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<p>Metakaolin-based concrete provided a sustainable and eco-friendly alternative to conventional concrete by incorporating industrial by-products, aligning with the global need for greener construction practices. This study investigated the potential of partially replacing cement with metakaolin to improve its properties. The primary objectives were to evaluate the compressive strength, tensile strength, durability, workability, and economic viability of metakaolin-enhanced M35-grade concrete. The methodology involved replacing cement with metakaolin at varying percentages by mass (0%, 5%, 10%, 15%, 20%, and 25%), maintaining a consistent water-to-cement ratio of 0.35, and utilizing the superplasticizer Aeromax 400 to ensure adequate workability. Comprehensive tests were conducted to assess mechanical properties, durability (water permeability, water absorption, chloride penetration), and workability (slump). The results indicated that 15% metakaolin replacement achieved optimal performance, with a 27.05% increase in compressive strength and a 25% improvement in split tensile strength compared to control concrete. Durability parameters significantly improved at 25% replacement, demonstrating reduced water permeability, lower water absorption, and decreased chloride penetration. While a decrease in workability was observed with higher metakaolin content, the addition of superplasticizer mitigated this issue.</p><p>In conclusion, metakaolin-enhanced concrete offered notable improvements in strength and durability while maintaining cost-effectiveness, making it an ideal material for long-term rehabilitation and repair projects. This novel approach in understanding concrete’s increased performance aids in developing more robust structures, making it an excellent choice while ensuring a longer service life with low maintenance costs.</p>

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Metakaolin-infused concrete for sustainable and durable building rehabilitation

  • 期刊论文

  • 发表日期：

    2025年2月10日

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  • Shahida Khan,
  • Malik parveez,
  • Manzoor Ahmad Tantray

摘要

Metakaolin-based concrete provided a sustainable and eco-friendly alternative to conventional concrete by incorporating industrial by-products, aligning with the global need for greener construction practices. This study investigated the potential of partially replacing cement with metakaolin to improve its properties. The primary objectives were to evaluate the compressive strength, tensile strength, durability, workability, and economic viability of metakaolin-enhanced M35-grade concrete. The methodology involved replacing cement with metakaolin at varying percentages by mass (0%, 5%, 10%, 15%, 20%, and 25%), maintaining a consistent water-to-cement ratio of 0.35, and utilizing the superplasticizer Aeromax 400 to ensure adequate workability. Comprehensive tests were conducted to assess mechanical properties, durability (water permeability, water absorption, chloride penetration), and workability (slump). The results indicated that 15% metakaolin replacement achieved optimal performance, with a 27.05% increase in compressive strength and a 25% improvement in split tensile strength compared to control concrete. Durability parameters significantly improved at 25% replacement, demonstrating reduced water permeability, lower water absorption, and decreased chloride penetration. While a decrease in workability was observed with higher metakaolin content, the addition of superplasticizer mitigated this issue.

In conclusion, metakaolin-enhanced concrete offered notable improvements in strength and durability while maintaining cost-effectiveness, making it an ideal material for long-term rehabilitation and repair projects. This novel approach in understanding concrete’s increased performance aids in developing more robust structures, making it an excellent choice while ensuring a longer service life with low maintenance costs.