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<p>Urban development results in increased ceramic waste (CW), posing environmental challenges due to its fragility and non-biodegradability. Addressing these issues, particularly the environmental impact of cement production and aggregate extraction, is crucial. This study investigated the environmental benefits of utilizing ceramic waste powder (CWP) and ceramic waste aggregate (CWA) in steel fiber-reinforced self-compacting concrete (SFRSCC). It analyzes the impact of varying proportions of CWP (0%, 5%, 15%, and 25%) and CWA (0%, 20%, 40%, and 60%) on workability, compressive, tensile, and flexural strength, aiming to enhance the mechanical properties and durability of CW-SFRSCC. Tests on fresh concrete revealed that a mix with 25% CWP and 60% CWA decreases workability, flowability, passability, fillability, and segregation. However, the flexural, tensile, and compressive strengths of the 90-day concrete containing 15% CWP and 40% CWA increased by 27.89%, 27.55%, and 24.84%, respectively, compared to the control mix. When a high volume of CWs was incorporated (25% CWP and 60% CWA), the concrete microstructure exhibited a porous nature and contained a substantial amount of non-hydrated particles. At a constant volume of 15% CWP, concrete with 40% CWA exhibited optimal performance in wave velocity, electrical resistance, and capillary water absorption at all ages. At 90&#xa0;days, using 15% CWP and 20% CWA led to reductions of 38.10% in water penetration depth and 41.79% in surface water absorption, compared to concrete without ceramic waste. Additionally, substituting ceramic waste for cement and natural coarse aggregates reduced the weight of the concrete by approximately 7%. Furthermore, increasing the use of CWs reduced production costs by between 1.63 and 6.63% compared to the control mix. When the maximum volume of CW was utilized, CO<sub>2</sub> emissions are reduced by approximately 22.56%, indicating the positive environmental impacts of producing concrete containing CWP and CWA. Scanning electron microscopy images revealed that the microstructure of the SFRSCC containing 15% CWP and 40% CWA displayed a denser, more coherent, and more uniform texture. Using CWA and CWP in SFRSCC provides a scientific and practical solution to the environmental challenges posed by cement production and natural materials, while also reducing costs and minimizing land use for disposing of ceramic waste.</p>

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Experimental investigation of mechanical properties and durability of SFR-SCC incorporating ceramic waste powder and coarse aggregates

  • 期刊论文

  • 发表日期：

    2025年4月11日

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  • Naser Safaeian Hamzehkolaei,
  • Iman Afshoon

摘要

Urban development results in increased ceramic waste (CW), posing environmental challenges due to its fragility and non-biodegradability. Addressing these issues, particularly the environmental impact of cement production and aggregate extraction, is crucial. This study investigated the environmental benefits of utilizing ceramic waste powder (CWP) and ceramic waste aggregate (CWA) in steel fiber-reinforced self-compacting concrete (SFRSCC). It analyzes the impact of varying proportions of CWP (0%, 5%, 15%, and 25%) and CWA (0%, 20%, 40%, and 60%) on workability, compressive, tensile, and flexural strength, aiming to enhance the mechanical properties and durability of CW-SFRSCC. Tests on fresh concrete revealed that a mix with 25% CWP and 60% CWA decreases workability, flowability, passability, fillability, and segregation. However, the flexural, tensile, and compressive strengths of the 90-day concrete containing 15% CWP and 40% CWA increased by 27.89%, 27.55%, and 24.84%, respectively, compared to the control mix. When a high volume of CWs was incorporated (25% CWP and 60% CWA), the concrete microstructure exhibited a porous nature and contained a substantial amount of non-hydrated particles. At a constant volume of 15% CWP, concrete with 40% CWA exhibited optimal performance in wave velocity, electrical resistance, and capillary water absorption at all ages. At 90 days, using 15% CWP and 20% CWA led to reductions of 38.10% in water penetration depth and 41.79% in surface water absorption, compared to concrete without ceramic waste. Additionally, substituting ceramic waste for cement and natural coarse aggregates reduced the weight of the concrete by approximately 7%. Furthermore, increasing the use of CWs reduced production costs by between 1.63 and 6.63% compared to the control mix. When the maximum volume of CW was utilized, CO2 emissions are reduced by approximately 22.56%, indicating the positive environmental impacts of producing concrete containing CWP and CWA. Scanning electron microscopy images revealed that the microstructure of the SFRSCC containing 15% CWP and 40% CWA displayed a denser, more coherent, and more uniform texture. Using CWA and CWP in SFRSCC provides a scientific and practical solution to the environmental challenges posed by cement production and natural materials, while also reducing costs and minimizing land use for disposing of ceramic waste.