Geomechanics and Engineering

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Strengthening of cement blended soft clay with nano-silica particles

  • Thomas, Geethu (Department of Civil Engineering, National Institute of Technology) ;
  • Rangaswamy, Kodi (Department of Civil Engineering, National Institute of Technology)
  • Received : 2019.08.22
  • Accepted : 2020.02.19
  • Published : 2020.03.25
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Abstract

In recent years, Nano-technology significantly invaded the field of Geotechnical engineering, particularly in soil stabilisation techniques. Stabilisation of weak soil is envisioned to modify various soil characteristics by the addition of natural or synthetic materials into the virgin soil. In the present study, laboratory experiments were executed to investigate the influence of nano-silica particles in the consistency limits, compressive strength of the soft clay blended with cement. The results revealed that the high compressibility behaviour of soft clay modified to medium-stiff condition with fewer dosages of cement and nano-silica. The mechanism behind the strength development is verified with the previous researches as well as from Fourier Transform Infrared spectroscopy (FTIR), X-ray diffraction test (XRD) and Scanning Electron Microscopy (SEM) analysis. Based on the results, the presence of nano-silica in soft clay blended with cement has a positive effect on the behaviour of soil. This technique proves to be very economical and less detrimental to the environment.

Keywords

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