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<p>This study investigates the impact of incorporating glass fiber as a reinforcement and Bentonite as a pozzolanic supplementary material on the mechanical and microstructural properties of concrete. Various percentages of glass fiber (0.3%, 0.5%, 0.7%, and 1% by weight of concrete) were studied, with the best outcomes observed at a 0.5% addition, resulting in a 1.5% boost in compressive strength and an impressive 29.4% enhancement in flexural strength. Subsequently, the optimal glass fiber ratio was combined with a partial replacement of cement with Bentonite calcined at 700&#xa0;°C, which possesses a silicon content of 65.34%. Mixes were created with 0.5% glass fiber and varying percentages (0%, 5%, 10%, 15%, and 20%) of cement replaced with Bentonite based on the cement weight. The maximum compressive strength was achieved with a 10% bentonite replacement, yielding a 3.94% enhancement, while flexural strength increased by 0.88&#xa0;MPa after 56&#xa0;days of curing. Hence, the combination of 0.5% glass fiber with 10% bentonite was identified as the ideal proportion to improve compressive and flexural strength. The microstructural examination revealed additional secondary cementitious materials identified as Pumpellyite resulting from the pozzolanic interaction between silicon in bentonite and calcium hydroxide in cement. Scanning electron microscopy (SEM) displayed a compact, less cracked structure with higher amounts of CH and C-S–H in the replaced mix. In conclusion, using 0.5% glass fiber and 10% bentonite as cement replacements collaboratively enhances concrete strength, reduces the environmental impact of cement production, and decreases the initial production cost of glass fiber-reinforced concrete by 3.72%.</p>

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Physio-Mechanical and Micro-Structural behavior of glass fibered concrete with partial replacement of cement by bentonite

  • 期刊论文

  • 发表日期：

    2025年11月15日

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  • Fikreyesus Demeke Cherkos,
  • Ethiopia Yirgawesen

摘要

This study investigates the impact of incorporating glass fiber as a reinforcement and Bentonite as a pozzolanic supplementary material on the mechanical and microstructural properties of concrete. Various percentages of glass fiber (0.3%, 0.5%, 0.7%, and 1% by weight of concrete) were studied, with the best outcomes observed at a 0.5% addition, resulting in a 1.5% boost in compressive strength and an impressive 29.4% enhancement in flexural strength. Subsequently, the optimal glass fiber ratio was combined with a partial replacement of cement with Bentonite calcined at 700 °C, which possesses a silicon content of 65.34%. Mixes were created with 0.5% glass fiber and varying percentages (0%, 5%, 10%, 15%, and 20%) of cement replaced with Bentonite based on the cement weight. The maximum compressive strength was achieved with a 10% bentonite replacement, yielding a 3.94% enhancement, while flexural strength increased by 0.88 MPa after 56 days of curing. Hence, the combination of 0.5% glass fiber with 10% bentonite was identified as the ideal proportion to improve compressive and flexural strength. The microstructural examination revealed additional secondary cementitious materials identified as Pumpellyite resulting from the pozzolanic interaction between silicon in bentonite and calcium hydroxide in cement. Scanning electron microscopy (SEM) displayed a compact, less cracked structure with higher amounts of CH and C-S–H in the replaced mix. In conclusion, using 0.5% glass fiber and 10% bentonite as cement replacements collaboratively enhances concrete strength, reduces the environmental impact of cement production, and decreases the initial production cost of glass fiber-reinforced concrete by 3.72%.