Geotechnical behaviour of soils modified with bagasse ash and lime
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Date
2018-08
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G.B. Pant University of Agriculture and Technology, Pantnagar - 263145 (Uttarakhand)
Abstract
India is an agricultural country. Sugarcane is one of the important commercial crops grown in India and supports rural livelihood of about 50 million farmers and 5 lakh workers employed in sugar mills. Mainly, sugarcane is used for sugar production by crushing it in sugar mills. Bagasse produced after extracting juice from sugarcane is used as a fuel in boilers of sugar mill to produce steam and electricity, generating about 9 million tonnes of bagasse ash annually. Accretion and piling up of bagasse ash, demands for its safe and economical disposal. Several researchers have found that these agro industrial wastes have potential to be used as a construction material. Many of the civil engineering projects requires huge volume of earth material, often close-by territories are covered with highly plastic and clayey soil. Increase in global demand for energy and good quality of construction materials constrain engineers to make use of stabilization techniques on the locally available weak soil so as to curtail down the cost of project which could have aroused due to excavation and replacement of inferior soil. Solution to the above problem is to find a material which not only curtail down the cost of traditional stabilizing agents but also it should be easily and abundantly available. Therefore, the present study is an attempt to explore the constructive use of bagasse ash in stabilization of soils. The overall study was conducted in three phases. In the first phase, the geotechnical characteristics of local soil and bagasse ash were studied separately. In the second phase, geotechnical properties of local soil mixed with five different percentages of lime as 0%, 2%, 4%, 6%, and 8% by dry weight of soil were determined by conducting a series of consistency limits test, standard proctor tests, unsoaked and soaked CBR tests and UCS tests. And In third phase, lime treated soil samples were mixed with different percentage of bagasse ash varying as 4%, 10% and 16% and modification in the above stated geotechnical properties of soil was investigated. Local soil was classified as CL according to USCS. Plasticity Index of the lime treated soil mixes were reduced remarkably with the addition of bagasse ash. From the standard compaction test it was concluded that with the addition of lime and bagasse ash, moisture demand of soil got increased while maximum dry density (MDD) got reduced with the introduction of both the additives. Soaked CBR values of virgin soil remarkably improved with the introduction of 6% lime but nearly same CBR value was achieved with addition of 10% bagasse ash in 4% lime treated soil. Thereby, reducing 2% of lime by dry weight of soil. Also, there was a gain in compressive strength with the introduction of bagasse ash into lime treated soil mix. Lastly, the results indicates that the geotechnical properties of problematic soil from Sitarganj can be effectively improved by using 10% to 16% of B.Ash in combination with 4% to 6% of lime by dry weight of the soil.
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