Evaluation of hybrid-short-coir-fibre-reinforced composites via full factorial design

Lívia Á. Oliveira, Julio C. Santos, Tulio Panzera, Rodrigo Teixeira Santos Freire, Luciano M. G. Vieira, Fabrizio Scarpa

Research output: Contribution to journalArticle (Academic Journal)peer-review

37 Citations (Scopus)
386 Downloads (Pure)


A full factorial design (2231) has been used to investigate the effect of the use
of sodium hydroxide fibre treatment, Portland cement and uniaxial pressure on the physical and mechanical properties of hybrid short coir fibre reinforced composites (HSCoirFRCs). The response variables considered in this work were the apparent density, porosity, tensile and flexural strength, the modulus of elasticity and the Charpy impact resistance. The alkali treatment contributed not only to reduce the apparent porosity, but also to increase the mechanical properties of the HSCoirFRCs. A reduction of the impact resistance and an increase of the apparent density was also identified after treatment. Cold pressing significantly affected the physical and mechanical properties of the HSCoirFRCs. Higher pressure levels enhanced the wettability of the fibres and, consequently, the mechanical performance of the composites. The incorporation of cement microparticles as a second reinforcement phase was however not effective, leading to decreased strength and an increased apparent density of the materials. The HSCoirFRC structure can be considered an economical and sustainable alternative for future secondary structural parts in lightweight transport applications.
Original languageEnglish
Number of pages11
JournalComposite Structures
Early online date1 Feb 2018
Publication statusE-pub ahead of print - 1 Feb 2018


  • Alkaline treatment
  • Coir fibre
  • Compaction
  • Full factorial design
  • Hybrid composites
  • Portland cement


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