Paramatic Study of Stabilization on Natural Soil Subgrade Using Sugarcane Bagasse Ash

The development of any country depends on the transportation facilities and the construction projects. Roads are one of the strongest measures of economic activity and the development of any nation. India has a road network of more than 33 lakh km which is the second largest road connecting system in the world. About 65% of freight and 80% of passenger traffic are carried by the roads. Due to massive growth of infrastructure projects, conventional construction materials are diminishing day by day or found short in supply at various locations in the country. The �Pradhan Mantri Gram Sadak Yojna� (PMGSY) is a nationwide plan in Indiato provide good all-weather road connectivity to unconnected villages. This Centrally Sponsored Schemewas introduced in 2000 by the Prime Minister of India Shri Atal Bihari Vajpayee. It is under the authority of the Ministry of Rural Development, Government of India and began on 25 December 2000. It is fully funded by the Central Government.For executing the transportation facilities, the quality of a pavement depends on the strength of its sub-grade soil. The strength of sub-grade is the major parameter for determining the thickness of pavement. In case of pavement the sub-grade must be uniform in terms of geotechnical properties like shear strength, compressibility etc. Pavement construction may be on natural soil which may be Expansive soil, Black cotton soil, clayey soil, organic soil etc. Natural soils, suffer volume change due to moisture content, which causes heaving, cracking and the break-up of the road pavement. Due to this reason Stabilization of these types of soil is necessary, to suppress swelling and increase the strength of the soil. The growing cost of traditional stabilizing agents and the need for the economical utilization of industrial and agricultural wastes for beneficial engineering purposes has prompted an investigation into the stabilizing potential Sugarcane Bagasse Ash in subgrde soil. These Large Quantities of Waste Materials Sugarcane Bagasse Ash e.g. create negative impact on the environment causing air pollution, water pollution, affecting the local eco- system and hence safe disposal of this waste material is required. Utilizing these waste materials as alternative materials for the construction is no doubt a best solution.The objective of this work is to utilize the effectiveness of Sugarcane Bagasse Ash (SCBA) material to enhance the properties of natural soil used for subgrade material in pavement. The laboratory work involved index properties to classify the soil sample. The preliminary investigation of the soil shows that it belongs to A-6 class of soil in the AASHTO soil classification system. Whereas as per IS classification this class are generally of clay with low compressibility (CL).Atterberg limits, compaction, swelling pressure and CBR tests were used to evaluate properties of stabilized soil. The soil was stabilized with Sugarcane Bagasse Ash in stepped concentration of 5%, 10%, 15%, 20%, 25% and 30% by dry weight of the soil individually. All stabilized soil samples were also cured for 96 hours for CBR test in fully saturated condition. The test results indicate that the addition of SCBA enhances the percentage of grain size distribution, but with addition of SCBA till 20% the LL, PL, PI and swelling pressure decreases, while these parameters further increases in this limit beyond i.e. 20% to 30% of SCBA, Specific Gravity and Maximum Dry Density (MDD) decrease with addition of SCBA, for all percentage values, whereas OMC increases in each material. The CBR value increases with addition of SCBA till 20%, the CBR value increases and it decreases with further addition of SCBA beyond 20% to 30% for both soaked and unsoaked condition.