A LABORATORY INVESTIGATION ON THE EFFICIENCY OF EXPANSIVE SOIL TREATED WITH PHOSPHOGYPSUM AND CALCIUM CHLORIDE AS SUBGRADE FOR FLEXIBLE PAVEMENTS
Keywords:
Expansive Soil, Phosphogypsum(PG) , Calcium chloride, Optimum Moisture Content (OMC) & Maximum Dry Density (MDD), CBRAbstract
- Expansive soils are extensively distributed worldwide, it cover approximately one-sixth of the total area of our country mainly in coastal regions and are a source of great damage to infrastructure, buildings and pavements. Most of the time, large areas are covered with highly plastic and expansive soil which is not suitable for the construction purpose. Expansive soils are basically susceptible to detrimental volumetric changes with variations in moisture content due to seasonal variations. Montmorillonite is present in these type of soils due to this the soil exhibits large swelling and shrinkage. Understanding the behaviour of these Expansive soils and adopting suitable methods to overcome the failures in these problematic soils have become a challenging task for geotechnical engineers. The present study deals with the strength behaviour of the expansive soil collected from Relligadda, nearby
Amalapuram, East Godavari district, Andhra Pradesh, India, on adding Phosphogypsum as an admixture and Calcium chloride as a chemical for improving the strength characteristics of the expansive soil. The laboratory tests have been carried out and results were reported in this paper
