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<p>Rapid urbanization, population growth, and frequent natural and man-made disasters have significantly increased the production of construction and demolition waste (CDW), exacerbating ecological and environmental issues. Titanium dioxide (TD), commonly used in cosmetics, paints, and disinfectants, is being increasingly utilized in cement and concrete due to its self-cleansing, antibacterial, depolluting and photocatalytic properties. An extensive study on nano-scale TD has been conducted, while relatively limited research has been done on micro-scale TD, despite its economic and safety advantages. This observation has been reported in previous studies on micro-TD. Furthermore, the combination of micro-TD with steel fibres and recycled aggregate has received limited attention. This study examines the impact of partially replacing cement with micro-TD on the fresh and mechanical properties of recycled aggregate concrete (RAC) reinforced with 1% steel fibres. Nine concrete mixes were prepared by replacing natural coarse aggregate (NA) with recycled coarse aggregate (RA) derived from CDW at ratios of 25%, 50% and 100%. Additionally, cement was partially replaced with micro-TD at 5%, 10% and 15% by weight. To enhance crack resistance and ductility, 1% of hooked-end steel fibres (SF) were added to all mixes. Throughout this study, the Two Stage Mixing Approach (TSMA) method of mixing was used and RA was utilized without any pre-treatment. Tests for workability, compressive strength, splitting tensile strength, and flexural strength were conducted and compared with control concrete made using NA. The results indicated that workability decreased with increasing replacement ratios of RA and micro-TD. The mix with 25% RA replacement and 10% micro-TD showed the highest improvements, with increases of 12.54%, 63.81%, and 35.93% in compressive strength, splitting tensile strength, and flexural strength respectively. Utilizing recycled coarse aggregates in concrete reduces the demand for natural aggregates, thereby conserving natural resources and minimizing environmental impact. The addition of micro-TD and steel fibres further enhances the performance of RAC, making it a more viable and sustainable construction material.</p>

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Enhancing the mechanical performance of recycled aggregate concrete: the synergistic effects of micro titanium dioxide and steel fibres

  • 期刊论文

  • 发表日期：

    2025年2月21日

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  • K. Pushpa,
  • S. Jayakumar,
  • N. Pannirselvam

摘要

Rapid urbanization, population growth, and frequent natural and man-made disasters have significantly increased the production of construction and demolition waste (CDW), exacerbating ecological and environmental issues. Titanium dioxide (TD), commonly used in cosmetics, paints, and disinfectants, is being increasingly utilized in cement and concrete due to its self-cleansing, antibacterial, depolluting and photocatalytic properties. An extensive study on nano-scale TD has been conducted, while relatively limited research has been done on micro-scale TD, despite its economic and safety advantages. This observation has been reported in previous studies on micro-TD. Furthermore, the combination of micro-TD with steel fibres and recycled aggregate has received limited attention. This study examines the impact of partially replacing cement with micro-TD on the fresh and mechanical properties of recycled aggregate concrete (RAC) reinforced with 1% steel fibres. Nine concrete mixes were prepared by replacing natural coarse aggregate (NA) with recycled coarse aggregate (RA) derived from CDW at ratios of 25%, 50% and 100%. Additionally, cement was partially replaced with micro-TD at 5%, 10% and 15% by weight. To enhance crack resistance and ductility, 1% of hooked-end steel fibres (SF) were added to all mixes. Throughout this study, the Two Stage Mixing Approach (TSMA) method of mixing was used and RA was utilized without any pre-treatment. Tests for workability, compressive strength, splitting tensile strength, and flexural strength were conducted and compared with control concrete made using NA. The results indicated that workability decreased with increasing replacement ratios of RA and micro-TD. The mix with 25% RA replacement and 10% micro-TD showed the highest improvements, with increases of 12.54%, 63.81%, and 35.93% in compressive strength, splitting tensile strength, and flexural strength respectively. Utilizing recycled coarse aggregates in concrete reduces the demand for natural aggregates, thereby conserving natural resources and minimizing environmental impact. The addition of micro-TD and steel fibres further enhances the performance of RAC, making it a more viable and sustainable construction material.