Variation in geotechnical properties of expansive soil by adding jute fibre reinforcement
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Date
2017-07
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G.B. Pant University of Agriculture and Technology, Pantnagar - 263145 (Uttarakhand)
Abstract
Improvement in soil sub grade has always been an area of concern to Road transport and geotechnical engineers. In the case of a road, a weak sub grade results in a greater thickness of pavement layer which increases the cost of pavement construction. To strengthen the subgrade soil, the use of jute fibre is advantageous because they are cheap, easily available, and eco-friendly. Jute fibre mixed randomly with subgrade soil has significant positive impact on the improvement of subgrade characteristics Keeping this in view an experimental study was conducted on locally available soil reinforced with Jute fibre. In this study the soil samples were prepared at its maximum dry density corresponding to the optimum moisture content in the CBR value with and without Jute fibre reinforcement.
The Jute fibre was mixed in 0.25%, 0.50%, 0.75%, 1.00%, 1.25%, 1.50%, 1.75% and 2.00% of dry weight of soil with original soil. In the present investigation the length of fibre was taken as 30 mm. On these mixes of soil various tests of strength properties like Standard Proctor tests, California bearing ratio tests (CBR) and Unconfined compressive strength test, Tri-axial test was performed to analyse the shear parameter cohesion and angle of friction of soil. On addition of increasing percentage of Jute fibre, the OMC indicated increasing trends and MDD indicated decreasing trends continuously. Unsoaked and soaked values of CBR, UCS values and triaxial shear parameter showed an increasing trend with increasing percentages of Jute fibre till 1.25 % fibre content and after this, the value showed a decreasing trend. The economical analysis was done on natural and modified soil sample on the behalf of original CBR value and the optimum value of CBR. Soil mixes with Jute fibre indicates the total 155 mm, crust thickness has been saved. Total saving calculated in the construction of per km of pavement crust is found to be of Rs. 2.77 Lacs, if the pavement is constructed on the modified sub grade instead of natural soil subgrade.that improvement the overall engineering characteristics of the soil.
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