Potassium-Based Geopolymer Composites Reinforced with Chopped Bamboo Fibers

Kaushik Sankar, Ruy A. Sá Ribeiro, Marilene G. Sá Ribeiro, Waltraud M. Kriven, P. Colombo

Research output: Contribution to journalArticlepeer-review


Bamboo is a fast-growing, readily available natural material with tensile specific strength equivalent to that of steel (250–625 MPa/g/cm3). In the pursuit of sustainable construction materials, a composite was made with potassium polysialate siloxo geopolymer as the matrix and randomly oriented chopped bamboo fibers (Guadua angustifolia) from the Amazon region as the reinforcement. Four-point flexural strength testing of the geopolymer composite reinforced with bamboo fibers was carried out according to ASTM standard C78/C78M-10e1. Potassium-based metakaolin geopolymer reinforced with 5 wt% (8 vol%) untreated bamboo fibers yielded 7.5 MPa four-point flexural strength. Scanning electron microscopy and optical microscopy were used to investigate the microstructure. In addition, X-ray diffraction was used to confirm the formation of geopolymer.

Original languageEnglish (US)
Pages (from-to)49-55
Number of pages7
JournalJournal of the American Ceramic Society
Issue number1
StatePublished - Jan 1 2017


  • composites
  • fibers
  • geopolymers
  • kaolinite
  • potassium

ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry


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