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<p>Many high-performance concrete (HPC) applications are often supported by additional cementitious materials for mechanical properties such as strength and performance. This research works to determine the possibility of using the waste glass powder (WGP) obtained by grinding crushed ground waste glass bottles to partially replace silica fume (SF) in HPC. 10%, 20%, and 25% replacement, which comprised the same water-to-binder ratio and workability conditions, were verified. After being subjected to 750&#xa0;°C for 2&#xa0;h, the experimental program was developed and evaluated with regard to compressive strength, flexural strength, and residual compressive strength, which resulted in the best measured compressive strength of SF mixtures occurring with 10% replacement, reaching 108&#xa0;MPa at 28 days, and higher values obtained with 20% replacement in WGP mixtures from 113.2&#xa0;MPa. There is no large variation of flexural strength between the tested mixtures except for the highest measured value of 8.4&#xa0;MPa at WGP at 20%. The residual compressive strengths in WGP mixtures before and after being exposed to high temperatures were higher than in their respective SF mixtures under the laboratory conditions. These findings indicate that the WGP is a potential alternative supplementary cementitious material in HPC in the examined replacement range. However, this performance should be taken to provide a comparative evaluation within the tested program, and additional microstructural studies are needed to confirm the proposed mechanism of increased heat.</p>

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Investigating the possibility of substituting silica fume by wasted glass powder in high-performance concrete

  • 期刊论文

  • 发表日期：

    2026年5月25日

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  • Sawsan Kareem,
  • Noor Al-Rubaie,
  • Samer Almashhadi,
  • Salwa R. Jassim

摘要

Many high-performance concrete (HPC) applications are often supported by additional cementitious materials for mechanical properties such as strength and performance. This research works to determine the possibility of using the waste glass powder (WGP) obtained by grinding crushed ground waste glass bottles to partially replace silica fume (SF) in HPC. 10%, 20%, and 25% replacement, which comprised the same water-to-binder ratio and workability conditions, were verified. After being subjected to 750 °C for 2 h, the experimental program was developed and evaluated with regard to compressive strength, flexural strength, and residual compressive strength, which resulted in the best measured compressive strength of SF mixtures occurring with 10% replacement, reaching 108 MPa at 28 days, and higher values obtained with 20% replacement in WGP mixtures from 113.2 MPa. There is no large variation of flexural strength between the tested mixtures except for the highest measured value of 8.4 MPa at WGP at 20%. The residual compressive strengths in WGP mixtures before and after being exposed to high temperatures were higher than in their respective SF mixtures under the laboratory conditions. These findings indicate that the WGP is a potential alternative supplementary cementitious material in HPC in the examined replacement range. However, this performance should be taken to provide a comparative evaluation within the tested program, and additional microstructural studies are needed to confirm the proposed mechanism of increased heat.