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<p>The excessive generation of non-biodegradable scrap tyres presents a significant environmental challenge, necessitating the development of sustainable and effective management strategies. One such approach involves the use of crumb rubber aggregate (RA) as a partial replacement for fine aggregate (FA) in concrete, creating crumb rubber concrete (CRC). However, CRC exhibits diminished mechanical properties under elevated temperature conditions compared to conventional concrete mixes. To mitigate the adverse effects of high temperatures on CRC, this study investigates the incorporation of nanomaterials—specifically nano-silica (NS) and multi-walled carbon nanotubes (MWCNTs)—as performance-enhancing additives. CRC mixes containing 5% to 15% RA were subjected to elevated temperatures ranging from 200&#xa0;°C to 600&#xa0;°C. Comprehensive analyses of mass loss, residual compressive strength, residual split tensile strength, and residual flexural strength (modulus of rupture) were conducted to assess the performance of nano-enhanced CRC—namely, NS-incorporated CRC (NS-CRC) and MWCNT-incorporated CRC (MWCNTs-CRC). Results revealed greater mass loss and a decline in mechanical strength with increasing temperature, compared to conventional concrete in CRC. Including NS and MWCNTs in CRC reduced the mass loss by up to 7.22% and 8.88%, respectively, at 600&#xa0;°C. Notably, CRC incorporating NS exhibited remarkable residual strengths at 600&#xa0;°C: 62.58% in compressive strength, 45.12% in tensile strength, and 50% in flexural strength. In the case of MWCNTs, the most significant improvement was observed in CRC mixes containing 0.2% MWCNTs. Overall, the findings indicate that while both nanomaterials improve the high-temperature performance of CRC, NS demonstrates slightly superior fire resistance properties compared to MWCNTs.</p>

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Impact of nano-silica and multi-walled carbon nanotubes on the fire resistance performance of rubberized concrete

  • 期刊论文

  • 发表日期：

    2025年7月21日

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  • Gyanendra Kumar Chaturvedy,
  • Umesh Kumar Pandey,
  • Govind Mohan

摘要

The excessive generation of non-biodegradable scrap tyres presents a significant environmental challenge, necessitating the development of sustainable and effective management strategies. One such approach involves the use of crumb rubber aggregate (RA) as a partial replacement for fine aggregate (FA) in concrete, creating crumb rubber concrete (CRC). However, CRC exhibits diminished mechanical properties under elevated temperature conditions compared to conventional concrete mixes. To mitigate the adverse effects of high temperatures on CRC, this study investigates the incorporation of nanomaterials—specifically nano-silica (NS) and multi-walled carbon nanotubes (MWCNTs)—as performance-enhancing additives. CRC mixes containing 5% to 15% RA were subjected to elevated temperatures ranging from 200 °C to 600 °C. Comprehensive analyses of mass loss, residual compressive strength, residual split tensile strength, and residual flexural strength (modulus of rupture) were conducted to assess the performance of nano-enhanced CRC—namely, NS-incorporated CRC (NS-CRC) and MWCNT-incorporated CRC (MWCNTs-CRC). Results revealed greater mass loss and a decline in mechanical strength with increasing temperature, compared to conventional concrete in CRC. Including NS and MWCNTs in CRC reduced the mass loss by up to 7.22% and 8.88%, respectively, at 600 °C. Notably, CRC incorporating NS exhibited remarkable residual strengths at 600 °C: 62.58% in compressive strength, 45.12% in tensile strength, and 50% in flexural strength. In the case of MWCNTs, the most significant improvement was observed in CRC mixes containing 0.2% MWCNTs. Overall, the findings indicate that while both nanomaterials improve the high-temperature performance of CRC, NS demonstrates slightly superior fire resistance properties compared to MWCNTs.