Improvement of Pavement Soil Sub-grade Using Industrial Waste: Cement Kiln Dust & Brick Kiln Dust

Abstract

For performing any kind of Engineering work the primary concern is to have information about the type of soil. India is having clayey soil cover in most of the part, its cover is around 20 to 25% of the surface area of the country. Clayey soil is always known for its behavior of swelling and shrinkage under the moisture content variation, because of which cause severe damage to the structures causing economic loss. Clayey soil is highly unpredictable in nature when it comes in contact with the moisture and it needs either modification or replacement for performing any kind of constructional activity. For pavement construction, engineers are keen to know the engineering properties of soil underlying because subgrade is primarily composed of locally available soil which needs to be strengthen for providing effective base for pavement overlying. Swelling and shrinkage needs to be reduced, subgrade needs to be strengthen by increasing the CBR value of soil. The modification in engineering properties of such soil needs to be done keeping in mind the criteria of strength and cost management. The idea of utilization of waste in soil enhancement is quite popular in today’s scenario. So the modification of soil subgrade by waste material can be done which provide solution to the problem of disposal and is also effective in terms of cost of alteration. In this study the modification of lacking engineering properties of clayey soil is being done by stabilizing the soil with industrial waste such as Cement Kiln Dust (C.K.D) and Brick Kiln Dust (B.K.D). Clayey soil properties are being determined by performing number of experiments. Modification of properties is being observed at varying percentage of CKD (5%, 10%, 15%, 20%, 25%) and the optimum dose of CKD is treated with varying dose of BKD (5%, 10%, 15%, 20%, 25%). Soil samples are further tested for the blend combination of (Soil+ BKD+ CKD) and the modification of the engineering properties are noted. The tests performed are Atterberg Limit, Free Swell Index, Optimum Moisture Content Test and Maximum Dry Density test and California Bearing Test, Unconfined Compressive strength test. The results revealed that the enhancement in the physical state of clayey specimen is being observed, swelling is highly reduced, improvement of CBR value & shear strength is being observed by the addition of (BKD & CKD).