A study on geotechnical properties of soil modified with lime sludge and rice husk ash
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Date
2019-08
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G.B. Pant University of Agriculture and Technology, Pantnagar - 263145 (Uttarakhand)
Abstract
In this study, an attempt has been made to improve the strength characteristics of CL soil by mixing it with lime sludge and rice husk ash (RHA). To achieve this, soil sample was collected from Sitarganj region, Udham Singh Nagar, Uttarakhand from the depth of 500 mm. Lime sludge and RHA are the industrial wastes, contains calcium oxide and silica as their major constituents. The addition of these wastes materials was done in two phases. In the first phase, only lime sludge was blended with the natural soil in various percentages as 4, 8, and 12% and in the second phase rice husk ash was mixed with lime sludge treated soil as 5, 10, 15, and 20%. A series of tests like Atterberg’s limit, standard proctor, unconfined compressive strength (UCS) and california bearing ratio (CBR) were performed on total of 16 combinations which includes soil, soil modified with lime sludge and soil modified with lime sludge and RHA. Scanning electron microscopy (SEM) was also done to observe the
chemical characterization, texture and orientation of soil particles. The tests results showed increase in liquid and plastic limit but decrease in plasticity index with addition of lime sludge and RHA. Standard proctor test results showed increase in optimum moisture content (OMC) but decrease in maximum dry density (MDD) with addition of lime sludge and RHA. The optimum mix was Soil + 8% LS + 10% RHA, at which, CBR increases by 3 and 3.5 times in unsoaked and soaked conditions and UCS increases by 1.33, 2.3, 2.65 and 3.16 times for 0, 7, 14 and 28 days respectively.
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