Particle and aerosol research (한국입자에어로졸학회지)

Korean Association for Particle and Aerosol Research (한국입자에어로졸학회)
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INFLUENCE OF BASALT FIBRES ON THE PROPERTIES OF FLY ASH BASED GEOPOLYMER BINDER

  • Temuujin, J. (Institute of Chemistry and Chemical Technology, Mongolian Academy of Sciences) ;
  • Minjigmaa, A. (Institute of Chemistry and Chemical Technology, Mongolian Academy of Sciences) ;
  • Davaabal, B. (Institute of Chemistry and Chemical Technology, Mongolian Academy of Sciences) ;
  • Darkhijav, B. (Institute of Chemistry and Chemical Technology, Mongolian Academy of Sciences) ;
  • Ruescher, C.H. (Institute of Mineralogy, Leibniz University of Hannover)
  • Received : 2015.08.04
  • Accepted : 2016.06.28
  • Published : 2016.06.30
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Abstract

The influence of basalt fibres on the compressive strength of the geopolymer type binders has been studied. For the experiments 2 types of the basalt fibres were used, namely chopped and spooled fibres. Both types of basalt fibres were 7-10 micron thick in diameter and cut into pieces of 6 mm length. The fibres were mixed with 1% weight to the fly ash powder, followed by the addition of the activator solution (8M NaOH). The pastes obtained were cured at $70^{\circ}C$ for 20 h revealing compact bodies. Compressive strength was measured after 7 days and microstructure observation performed with SEM. The cube bodies ($2{\times}2{\times}2cm$) reveal compressive strength of 47.25(4.03) MPa, while it decreased to 34.0(9.05) MPa in spooled basalt fibres and to 17.33(5.86) MPa in the chopped basalt fibres containing binder, i.e 76% and 36% of the strength without fibres, respectively. The much weaker compressive strength of the chopped fibres containing binder is related to the absence of significant adhesion between the geopolymer binder and the basalt fibres, forming voids instead. Alkali leaching effect of basalt fibres could probably explain the drop in the compressive strength with spooled and chopped fibres, respectively.

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References

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