International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 06 Issue: 05 | May 2019 www.irjet.net p-ISSN: 2395-0072 © 2019, IRJET | Impact Factor value: 7.211 | ISO 9001:2008 Certified Journal | Page 198 Effect of Lime (Content & Duration) on Strength of Cohesive Soil Shivesh Kumar 1 , Ravi Kumar Mahato 2 , Nikhil Kumar 3 , Nishant Ranjan 4 , Debkumar Mondal 5 , Prof. (Dr.) Subha Sankar Chowdhury 6 1,2,3,4,5 B.Tech, Dept. of Civil Engineering, Heritage Institute of Technology, W.B, India 6 Asst. Professor, Department of Civil Engineering, Heritage Institute of Technology, Kolkata, India ---------------------------------------------------------------------***---------------------------------------------------------------------- Abstract - With the availability of better research, materials and equipment, it is emerging as a popular and cost-effective method for soil improvement. Soil stabilization can be explained as the alteration of the soil properties by chemical or physical means in order to enhance the engineering quality of the soil. The main objectives of the soil stabilization is to increase the bearing capacity of the soil, its resistance to weathering process and soil permeability. The long-term performance of any construction project depends on the soundness of the underlying soils. Unstable soils can create significant problems for pavements or structures, Therefore soil stabilization techniques are necessary to ensure the good stability of soil so that it can successfully sustain the load of the superstructure especially in case of soil which are highly active, also it saves a lot of time and millions of money when compared to the method of cutting out and replacing the unstable soil. This paper deals with the complete analysis of the improvement of soil properties and its stabilization using lime. Key Words: Lime, Soil Classification, UCS, Atterberg limits, OMC, MDD, Bearing Capacity. 1. INTRODUCTION Soil stabilization is a process of improving the engineering properties of soil up to desired values as per requirement. The main objectives of the soil stabilization is to increase the bearing capacity of the soil. Unstable soils can create significant problems for pavements or structures, Therefore soil stabilization techniques are necessary to ensure the good stability of soil so that it can successfully sustain the load of the superstructure especially in case of soil which are highly active, also it saves a lot of time and millions of money when compared to the method of cutting out and replacing the unstable soil. This paper deals with the complete analysis of the improvement of soil properties and its stabilization using lime. Soil-lime has been widely used either as a modifier for clayey soils or as a binder. In several cases both actions of lime may be observed. When clayey soils with high plasticity are treated with lime, the Plasticity index is decreased and the soil becomes friable and easy to be pulverised, having less affinity with water. All these modifications are considered desirable for stabilization work. Lime also imparts some binding action even in granular soils. In fine-grained soils there can also be Pozzolanic action resulting in added strength. When a clay is treated with lime, the various possible reactions are base exchange, coagulation or flocculation, reduction in thickness of water film around clay particles, cementing action and carbonation. Fine clay particles react with lime and get flocculated or aggregated into larger particle groups which are fairly stable even under subsequent soaking. Plastic clay soils tend to agglomerate more than silty and sandy soils. Due to this flocculation; the lime-treated clays indicate a different grain size distribution. The changes in plasticity, characteristics of soil-lime mixture also take place simultaneously; total lime required for the changes depends on several factors including soil type. The maximum dry density of soil-lime mix is decreased by 2 to 3 per cent in terms of untreated soils; however this decrease in dry density with the addition of small proportion of lime does not cause reduction in strength. Soil-lime is quite suitable as sub-base course for high types of pavements and base course for pavements with low traffic. As in the case of soil-cement, soil-lime also cannot be used as a surface course even for light traffic in view of its very poor resistance to abrasion and impact. Soft lime is quite suitable in warm regions; but it is not suitable under freezing temperatures. 2. OBJECTIVE AND SCOPE OF WORK In this paper we have found out the suitable percentage of lime content for stabilizing the soil considering the curing period. Use of lime significantly changes the characteristics of a soil to produce long-term permanent strength and stability, particularly with respect to the action of water and frost. The mineralogical properties of the soils will determine their degree of reactivity with lime and the ultimate strength that the stabilized layers will develop. In general, clayey soils are considered to be good candidates for stabilization. Due to there is a reduction in the volume of voids which reduces the porosity and fills the voids that cannot be eliminated resulting in reduction in the permeability. Also there is an increase in the bonding between grains which result in increase in the mechanical strength of soil.