Geomechanics and Engineering

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Performance evaluation of β-glucan treated lean clay and efficacy of its choice as a sustainable alternative for ground improvement

  • Kumara, S. Anandha (Centre for Advanced Research on Environment, School of Civil Engineering, SASTRA Deemed University) ;
  • Sujatha, Evangelin Ramani (Centre for Advanced Research on Environment, School of Civil Engineering, SASTRA Deemed University)
  • Received : 2020.01.02
  • Accepted : 2020.04.07
  • Published : 2020.06.10
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Abstract

The choice of eco-friendly materials for ground improvement is a necessary way forward for sustainable development. Adapting naturally available biopolymers will render the process of soil stabilization carbon neutral. An attempt has been made to use β-glucan, a natural biopolymer for the stabilization of lean clay as a sustainable alternative with specific emphasis on comprehending the effect of confining stresses on lean clay through triaxial compression tests. A sequence of laboratory experiments was performed to examine the various physical and mechanical characteristics of β-glucan treated soil (BGTS). Micro-analysis through micrographs were used to understand the strengthening mechanism. Results of the study show that the deviatoric stress of 2% BGTS is 12 times higher than untreated soil (UTS). The micrographs from Scanning Electron Microscopy (SEM) and the results of the Nitrogen-based Brunauer Emmett Teller (N2-BET) analysis confirm the formation of new cementitious fibres and hydrogels within the soil matrix that tends to weld soil particles and reduce the pore spaces leading to an increase in strength. Hydraulic conductivity (HC) and compressibility reduced significantly with the biopolymer content and curing period. Results emphases that β-glucan is an efficient and sustainable alternative to the traditional stabilizers like cement, lime or bitumen.

Keywords

Acknowledgement

This work was supported by the TRR fund [TRR18] from the SASTRA Deemed University, Thanjavur, 613401, Tamil Nadu, India. The authors thank the Vice Chancellor of SASTRA for the support and infrastructure provided during the period of the study. Also, the authors thank the editor and the anonymous reviewers for the effort in improving this manuscript.

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