Geomechanics and Engineering

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Strength and durability characteristics of biopolymer-treated desert sand

  • Qureshi, Mohsin U. (Faculty of Engineering, Sohar University) ;
  • Chang, Ilhan (School of Engineering and Information Technology, University of New South Wales (UNSW)) ;
  • Al-Sadarani, Khaloud (Faculty of Engineering, Sohar University)
  • Received : 2016.10.19
  • Accepted : 2017.02.19
  • Published : 2017.05.25
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Abstract

Biopolymer treatment of geomaterials to develop sustainable geotechnical systems is an important step towards the reduction of global warming. The cutting edge technology of biopolymer treatment is not only environment friendly but also has widespread application. This paper presents the strength and slake durability characteristics of biopolymer-treated sand sampled from Al-Sharqia Desert in Oman. The specimens were prepared by mixing sand at various proportions by weight of xanthan gum biopolymer. To make a comparison with conventional methods of ground improvement, cement treated sand specimens were also prepared. To demonstrate the effects of wetting and drying, standard slake durability tests were also conducted on the specimens. According to the results of strength tests, xanthan gum treatment increased the unconfined strength of sand, similar to the strengthening effect of mixing cement in sand. The slake durability test results indicated that the resistance of biopolymer-treated sand to disintegration upon interaction with water is stronger than that of cement treated sand. The percentage of xanthan gum to treat sand is proposed as 2-3% for optimal performance in terms of strength and durability. SEM analysis of biopolymer-treated sand specimens also confirms that the sand particles are linked through the biopolymer, which has increased shear resistance and durability. Results of this study imply xanthan gum biopolymer treatment as an eco-friendly technique to improve the mechanical properties of desert sand. However, the strengthening effect due to the biopolymer treatment of sand can be weakened upon interaction with water.

Keywords

Acknowledgement

Supported by : National Research Foundation of Korea (NRF)

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