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<p>The environmental impact of conventional concrete underscores the urgent need for sustainable alternatives. Alkali-activated slag (AAS) concrete offers a lower-carbon solution, Yet its performance remains open to optimization. This study evaluates the mechanical and durability enhancements achieved by partially substituting slag with 10–50% locally available feldspar powder. The optimal replacement level of 10% is shown to provide a synergistic performance enhancement, not only improving flexural strength (24.58% at 7 days) but also, for the first time, demonstrating a significant reduction in abrasion wear (10.33%), a 15.5% improvement in water permeability, and a crucial mitigation of drying shrinkage. These findings move beyond simple strength optimization to validate 10% feldspar as a strategic additive for producing a holistically durable and serviceable AAS concrete. Microstructural evidence attributes these gains to feldspar’s role in refining pore structure and promoting the development of a dense, chemically complex sodium aluminosilicate hydrate (N-A-S-H) binder matrix. Beyond 10%, performance declines due to porosity increase and incomplete reaction. These findings support feldspar’s viability as a strategic additive in AAS concrete, aligning with global efforts to decarbonize construction.</p>

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Egyptian feldspar for multidimensional performance boosts in alkali-activated slag concrete

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年9月23日

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  • Alaa M. Rashad,
  • Youssef A. Mosleh,
  • Ghada M. F. Essa

摘要

The environmental impact of conventional concrete underscores the urgent need for sustainable alternatives. Alkali-activated slag (AAS) concrete offers a lower-carbon solution, Yet its performance remains open to optimization. This study evaluates the mechanical and durability enhancements achieved by partially substituting slag with 10–50% locally available feldspar powder. The optimal replacement level of 10% is shown to provide a synergistic performance enhancement, not only improving flexural strength (24.58% at 7 days) but also, for the first time, demonstrating a significant reduction in abrasion wear (10.33%), a 15.5% improvement in water permeability, and a crucial mitigation of drying shrinkage. These findings move beyond simple strength optimization to validate 10% feldspar as a strategic additive for producing a holistically durable and serviceable AAS concrete. Microstructural evidence attributes these gains to feldspar’s role in refining pore structure and promoting the development of a dense, chemically complex sodium aluminosilicate hydrate (N-A-S-H) binder matrix. Beyond 10%, performance declines due to porosity increase and incomplete reaction. These findings support feldspar’s viability as a strategic additive in AAS concrete, aligning with global efforts to decarbonize construction.