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Geomechanics and Engineering
  Volume 12, Number 2, February 2017 , pages 257-267

Improvement in engineering properties of subgrade soil due to stabilization and its effect on pavement response
Prashant P. Nagrale and Atulya P. Patil

    This paper presents laboratory investigation of stabilization of subgrade soil. One type of soil and three types of stabilizers i.e., hydrated lime, class F fly ash and polypropylene fibres are selected in the study. Atterberg limit, compaction, california bearing ratio (CBR), unconfined compressive strength and triaxial shear strength tests are conducted on unstabilized and stabilized soil for varying percentage of stabilizers to analyze the effect of stabilizers on the properties of soil. Vertical compressive strains at the top of unstabilized and stabilized subgrade soil were found out by elasto-plastic finite element analysis using commercial software ANSYS. Strategy for design of optimum pavement section was based on extension in service life (TBR) and reduction in layer thickness (LTR). Extension in service life of stabilized subgrade soil is 6.49, 4.37 and 3.26 times more due to lime, fly ash and fibre stabilization respectively. For a given service life of the pavement, there is considerable reduction in layer thicknesses due to stabilization. It helps in reduction in construction cost of pavement and saving in natural resources as well.
Key Words
    California bearing ratio; stabilization; subgrade; layer thickness reduction; traffic benefit ratio
(1) Prashant P. Nagrale:
Civil Engineering, Sardar Patel College of Engineering, Mumbai, India;
(2) Atulya P. Patil:
Department of Civil Engineering, Sardar Patel College of Engineering, Mumbai, India.

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