Characterization of strength behaviour of model material (sand -bentonite) mixed with fibre
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Date
2017-01
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G.B. Pant University of Agriculture and Technology, Pantnagar (Uttarakhand)
Abstract
One of the major problems faced by geotechnical engineers is to improve the engineering properties of clayey soil. The technique of improving engineering properties of soil is termed as soil stabilization or modification. In present study, sand procured from the bank of River Gaula at Kathgodam, district, Nainital, (Uttarakhand) was mixed with different proportions of sodium bentonite. A number of test were conducted at various percentages bentonite mix with sand such as S100 B0, S95 B5, S90 B10, S85 B15, S80 B20 ,S75 B25, S70 B30, S65 B35 and S60 B40. Physical properties of Gaula sand and bentonite were determined in the laboratory. Specific gravity, optimum moisture content (OMC), maximum dry density (MDD), porosity and void ratio , Atterberg limits, standard proctor test, CBR tests and strength parameters were studied at different proportion of sand bentonite mixes. Unsoaked CBR value increased approximately 100% (more than two times the initial value) for mix S100B0 to S80B20 as the recron-3s fibre mixed randomly from 0.1% to 2.0% by weight of total mix. For mix S75B25 to S60B40 unsoaked CBR value increased about 2.4 to 3.8 times the initial value. Similarly soaked CBR value increased about 2.2 to 3.72 times the initial value when recron-3s fibre mixed randomly from 0.1% to 2.0% by weight of total mix. Shear strength parameters, angle of internal friction and cohesion increased with increasing bentonite proportion in the mixes with and without mixing of recron-3s fibre from 0.1% to 2.0% by weight of total mix. This shows shear strength of the mix increased upon mixing the recron-3s fibre.The addition of recron-3s fibre with black cotton soil can be done resulting improvement of shear strength parameters and CBR values, leading to the economic solution to the pavement constructed on the poor subgrade i.e. like black cotton soil.
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