Geomechanics and Engineering

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Engineering properties of expansive soil treated with polypropylene fibers

  • Ali, Muhammad (Department of Technology, The University of Lahore) ;
  • Aziz, Mubashir (Department of Civil Engineering, National University of Computer and Emerging Sciences) ;
  • Hamza, Muhammad (Department of Technology, The University of Lahore) ;
  • Madni, Muhammad Faizan (Department of Civil Engineering, The University of Lahore)
  • Received : 2020.03.25
  • Accepted : 2020.07.05
  • Published : 2020.08.10
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Abstract

Expansive soils are renowned for their swelling-shrinkage property and these volumetric changes resultantly cause huge damage to civil infrastructures. Likewise, subgrades consisting of expansive soils instigate serviceability failures in pavements across various regions of Pakistan and worldwide. This study presents the use of polypropylene fibers to improve the engineering properties of a local swelling soil. The moisture-density relationship, unconfined compressive strength (UCS) and elastic modulus (E50), California bearing ratio (CBR) and one-dimensional consolidation behavior of the soil treated with 0, 0.2, 0.4, 0.6 and 0.8% fibers have been investigated in this study. It is found that the maximum dry density of reinforced soil slightly decreased by 2.8% due to replacement of heavier soil particles by light-weight fibers and the optimum moisture content remained almost unaffected due to non-absorbent nature of the fibers. A significant improvement has been observed in UCS (an increase of 279%), E50 (an increase of 113.6%) and CBR value (an increase of 94.4% under unsoaked and an increase of 55.6% under soaked conditions) of the soil reinforced with 0.4% fibers, thereby providing a better quality subgrade for the construction of pavements on such soils. Free swell and swell pressure of the soil also significantly reduced (94.4% and 87.9%, respectively) with the addition of 0.8% fibers and eventually converting the medium swelling soil to a low swelling class. Similarly, the compression and rebound indices also reduced by 69.9% and 88%, respectively with fiber inclusion of 0.8%. From the experimental evaluations, it emerges that polypropylene fiber has great potential as a low cost and sustainable stabilizing material for widespread swelling soils.

Keywords

Acknowledgement

The authors are thankful to the Department of Technology, The University of Lahore (UOL), Pakistan for providing the laboratory facilities. We also gratefully acknowledge the Interdisciplinary Research Centre in Biomedical Materials (IRCBM) Department, COMSATS Institute of Information Technology, Lahore, Pakistan for conducting XRD and SEM tests.

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