Stabilization of Subgrade Soil using Lime & Steel Slag

Stabilization of Subgrade Soil using Lime & Steel Slag

Guided By- Prof. Bhor A. S. , Mr. Akshay Sinnarkar , Ms. Snehal Gadhave , Mr. Kishor Chache , Mr. Asutosh Gunjal

CHAPTER 1

INTRODUCTION

• GENERAL

Transport is an integral part of any nation’s economy. Roads are considered to be lifelines of country because it is most preferred and cost effective modes of transportation. Hence, it is essential develop well established and efficient network of roads in the country to provide accessibility in every corner of country in all weather.

The overall performance and durability of pavement majorly depends on its subgrade. Subgrade is an in situ soil which is compacted to its maximum dry density upon which pavement layers are laid. The loads on pavement must be transmitted to subgrade. The roads will rapidly detoriate if subgrade does not possess adequate bearing capacity. The soil in subgrade should not change in volume and resist deformation.

Black cotton soil is crucial material for pavement construction because of its swelling and shrinkage behaviour in varying moisture content. Black cotton soil form major soil group in India. To construct a durable pavement on such kind of road is a challenge to engineers. Due to changing water content in different weather roads on such subgrade results into failures of roads in the form of uneven settlement, heavy depression and cracking. Moreover, softened sub grade has tendency to penetrate upward in adjacent granular layer .Therefore to create subgrade layer the compressibility of such soil need to be reduced i.e. soil need to be stabilize.

The engineering properties of black cotton soil can be increased by adding appropriate admixture in it .In our project we are using steel slag which is by product of metallurgical industry.