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This paper presents the mechanical and thermal properties of flax fabric reinforced fly ash based geopolymer composites. Geopolymer composites reinforced with 2.4, 3.0 and 4.1 wt% woven flax fabric in various layers were fabricated using a hand lay-up technique and tested for mechanical properties such as flexural strength, flexural modulus, compressive strength, hardness, and fracture toughness. All mechanical properties were improved by increasing the flax fibre contents, and showed superior mechanical properties over a pure geopolymer matrix. Fourier transform infrared spectroscopy (FTIR) and scanning electron microscopy (SEM) studies were carried out to evaluate the composition and fracture surfaces of geopolymer and geopolymer/flax composites. The thermal behaviour of composites was studied by thermogravimetric analysis (TGA) and the results showed significant degradation of flax fibres at 300 ℃.


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Characterisation of mechanical and thermal properties in flax fabric reinforced geopolymer composites

Show Author's information Hasan ASSAEDIaThamer ALOMAYRIaFaiz U. A. SHAIKHbIt-Meng LOWa,c( )
Department of Imaging & Applied Physics, Curtin University, GPO Box U1987, Perth, WA 6845, Australia
Department of Civil Engineering, Curtin University, GPO Box U1987, Perth, WA 6845, Australia
Department of Engineering, Curtin College, Building 205, Curtin University Bentley Campus, Kent Street, Perth, Western Australia 6102, Australia

Abstract

This paper presents the mechanical and thermal properties of flax fabric reinforced fly ash based geopolymer composites. Geopolymer composites reinforced with 2.4, 3.0 and 4.1 wt% woven flax fabric in various layers were fabricated using a hand lay-up technique and tested for mechanical properties such as flexural strength, flexural modulus, compressive strength, hardness, and fracture toughness. All mechanical properties were improved by increasing the flax fibre contents, and showed superior mechanical properties over a pure geopolymer matrix. Fourier transform infrared spectroscopy (FTIR) and scanning electron microscopy (SEM) studies were carried out to evaluate the composition and fracture surfaces of geopolymer and geopolymer/flax composites. The thermal behaviour of composites was studied by thermogravimetric analysis (TGA) and the results showed significant degradation of flax fibres at 300 ℃.

Keywords:

geopolymer composites, flax fibre, mechanical properties, thermal properties
Received: 19 February 2015 Revised: 17 June 2015 Accepted: 18 June 2015 Published: 25 September 2015 Issue date: April 2015
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Publication history

Received: 19 February 2015
Revised: 17 June 2015
Accepted: 18 June 2015
Published: 25 September 2015
Issue date: April 2015

Copyright

© The author(s) 2015

Acknowledgements

The authors would like to thank Ms. E. Miller from the Department of Applied Physics at Curtin University for her assistance with the SEM. The authors would also thank Mr. Les Vickers of Applied Physics and Mr. Andrew Chan of Chemical Engineering at Curtin University for the help with the TGA.

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