International Journal of Civil Engineering

, Volume 15, Issue 3, pp 401–409 | Cite as

Bio-Enzymatic Stabilization of a Soil Having Poor Engineering Properties

  • G. P. Ganapathy
  • R. Gobinath
  • I. I. Akinwumi
  • S. Kovendiran
  • M. Thangaraj
  • N. Lokesh
  • S. Muhamed Anas
  • R. Arul murugan
  • P. Yogeswaran
  • S. Hema
Research Paper


Soils with poor engineering properties have been a concern to construction engineers because of the need to strike a balance between safety and economy during earthworks construction. This research work investigates the effects of treating a soil having poor geotechnical properties with a bio-enzyme to determine its suitability for use as road pavement layer material. The elemental composition and microstructure of the soil was determined using energy dispersive X-ray spectroscopy and scanning electron microscopy, respectively. The specific gravity, Atterberg limits, compaction, strength and permeability characteristics of the soil was determined for various dosages of the bio-enzyme. The mountain soil is classified as clayey sand and A-2–4, according to unified soil classification and AASHTO classification systems, respectively. With increasing dosage of the bio-enzyme, the plasticity index, maximum dry unit weight and permeability of the soil decreased, while its 28-day California bearing ratio value, unconfined compressive strength and shear strength increased. Consequently, the application of bio-enzyme to the soil improved its plasticity and strength, and reduced its permeability. It, therefore, became more workable and its subgrade quality was improved for use as a road pavement layer material. The stabilized soil can be suitably used for constructing pavement layers of light-trafficked rural (earth) roads, pedestrian walkways and bicycle tracks.


Geotechnical properties Green technology Road construction Soil improvement Sustainability 


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Copyright information

© Iran University of Science and Technology 2016

Authors and Affiliations

  • G. P. Ganapathy
    • 1
  • R. Gobinath
    • 1
    • 2
  • I. I. Akinwumi
    • 3
  • S. Kovendiran
    • 2
  • M. Thangaraj
    • 2
  • N. Lokesh
    • 2
  • S. Muhamed Anas
    • 2
  • R. Arul murugan
    • 2
  • P. Yogeswaran
    • 2
  • S. Hema
    • 2
  1. 1.Centre for Disaster Mitigation and ManagementVIT University, VITVelloreIndia
  2. 2.Department of Civil EngineeringJay Shriram Group of InstitutionsTiruppurIndia
  3. 3.Department of Civil Engineering, College of EngineeringCovenant UniversityOtaNigeria

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