Geomechanics and Engineering

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Geotechnical shear behavior of Xanthan Gum biopolymer treated sand from direct shear testing

  • Lee, Sojeong (Geotechnical Engineering Research Institute (GERI), Korea Institute of Civil Engineering and Building Technology (KICT)) ;
  • Chang, Ilhan (School of Engineering and Information Technology, University of New South Wales (UNSW)) ;
  • Chung, Moon-Kyung (Geotechnical Engineering Research Institute (GERI), Korea Institute of Civil Engineering and Building Technology (KICT)) ;
  • Kim, Yunyoung (Inha University) ;
  • Kee, Jong (Hanyang University)
  • Received : 2016.10.14
  • Accepted : 2017.02.14
  • Published : 2017.05.25
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Abstract

Conventional geotechnical engineering soil binders such as ordinary cement or lime have environmental issues in terms of sustainable development. Thus, environmentally friendly materials have attracted considerable interest in modern geotechnical engineering. Microbial biopolymers are being actively developed in order to improve geotechnical engineering properties such as aggregate stability, strength, and hydraulic conductivity of various soil types. This study evaluates the geotechnical engineering shear behavior of sand treated with xanthan gum biopolymer through laboratory direct shear testing. Xanthan gum-sand mixtures with various xanthan gum content (percent to the mass of sand) and gel phases (initial, dried, and re-submerged) were considered. Xanthan gum content of 1.0% sufficiently improves the inter-particle cohesion of cohesionless sands 3.8 times and more (up to 14 times for dried state) than in the untreated (natural) condition, regardless of the xanthan gum gel condition. In general, the strength of xanthan gum-treated sand shows dependency with the rheology and phase of xanthan gum gels in inter-granular pores, which decreases in order as dried (biofilm state), initial (uniform hydrogel), and re-submerged (swollen hydrogel after drying) states. As xanthan gum hydrogels are pseudo-plastic, both inter-particle friction angle and cohesion of xanthan gum-treated sand decrease with water adsorbed swelling at large strain levels. However, for 2% xanthan gum-treated sands, the re-submerged state shows a higher strength than the initial state due to the gradual and non-uniform swelling behavior of highly concentrated biofilms.

Keywords

Acknowledgement

Supported by : National Research Foundation of Korea (NRF)

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