International Research Journal of Engineering and Technology (IRJET)
e-ISSN: 2395-0056
Volume: 07 Issue: 02 | Feb 2020
p-ISSN: 2395-0072
www.irjet.net
Experimental investigation and stabilization of Black Cotton Soil using Micro Silica and Renolith Mr. Nagarjun Gowda B. S.1, Mrs. Shilpa M.S2, Ms. Nidhi.K3 1Assistant
Professor, Department of CTM, Dayananda Sagar College of Engineering, Karnataka, India Professor, Department of CTM, Dayananda Sagar College of Engineering, Karnataka, India 3Student, Department of CTM, Dayananda Sagar College of Engineering, Karnataka, India ----------------------------------------------------------------------***---------------------------------------------------------------------
2Assistant
Abstract - Due to rapid growth of urbanization and industrialization, minimization of industrial waste is serious problem in present days. To encounter this innovation and nontraditional research on waste utilization is gaining now a day. Soil improvement using the waste material like slag, Rice husk ash, silica fume etc. in geotechnical engineering has been recommended from environmental point of view. The main objective of this study is to evaluate the feasibility of using silica fume as soil stabilization material. In this paper the effect of silica fume on engineering characteristics of expansive clay like black cotton soil has been presented. A series of laboratory experimental has been conducted on black cotton soil blended with silica fume content from 5%, 10%, 15% and 20% by weight of dry soil. The experimental result showed a significant increase in California bearing ratio and unconfined compressive strength. Another stabilization material called Renolith is also used in this study. Renolith is a polymer based chemical solution composed of formulated Nano emulsion based styrene acrylic. It is available in a liquid form. The influence of Renolith and micro silica stabilized black cotton soil was investigated to find out the improvement in the compaction characteristics, mechanical strength and shear capacity (i.e., OMC, MDD, CBR and UCC). The obtained result shown an array of improvement over percentage of micro silica kept constant (i.e., 15%) and Renolith varied (i.e. 5%, 7.5%, 10% and 12.5%). There was maximum increase in CBR and UCC values. Key Words: Soil Stabilization, Black Cotton Soil, Micro silica, Renolith 1. INTRODUCTION Sub grade soil is an integral part of the road pavement from beneath. The sub grade soil and its properties are important in the design of pavement structures. The main function of the sub grade is to give support to the pavement. And for this, the sub grade should possess sufficient stability under adverse climate and loading condition. Soil stabilization is a process which improves the physical properties of soil, such as increasing the shear strength, bearing capacity and the resistance to erosion, dust formation, or frost heaving. The stabilization methods used are divided into mechanical, chemical and electro chemical methods. Mechanical methods are those in which compaction or bulk density is increased by dynamic or vibro compaction. Electro
Š 2020, IRJET
|
Impact Factor value: 7.34
|
chemical methods of stabilization involve the reduction of water content by electro osmosis. Chemical stabilization is one of the effective stabilization techniques. 1.1 Black Cotton Soil Black cotton soil is the Indian name given t expansive soil. Expansive soils are those whose volume changes takes place while it comes in contact with water. It expands during rainy season due to intake of water and shrinks during summer season. Expansive soils owe their characteristics to the presence of swelling clay minerals. The main properties of expansive soil are swelling properties like free swell index, swell potential and swelling pressure which directly affect the bearing capacity and strength of foundation lying on such soil. Typical behavior of swell and shrink of expansive soil causes problems like cracks in foundations. Hence it is necessary to improve the properties of such soils to avoid damage of structure. 1.2 Micro Silica and Renolith Silica fume, also known as micro silica, is an amorphous (non-crystalline) polymorph of silicon dioxide, silica. It is an ultrafine powder collected as a by-product of the silicon and ferrosilicon alloy production and consists of spherical particles with an average particle diameter of 150 nm. The main field of application is as pozzolanic material for high performance concrete. Table -1: Properties of Micro Silica Properties Specific Gravity Silica (SiO2) Bulk Density Specific Surface Area
Values 2.20 90% 500-700 Kg/m3 2000 m2/kg
Renolith is a polymer based chemical solution and it is formed by formulated Nano emulsion based on styrene acrylic. It is available in liquid form. Renolith when thoroughly mixed and stabilized with a soil or road pavement materials, cement and water produces an exothermic reaction and forms a polymer which when compacted provides a very dense layer. Renolith was found to be non-toxic to the user as well as to the environment.
ISO 9001:2008 Certified Journal
|
Page 1731