, whereas GGBFS improves microstructural density, reduces permeability, and enhances freeze–thaw resistance, albeit with a modest increase in free drying shrinkage. Overall, the findings demonstrate that SCGC containing up to 100% RCA combined with partial GGBFS replacement can achieve sustainable concrete with satisfactory mechanical and durability performance, highlighting its potential for more sustainable construction.