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<p>This study investigates lightweight engineered geopolymer composites (LEGCs) reinforced with multi-walled carbon nanotubes (MWCNTs) and optimized lightweight aggregates (LWAs) for improved performance under elevated temperatures. LEGCs were developed using industrial byproducts and evaluated for their mechanical strength, dimensional stability, and microstructural integrity after exposure to high thermal conditions. The results showed that moderate heating enhanced matrix densification, while higher temperatures caused microcracking and phase changes. Moderate heating (200°C) enhanced compressive strength by 27.27% due to matrix densification, while severe degradation at 800°C led to strength losses of 135.71%. Incorporating shale-, clay-, and slag-based ceramsite aggregates significantly influenced thermal resistance, with shale-based composites showing comparatively higher stability at extreme temperatures. MWCNTs effectively bridged microcracks and improved structural integrity, contributing to superior strength retention and reduced shrinkage. Microstructural analyses (SEM, XRD, FTIR) confirmed the role of optimized LWAs and MWCNTs in refining pore structure and mitigating thermal damage. The findings demonstrate the potential of LEGCs as sustainable, fire-resistant construction materials, offering a low-carbon alternative with enhanced mechanical and durability properties for high-temperature applications.</p>

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Lightweight Engineered Geopolymer Composites with Carbon Nanotubes and Lightweight Aggregates: Enhancing Thermal Resistance and Mechanical Strength

  • 期刊论文

  • 发表日期：

    2025年10月3日

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  • Ali Raza,
  • Nejib Ghazouani,
  • Mohd Ahmed

摘要

This study investigates lightweight engineered geopolymer composites (LEGCs) reinforced with multi-walled carbon nanotubes (MWCNTs) and optimized lightweight aggregates (LWAs) for improved performance under elevated temperatures. LEGCs were developed using industrial byproducts and evaluated for their mechanical strength, dimensional stability, and microstructural integrity after exposure to high thermal conditions. The results showed that moderate heating enhanced matrix densification, while higher temperatures caused microcracking and phase changes. Moderate heating (200°C) enhanced compressive strength by 27.27% due to matrix densification, while severe degradation at 800°C led to strength losses of 135.71%. Incorporating shale-, clay-, and slag-based ceramsite aggregates significantly influenced thermal resistance, with shale-based composites showing comparatively higher stability at extreme temperatures. MWCNTs effectively bridged microcracks and improved structural integrity, contributing to superior strength retention and reduced shrinkage. Microstructural analyses (SEM, XRD, FTIR) confirmed the role of optimized LWAs and MWCNTs in refining pore structure and mitigating thermal damage. The findings demonstrate the potential of LEGCs as sustainable, fire-resistant construction materials, offering a low-carbon alternative with enhanced mechanical and durability properties for high-temperature applications.