Integrating natural fibres as reinforcement in geopolymer concrete has gained significant attention due to their potential to enhance mechanical properties, especially in increasing tensile strength. This study explores three approaches to incorporating natural fibres into geopolymer matrices to optimize flexural and tensile performance. To test the different configurations and approaches, tiles with 120 \(\,\times \,\) 120x20 mm were used. The first approach employs discrete Miscanthus fibres as dispersed reinforcement. The second investigates the application of natural jute fibre nets in geopolymer concrete tiles, testing two grid types with surface densities of 120 g/m \(^{2}\) and 220 g/m \(^{2}\) in four configurations. The third approach uses 1 mm diameter flax yarns to reinforce geopolymer tiles. Different spaces between the yarns were considered (10mm, 15mm and 20mm). Experimental results reveal that all natural fibre -reinforced configurations enhance flexural strength compared to the unreinforced control mixture. Additionally, the advantages and limitations of each fibre type and configuration are critically analyzed, providing valuable insights into sustainable and high-performance geopolymer concrete design.

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Structural Potential of Natural Fibre Reinforcement in Geopolymers

  • Marianna Coelho,
  • Ivet Todorova,
  • Frank Huijben

摘要

Integrating natural fibres as reinforcement in geopolymer concrete has gained significant attention due to their potential to enhance mechanical properties, especially in increasing tensile strength. This study explores three approaches to incorporating natural fibres into geopolymer matrices to optimize flexural and tensile performance. To test the different configurations and approaches, tiles with 120 \(\,\times \,\) 120x20 mm were used. The first approach employs discrete Miscanthus fibres as dispersed reinforcement. The second investigates the application of natural jute fibre nets in geopolymer concrete tiles, testing two grid types with surface densities of 120 g/m \(^{2}\) and 220 g/m \(^{2}\) in four configurations. The third approach uses 1 mm diameter flax yarns to reinforce geopolymer tiles. Different spaces between the yarns were considered (10mm, 15mm and 20mm). Experimental results reveal that all natural fibre -reinforced configurations enhance flexural strength compared to the unreinforced control mixture. Additionally, the advantages and limitations of each fibre type and configuration are critically analyzed, providing valuable insights into sustainable and high-performance geopolymer concrete design.