International Journal of Recent Technology and Engineering (IJRTE) ISSN: 2277-3878, Volume-8 Issue-2, July 2019 2574 Published By: Blue Eyes Intelligence Engineering & Sciences Publication Retrieval Number: B1834078219/19©BEIESP DOI: 10.35940/ijrte.B1834.078219 Abstract: Stabilization of clay soil has been carried out for improving its engineering properties of soil. To stabilize the clayey soil use Brick Kiln Dust of and waste Coir Fibre, an experiment is conducted to evaluate the properties of soil mixing with 10%, 20% &30% percentage of Brick Kiln Dust and Coir Fibre contents of 0.5%, 0.75% and 1.0% by weight of soil sample and then the tests are performed. Tests conducted for clayey soil mixed with Brick Kiln Dust and Coir Fibre are Liquid Limit, Plastic Limit, Compaction (OMC & MDD), and California Bearing Ratio (CBR). Flexible pavements sections were degined for non-stabilized and stabilized subgrades to be standard axles traffic intensities. The preamble of brick kiln dust and coir fiber is analyzed to improve the features of expansion subgrade materials and other sub-base materials. Also design the thickness of pavement when it is stabilized with optimized brick kiln dust and coir fiber. The results reveal that CBR value increased with increase of Brick Kiln Dust and Coir fibre. The soil stabilization treatment significantly improved the engineering properties of the soil, and reduced the pavement thickness and also cost of the project. Index Terms: Soil stabilization, Brick Kiln Dust, waste Coir Fibre CBR Test, I. INTRODUCTION Clayey soil is made up of very small particles usually consisting of silicates of aluminum and/or iron and magnesium. In clayey soil the flow of water is mostly obstructed, as the clayey soil is known for absorbing water very slowly and retaining it for a long time. The main property of the clayey soil is that it starts to swell up in wet condition and shrinks in dry condition[1]. According to geotechnical engineering, soil stabilization can be defined as the process of improving one or more chemical and mechanical characteristics of the soil which is useful in various engineering applications. The other definition for stabilization of soil can be termed as, the technique of mixing the soil with different stabilizers in suitable amount so as to eliminate any change in volume, Thereby, improving the physical and chemical properties of the soil. The use of stabilizers for soil stabilization is not a new concept; in the past it has been reported to have used different varieties of additive materials too such plant saps, animal dung, natural oils, lime (Khandakerand Hossain, 2011)[2]. Revised Manuscript Received on July 06, 2019. Rizwan Khan, M.E. student, National Institute of Technical Teachers Training and Research, Sector 26, Chandigarh, 160019, Vinod Kumar Sonthwal, Associate Professor, Department of Civil Engineering, National Institute of Technical Teachers Training and Research, Sector 26, Chandigarh, 160019 Another important characteristics of the soil is that it significantly changes its volume with respect to the variation in the content of the water; these phenomena commonly referred to as expansive clay. During monsoon, water absorption is very quick causing it to swell while during summer they shrink due to evaporation of water. Due to this alternating characteristics of swelling and shrinkage, it becomes fatal for different structures which are usually constructed on such expansive soil. Hence immediate solution for the optimization of such clay soil is vital for the safety and to further prevents cracking of the structures. For improvement of such soil, different methods such as modifications or stabilization procedure is performed. In soil stabilization, different admixtures such as lime, fly ash, rice husk, cement, geogrids or goemembranes etc. are used for soil reinforcement. There has also been report of successful implementation of stabilizations used in clay soils using various additives too. One of them is adding brick dust with highly compressive clay soil for enhancing the strength of the soil. Kumar et al.(2016)used brick dust(5%, 10%, 15%, 20%, 25%) blended with lime(3%,6%,9%) as a stabilizing ingredients to stabilize the soil. It was noticed that the admixture is added with soil the values Optimum Moisture Content (OMC) gradually decreased. The maximum reduction of 6% and 25 % in OMC was establish for lime and brick dust respectively. Optimum value was found of maximum dry density and unconfined compressive strength to be at 6% lime & 25 % brick dust. It was concluded that by combining lime and brick dust, there was an effect of maximum improvement in strength properties, as compared to that of using either lime or brick dust individually [3]. Pokale et al. (2015) studied the shear characteristics of the soil by using an admixture of 30% brick dust. When the brick dust was added, the Moisture content and swelling index of black cotton soil starts to decrease but up to a certain limit. It was also observed that, when the soil sample is being replaced with 30% brick dust, an improvement in UCS was obtained [4]. Neha Pundir et al. (2017) conducted an experiment to stabilize the clayey soil and evaluate the properties of soil blending with different percentage of 10%, 20%, 30%, 40% and 50% of Burnt Brick Dust by weight. Various tests were performed for clayey soil and soil, mixed with Burnt Brick Dust, and observed that by mixing the clayey soil with Burnt Brick Dust, the properties of the soil have been improved drastically[5]. Ishfaq Ahmad Lone et al. (2018) had studied that CBR value of the soil can be increased by adding Coir fibre and Fly Ash. With increase in coir fibre contents and fly ash, it resulted in further increase of Soil Stabilization using Brick Kiln Dust and waste Coir Fibre Rizwan Khan, Vinod Kumar Sonthwal