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<p>The large quantities of granite waste (GW) and iron ore waste (IOW) generated worldwide, including in Egypt, pose serious environmental concerns. Given the growing demand for ultra-high-strength concrete, particularly in critical structures such as dams and nuclear power plants, the utilization of these waste materials has become strategically vital for sustainable development. Previous studies have rarely investigated the combined use of GW and IOW in ultra-high-strength green concrete (UHSGC), particularly in mixtures incorporating steel fibers and silica fume. This study evaluates the combined use of GW and IOW as partial replacements for natural aggregates and assesses their effects on the mechanical and microstructural performance of UHSGC. A mixture design was developed in which 50% of dolomite was replaced with GW and 40% of sand was substituted with IOW. Mechanical properties were assessed through compressive, splitting tensile, and flexural strength tests, and were supported by microstructural characterization using scanning electron microscopy (SEM) and X-ray diffraction (XRD). Results indicate that incorporating 50% GW improved the 28-day compressive, tensile, and flexural strengths by 3.9%, 26%, and 6.3%, respectively. Combining GW with IOW also enhanced early-age (3-day) strength. SEM observations suggest a denser, more homogeneous matrix, which may be associated with improved interfacial characteristics between GW and the cementitious matrix. Overall, the findings demonstrate that GW and IOW can be effectively utilized to produce UHSGC with enhanced mechanical performance, alongside environmental and economic advantages, including a reduction in production cost of up to 15%.</p>

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Influence of granite and iron ore waste incorporation on the mechanical behavior of ultra-high-strength concrete

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年6月28日

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  • Ahmed M. Elhussiny,
  • Mohamed H. Mourad,
  • Shady Rizk,
  • Ezzaat A. Sallam

摘要

The large quantities of granite waste (GW) and iron ore waste (IOW) generated worldwide, including in Egypt, pose serious environmental concerns. Given the growing demand for ultra-high-strength concrete, particularly in critical structures such as dams and nuclear power plants, the utilization of these waste materials has become strategically vital for sustainable development. Previous studies have rarely investigated the combined use of GW and IOW in ultra-high-strength green concrete (UHSGC), particularly in mixtures incorporating steel fibers and silica fume. This study evaluates the combined use of GW and IOW as partial replacements for natural aggregates and assesses their effects on the mechanical and microstructural performance of UHSGC. A mixture design was developed in which 50% of dolomite was replaced with GW and 40% of sand was substituted with IOW. Mechanical properties were assessed through compressive, splitting tensile, and flexural strength tests, and were supported by microstructural characterization using scanning electron microscopy (SEM) and X-ray diffraction (XRD). Results indicate that incorporating 50% GW improved the 28-day compressive, tensile, and flexural strengths by 3.9%, 26%, and 6.3%, respectively. Combining GW with IOW also enhanced early-age (3-day) strength. SEM observations suggest a denser, more homogeneous matrix, which may be associated with improved interfacial characteristics between GW and the cementitious matrix. Overall, the findings demonstrate that GW and IOW can be effectively utilized to produce UHSGC with enhanced mechanical performance, alongside environmental and economic advantages, including a reduction in production cost of up to 15%.