Abaca fiber as an efficient reinforcement for high mechanical performance in metakaolin-based geopolymers

Ana Carolina Constâncio Trindade, Sai Shruti Sood, Deyvid do Carmo Silva, Ali Ozer, Waltraud M. Kriven

Research output: Contribution to journalArticlepeer-review

Abstract

This study introduces an innovative method for efficiently integrating abaca fibers into a potassium-based geopolymer (KGP) material. Geopolymers often suffer from brittleness, and composite designs have been explored as a solution to enhance their strength and ductility. While synthetic reinforcements are commonly employed due to their consistent properties, natural fibers offer a renewable and eco-friendly alternative. However, their widespread use has been hindered by complex and time-consuming treatments, resulting in variable morphologies that affect fiber-matrix adhesion. It is worth noting that previous research has primarily focused on alkali-activated and cementitious applications, leaving a knowledge gap in understanding its interactions with calcium-free, metakaolin-based geopolymers. Consequently, this study aimed to simplify the conversion of raw abaca into uniformly chopped filaments, facilitating their integration into KGPs at levels of up to 7 wt%. The mechanical evaluation revealed exceptional performance, with compressive strengths reaching up to 45 MPa. A thorough analysis confirmed robust, fiber-matrix adhesion and identified the presence of lignin and cellulose, significantly contributing to the fiber's strength. Flow table tests showcased their versatility, transitioning from high flowability (1 wt%) to complete shape retention (7 wt%). Furthermore, all variations exhibited great ductility, multiple cracking formation, and minimal variability in mechanical properties.

Original languageEnglish (US)
Pages (from-to)1154-1169
Number of pages16
JournalInternational Journal of Applied Ceramic Technology
Volume21
Issue number2
DOIs
StatePublished - Mar 1 2024

Keywords

  • abaca
  • ductility
  • geopolymers
  • graceful failure
  • natural fiber

ASJC Scopus subject areas

  • Ceramics and Composites
  • Condensed Matter Physics
  • Marketing
  • Materials Chemistry

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